Although this video is a couple years old, my SA-2 just got zapped by a lightning strike. Thank you very much for making this video with very helpful information about the caps and design. At least when I go to the repair shop I have more context than I would have had if I didn’t watch this video. I’m not sure the caps are fried from the lightning strike, but it’s a place to start the discussion, and replacing the smaller caps with a larger capacity design is an excellent suggestion. Thanks again!
It amazes me how much stuff come out of a capacitor when it goes bang! It just goes everywhere. I had one in a stereo that had exploded, so I replaced it (dual caps) I replaced both of them as I figured if one was gone the other wouldn't be far behind, Had to send away for them so I took a photo on my phone to remind me how they were fitted. They arrived and I fitted them as the picture on my phone, I turned on the amp, there was a cracking noise and a cap started to look stressed, so I checked my phone to see if I made a mistake. No, fitted as was before, so I checked the circuit, it looked an odd way they had done it, I came to think one was in the wrong way, so I double checked, no, it was in as the picture on the phone. So I turned it on again just to see the cap start to bulge, so I turned it off. Changed the cap round and it was fine, so I replaced it with the spare (pack of three, they know you only need two but sell you three) so now it leaves me wondering if it had always been in the wrong way? The owner said when he heard it "What did you do, the him on the left channel has gone, it has hummed since new?" Now, was it fitted the wrong way round from new? It ran almost seven years before the amp gave any trouble, the final output transistor on that channel had finally packed in! Each cap was feeding the right or the left but he said the left always had a hum on it. Why didn't he take it back when he bought it? The cap had leaked over the circuit board but had dried up and still worked the wrong way round, but it must have been doing some smoothing. Don't understand how it worked at all. There was a transistor crackling away, but I cooled them and heated them to no avail, told him he would have a problem with the left as there was a transistor on the way out but he was happy and went away home with it. How can it run for for that length of time fitted the wrong way round? Surprised it survived with all the ripple that must have been going through it for so long. Designed in the UK and made and assembled in Taiwan. I only fix things for myself these days, it is just not worth the bother!
Another nice piece of equipment saved from the bin! Your new caps have probably self charged with static electricity and kept it in the dry plastic bag, or may have been tested and kept the charge like you said. Anyway, I've always been taught to discharge these large caps before any handling or testing, and I've seen this phenomenon multiple times. These large filtering caps used to be one of the most expensive part in a power amp or any large power supply, so it's a frequent problem they were effectively choosen close to their limits. Now, you can spend more on postage or time wasted to supply them: a 85V limit is something logic for a 60V DC. 40 years ago, the same cap in 63 V limit could have sustained without problem, but they were generously built for last, and also occupied a far more important volume. I also guess this amp is perhaps 20 years +, as most subwoofer amps are now class D modules, and your larger value caps have a lower diameter than the original ones. The 110V 220V switch is also representative of these problem, and you're probably right with the overvoltage problem. In western Europe, we had both voltages 220 V and 240 V (for UK!). So vintage international equipment designed for western Europe generally had a supplemental tap. As we are now on a 230 V supply voltage, the best choice is 240 V tap, of course detrimental of some watts in power outputs, but way more appropriate to keep circuits healthy.
When I was in high school we used to charge up caps on the variable power supply to about 200 volts and put them away in the desk drawer for the next class to "wake up" the next person to stick their fingers in to pick one up. Or charge it up call out someone's name and when they looked up toss it over at them.
@@abeleski The discharge would not have been across the chest, as the current would have flown locally through the hand from one lead to the other and not to earth as in a mains electrocution. Also unlike mains it would have been relatively brief. Kid tally = 0. Also, with the secondary caps on this amp, I would be more worried about shorting to other components and frying them, then I would be about electrocution.
@@12voltvids Had the same joke played on me , I used to recap arcade monitors , someone thought it would be fun charge a large power supply main filter cap to around 200 V that I just discharged through a resistor 10 mints ago so I had a sense of security handling it , I have been shocked by high energy ignition systems and that hurts but this was more like having a firecracker go off in your hand , as one can guess that person does not work with me anymore
Nice simple fix. Can't think of many reasons I would need a sub amp anymore. Speaking of long lines, tried to go to IKEA today (Canada Day) in Coquitlam, bad idea. Got there and didn't even get outta the car, too many people. Those kinda line ups and crowds do my head in.
I can't think of many reasons to have a sub. My polk towers with the 12" side firing woofers shake the room as it is for movies and my technics sb7000 with the 14" woofers deliver great sound from my little tube amp. My 400 watt sub behind the couch hasn't been plugged in for years. Don't even know if it works any more. Last time I used it I got the state that said "turn that off or you are sleeping in the garage" As to the lines, nope I don't do them either. If I go to a place and there is a line I just keep on driving. The exception was to get these parts because I had made a special trip but if I was just going to get some inventory I would have turned around. That happened to me when restaurants first opened. One of my favorite places had a 4 table limit and i walked in and all 4 tables were taken so it was take out only. Not eating in my car, I went somewhere else. Something that is driving me crazy now is places refusing cash. I walk in place my order and pull out cash. When they say they won't accept I walk out. Not that I don't have a credit card, I just don't like to use it. Don't like to be tracked by big brother. I am probably one of the few that doesn't have a debit card.
Good video as always. Still to watch the big one where you fault find the Amp, but I will as it still interests me these days, fault find, and repair. One of my longest running hobbies, though when you look inside things these days and find a few black things with lots of legs you just think "It is all chips and expensive ones, I don't want anything to do with it, replace one and before you get the chance to check it it is blown again"! I like the older stuff before surface mounted crap came about. Replacing an surface mount chip is a pain. Even using the low temp stuff to get it off it is still a pain soldering it back on again! As for the surface mount caps these days, not got the repair/service manual for it you have no idea what was in the gap as nine time out of ten there is just a skid mark where it shat itself and vaporised. Another hobby going down the tubes!
I hate the new stuff and avoid it. Another thing I am not fond of is working on things that the owner has tried to overhaul and brings in to get it working. I have such a piece now. Owner replaced a head on a tape deck and the new one isn't even making contact with the tape because obviously it wasn't reassembled properly and now they want me to fix. Thing is if I touch, I am married to it so I usually wash my hands of those jobs.
@@12voltvids That is my pet hate, if they have been inside they can go away in sexual jumps. As soon as you look at it it becomes your problem it is not working and you have to fix it. Even if they broke it it is you that couldn't fix it. I just walk away from it. In fact I am at the point I just fix for myself, people think you will sit for hours fixing things and do it for free. So when I moved here I stopped doing anything. Excuse, well I just do not have the room anyway, not even to fix my own stuff.
@@BoB4jjjjs yup. I have worked on stuff for this person before. They are one of these recap people. In this case changed a head on an open reel that I would never have touched as the original had only very slight indication of wear, and it would never have caused any sound trouble but they went ahead and changed it. Wants me to align and the new head isn't even set correctly. They changed out all the alignment screws as well and I don't have the tiny hex keys. As I said I would have refused to change the head because the alignment will never be correct. So I looked at it momentarily and saw the record head isn't making contact with the tape and though to myself this isn't one I want to get involved with. No matter what the charges are, it will never be good enough. Something will always be wrong. Learned this from past experience dealing with audiophools. Shop I worked at the boss was cheap. Would not buy expensive distortion meter and stuff like that. Had one guy come in with something. I forget what it was because the other tech worked on it. A few days later it is back. Other tech checks over and can find nothing wrong. Sends it out, boomerang back again. Still can find nothing wrong sends it back out. Comes back again, this time goes to my bench. Since I am not making a dime on it, I was paid piece work and the other guy was hourly so he gets paid no matter what, but I can't charge so already I have a chip on my shoulder. Again sounded fine for me sent it out again. Guy livid, demanding a tech on site. Boss makes me go because the other guy wasn't the licensed tech I was. I go there. The guy has an hp distortion meter and he is measuring 0.13% and his amp is spec'd out at 0.10. I walked it, saw his setup (looked like Carlson's lab) and said "are you fucking shitting me" and walked out. He got his money back and was told to never set foot in the shop again. Talk about not picking. You will never hear the difference between 0.1 and 0.13 thd, and yet the hours wasted on this. My assistant probably wasted 2 hours and me a good hour or 2 by the time I add the unpaid service call in.
@@12voltvids Yes, not worth it at times. You fix something and it come back, it broke again, totally different fault, But it didn't do it before! Then it strikes you it were 4 month ago you last looked at it, then you find it is played at full volume all the time and the audio is blown. I had one where one person said it were distorted on one channel, couldn't find anything wrong and gave it back, straight back with it, still doing it he said. After wasting about three bloody hours on it, it turned out he had blown his speaker. What an idiot, he didn't offer me anything so I bided my time and he dually appeared with something else and was told I was not even going to look at it. I got all the protests, but I didn't care, i just couldn't be bothered. Anyway, I had plans that night and he wanted it fixed there and then, so he was told to Go Away In Sexual Jumps! Never did look at it even though he pleaded me to look at it. I have a life to lead, or at least I did then.
Great video! I have one of these in the shop right now. But the technician needs a schematic. There is a transistor that he cannot see the value of. Where would I find one?
I hear you about lines, can't stand them either. We're running shy on component retailers in Toronto also and the one I used to love to go to routinely doesn't have the (very common) parts I need. In the end, I just end up ordering from digikey or mouser. Shame, because I really do love to support brick and mortars. That and pandemic shopping is just no fun.
I have a large box with caps from stereo's and other things I stripped for parts, 1uf 50v right up to 15000uf 100volts. I test them on a cap tester and if they are with in 95% ratings I keep them.
I'm surprised that amp lasted as long as it did. Those "dual rail" models were known to fail. NHT makes great speakers, but their electronics were problematic.
In computer electronics, Taiwan is usually decent build quality... PROC China was usually the really iffy stuff. Perhaps it depends on the year. Japanese stuff from the 60's was rough, but they figured it out and got better, becoming one of the best.
I know you like to pop into your local electronic supply store, but Digi-key has all that stuff in stock and it's at your front door in less than 12 hours. $8.00 CDN shipping (under $100 order).
That's still 8.00. Last time I ordered a part from them the shipping was 20.00 because to get the discount I had to order 100 in parts. I can go to the local shop and it costs me 1.20 to charge up my car.
@@12voltvids Are you sure that's DigiKey? Mouser charges $20, but I order a lot of stuff from Digikey and it always costs me $8.00 to London, Ontario. Maybe it's more to BC?
@@ElectoneGuy It was Mouser, digikey is 8, but that is still double what kpcomponents charges. Incidentally the caps I bought 10,000uf 35V are 7.11 at digikey and I pad 7.50 so the price is almost identical.
@@12voltvids I just find that the online stores have better selection. I also like to pop into my local supplier. The guy is barely getting by and Covid nearly killed his business.
@@ElectoneGuy They may have better selection but when it takes longer to navigate the web site to actually find what you are looking for than going to the store and picking it up. I don't order large quantities as I have no need to stock dead inventory. I pick up just what I need for the job at hand because I don't know when the next project is coming in. The work will eventually dry up. One of my regular clients passed away lately so I won't be getting his stuff to service and he brought me a fair bit of work. Eventually the service business will go away completely. I don't want to be stuck with hundreds invested in spare parts when that day comes. When i left the business the shop i was at had about 10,000 in parts inventory that all went in the bin.
You ever think you could do a vid of your set up .. like how you place your cameras what kind of tools yo u use and your workbenches. Always like to see how other people do their work
Happy Canada Day. Maybe 105deg Celsius caps can take it better than the regular ones. But the designer, manufacturer f... (to save money?) in this case - 80V on 60V it's OK, but at the limit you ask for trouble. So H class amp. QSC, pro amps, use it also, so they can get away with less output transistors. At first I thought the outputs are gone after seeing one pair. BTW, the Motorola version of Toshiba 1302/3281 (1943/5200) can take a bit more beating than Toshibas. And then there are newer 17A devices, Onsemi, Fairchild makes it, if ones needs just a bit more juice. I keep the old junk for parts, yes big caps are expensive and I can't get them in the store in Ottawa. I have dbx 120x Subharmonic Synthesizer to send signal to the sub - pretty cool device, that can create some nice rumble in the lowest frequencies. Your new theme music is much nicer 👍 - hopefully no copy rights problems again. Your comment about staying in line reminds me of 1980s Poland, but we had coupons for almost everything. If some desireable product was delivered, automatically line up formed, then people would sell it at profit, kind of like eBay.
It is all musicbakery music I use. The exception is the remix of hocus pocus and as sure as the sun which is just samples and therefore falls under fair use just like all modern music these days.
@@amazoidal Class D seems to be the future. They are now good enough that you can't hear the difference, and you get big power for a very small efficient package that is not a furnace.
I'm retired now but when I repair an amp I usually order from mouser, I usually get them in 5 days or so. Prices are good ($3.54 per for 6800uf 35v Panasonic) and they almost always have good stock. A 50v cap costs about the same here. Do you folks have something like Mouser or Digikey in the north woods?
3.54 us is around 4.90 cdn. So 9.80 for 2. Add 20.00 us freight to get them to Canada and those 2 caps cost about 37.00. Cost me about 20.00 here with tax. I can drive to the store to buy them for about 1.2 in electricity cost to operate my electric car.
@@amazoidal There was the opertunity for someone to buy Main electronics when the owner passed away, and the son didn't want to run the business but nobody stepped forward to buy the building.
Too bad. Maybe the son could have gotten the Canadian equivalent of an SBA loan to buy the building. Here in San Diego, we have some successful "parts" stores that sell to repair shops and enthusiasts. We have lots of electronic nerds here. The two shops I use for repairs are Classic Audio Repair and Mike Zuccaro, "The Audio Craftsman". On the internet.
@@amazoidal The son wouldn't have needed a loan to buy the building, he OWNED the building. There were several businesses in the building. He wanted to sell the building to make his millions from what a commercial building in Vancouver will sell for.The place I buy from now, Lee's used to be in the same building about 4 stores down, and he tried to buy it but no. SO he moved to a bigger shop about 10 blocks away.
I am sorry you got hosed pretty good for those caps. But I also understand the convenience of getting them the same day. (I have the same issue here) Got some 3k hour 105C jobbies for about $6/ea at digikey for a job the other day. I know I can get an 2k 85C for $3/ea, but I rarely put those in anymore.
It's not just the convenience of getting same day, when shipping costs are added and fees to cross the border it costs more to order from digikey. I had to order a tiny belt for my DAT deck once and a belt the size of a dime cost over 30.00 by the time shipping and fees were paid. Make no mistake I will never order something I can go pick up in person because it always costs more to get her. Even from the local guys. They charge 5.00 to ship. Now if I was driving a gas burner it would cost that is fuel, but I drive a plug in. I can do it for 1.20 and that saves me money.
@@worroSfOretsevraH I make nothing. I got 50 for this and for that 20 in parts and 30 labour. Remember 1 hour to drive to shop and back and 45 min in line. Kid flipping burgers makes more than I do fixing stuff. I do this only for the content value. I make much more from the TH-cam advertising than I ever make repairing anything. It is the video that drives the repair business. If the viewers went away and the advertising revenue went away my garage would be spotless and my car back in there so fast. No I wouldn't miss working on electronics. I thought I was out in 2003 when I quit the business. The only reason I returned was because of a single video I did about 9 years ago that was never intended for public screening but was for the owner and a few friends to see. It went viral and within a few months had made about 500 in revenue. TH-cam went ahead without my knowledge and monetized it then reached out to me asking if I was interested in becoming a partner. That was the time I decided to start doing these videos that have become fairly suscesfull.
@@12voltvids At least you can them in Vancouver area, Ottawa electronic parts supplier is a f... joke. I know it's Canada Day, and living in capital I should be happy, but for past years there's more to cry about than celebrate in Ottawa. Our city recent LRT project is a disaster after purchasing rolling stock from Alstom.
Hello sir, I can ask how the defect please manifested itself, unfortunately I do not speak English, thank you ;-) I thought that if the filter conditions are bad, it would not play at all 🧐🤔🤔🤔🤔
I remember when my parents got their first console stereo. It was an Electrohome, and it said solid state. So we all assumed that solid state meant no repairs ever required.
A simple job for a change :-D Well the crapacitors were really buggered and the crappy glue was a ticking bomb :-( Apple sheep, i always thought the people camping outside an apple shop for an over expensive phone are just daft buggers, it's a over hyped and over priced phone. I could never be a mad fan of anything, yes i'm a boring old fart lol.
The shop is in the middle of a block and no place to park out front. (Bus stop) ordering online gets shipped out for a fee. They don't offer online order to pick up because the staff is busy with all the walk up customers.
Some places are mandating using sanitizers to enter...my response? Where is your MSDS sheets according to OSHA requirements. Irrelevant that it is a commercial product...ALL chemicals forced on consumers/employees require MSDS sheets. Voluntary use? No problem, then ."Volenti non fit injuria” ---- “no wrong is done to one who consents,” applies.
Correct. I said ab before I looked closely at the design. Class g and h are still class ab, just with rail switching. I called it envelope modulation as that is what NAD calls it but it is just rail switching. Turning on the higher power rails for the perks of the waveform.
@@12voltvids Yea class H getting its name by the circuitry looking like a H bridge except that its not a H bridge, but yet it functions similar to a class AB.
@@tyronenelson9124 Well, it is a class AB design. The extra transistors only operate as a switch to bump up the voltage so that what would have normally been a clipped waveform remains a nice waveform. Unless you are driving it hard, they operate as a class AB.
Although this video is a couple years old, my SA-2 just got zapped by a lightning strike.
Thank you very much for making this video with very helpful information about the caps and design.
At least when I go to the repair shop I have more context than I would have had if I didn’t watch this video.
I’m not sure the caps are fried from the lightning strike, but it’s a place to start the discussion, and replacing the smaller caps with a larger capacity design is an excellent suggestion.
Thanks again!
It amazes me how much stuff come out of a capacitor when it goes bang! It just goes everywhere. I had one in a stereo that had exploded, so I replaced it (dual caps) I replaced both of them as I figured if one was gone the other wouldn't be far behind, Had to send away for them so I took a photo on my phone to remind me how they were fitted. They arrived and I fitted them as the picture on my phone, I turned on the amp, there was a cracking noise and a cap started to look stressed, so I checked my phone to see if I made a mistake. No, fitted as was before, so I checked the circuit, it looked an odd way they had done it, I came to think one was in the wrong way, so I double checked, no, it was in as the picture on the phone. So I turned it on again just to see the cap start to bulge, so I turned it off. Changed the cap round and it was fine, so I replaced it with the spare (pack of three, they know you only need two but sell you three) so now it leaves me wondering if it had always been in the wrong way? The owner said when he heard it "What did you do, the him on the left channel has gone, it has hummed since new?"
Now, was it fitted the wrong way round from new? It ran almost seven years before the amp gave any trouble, the final output transistor on that channel had finally packed in! Each cap was feeding the right or the left but he said the left always had a hum on it. Why didn't he take it back when he bought it? The cap had leaked over the circuit board but had dried up and still worked the wrong way round, but it must have been doing some smoothing. Don't understand how it worked at all. There was a transistor crackling away, but I cooled them and heated them to no avail, told him he would have a problem with the left as there was a transistor on the way out but he was happy and went away home with it. How can it run for for that length of time fitted the wrong way round? Surprised it survived with all the ripple that must have been going through it for so long. Designed in the UK and made and assembled in Taiwan. I only fix things for myself these days, it is just not worth the bother!
Wow. The only time i have seen one of those large caps fail was in a jvc low profile amp that had poor ventilation. So all the caps got baked.
Another nice piece of equipment saved from the bin!
Your new caps have probably self charged with static electricity and kept it in the dry plastic bag, or may have been tested and kept the charge like you said. Anyway, I've always been taught to discharge these large caps before any handling or testing, and I've seen this phenomenon multiple times. These large filtering caps used to be one of the most expensive part in a power amp or any large power supply, so it's a frequent problem they were effectively choosen close to their limits. Now, you can spend more on postage or time wasted to supply them: a 85V limit is something logic for a 60V DC. 40 years ago, the same cap in 63 V limit could have sustained without problem, but they were generously built for last, and also occupied a far more important volume. I also guess this amp is perhaps 20 years +, as most subwoofer amps are now class D modules, and your larger value caps have a lower diameter than the original ones. The 110V 220V switch is also representative of these problem, and you're probably right with the overvoltage problem. In western Europe, we had both voltages 220 V and 240 V (for UK!). So vintage international equipment designed for western Europe generally had a supplemental tap. As we are now on a 230 V supply voltage, the best choice is 240 V tap, of course detrimental of some watts in power outputs, but way more appropriate to keep circuits healthy.
When I was in high school we used to charge up caps on the variable power supply to about 200 volts and put them away in the desk drawer for the next class to "wake up" the next person to stick their fingers in to pick one up. Or charge it up call out someone's name and when they looked up toss it over at them.
@@abeleski The discharge would not have been across the chest, as the current would have flown locally through the hand from one lead to the other and not to earth as in a mains electrocution. Also unlike mains it would have been relatively brief. Kid tally = 0.
Also, with the secondary caps on this amp, I would be more worried about shorting to other components and frying them, then I would be about electrocution.
You'd likely go to jail if you did that today.
@@12voltvids Had the same joke played on me , I used to recap arcade monitors , someone thought it would be fun charge a large power supply main filter cap to around 200 V that I just discharged through a resistor 10 mints ago so I had a sense of security handling it , I have been shocked by high energy ignition systems and that hurts but this was more like having a firecracker go off in your hand , as one can guess that person does not work with me anymore
I had to put my sound through my Hi-Fi to finally hear the sub, my monitor speakers suck!! Good job fella!
Nice simple fix. Can't think of many reasons I would need a sub amp anymore. Speaking of long lines, tried to go to IKEA today (Canada Day) in Coquitlam, bad idea. Got there and didn't even get outta the car, too many people. Those kinda line ups and crowds do my head in.
I can't think of many reasons to have a sub. My polk towers with the 12" side firing woofers shake the room as it is for movies and my technics sb7000 with the 14" woofers deliver great sound from my little tube amp. My 400 watt sub behind the couch hasn't been plugged in for years. Don't even know if it works any more. Last time I used it I got the state that said "turn that off or you are sleeping in the garage"
As to the lines, nope I don't do them either. If I go to a place and there is a line I just keep on driving. The exception was to get these parts because I had made a special trip but if I was just going to get some inventory I would have turned around. That happened to me when restaurants first opened. One of my favorite places had a 4 table limit and i walked in and all 4 tables were taken so it was take out only. Not eating in my car, I went somewhere else.
Something that is driving me crazy now is places refusing cash. I walk in place my order and pull out cash. When they say they won't accept I walk out. Not that I don't have a credit card, I just don't like to use it. Don't like to be tracked by big brother. I am probably one of the few that doesn't have a debit card.
Good video as always. Still to watch the big one where you fault find the Amp, but I will as it still interests me these days, fault find, and repair. One of my longest running hobbies, though when you look inside things these days and find a few black things with lots of legs you just think "It is all chips and expensive ones, I don't want anything to do with it, replace one and before you get the chance to check it it is blown again"! I like the older stuff before surface mounted crap came about. Replacing an surface mount chip is a pain. Even using the low temp stuff to get it off it is still a pain soldering it back on again! As for the surface mount caps these days, not got the repair/service manual for it you have no idea what was in the gap as nine time out of ten there is just a skid mark where it shat itself and vaporised. Another hobby going down the tubes!
I hate the new stuff and avoid it. Another thing I am not fond of is working on things that the owner has tried to overhaul and brings in to get it working. I have such a piece now. Owner replaced a head on a tape deck and the new one isn't even making contact with the tape because obviously it wasn't reassembled properly and now they want me to fix. Thing is if I touch, I am married to it so I usually wash my hands of those jobs.
@@12voltvids That is my pet hate, if they have been inside they can go away in sexual jumps. As soon as you look at it it becomes your problem it is not working and you have to fix it. Even if they broke it it is you that couldn't fix it. I just walk away from it. In fact I am at the point I just fix for myself, people think you will sit for hours fixing things and do it for free. So when I moved here I stopped doing anything. Excuse, well I just do not have the room anyway, not even to fix my own stuff.
@@BoB4jjjjs yup. I have worked on stuff for this person before. They are one of these recap people. In this case changed a head on an open reel that I would never have touched as the original had only very slight indication of wear, and it would never have caused any sound trouble but they went ahead and changed it. Wants me to align and the new head isn't even set correctly. They changed out all the alignment screws as well and I don't have the tiny hex keys. As I said I would have refused to change the head because the alignment will never be correct. So I looked at it momentarily and saw the record head isn't making contact with the tape and though to myself this isn't one I want to get involved with. No matter what the charges are, it will never be good enough. Something will always be wrong. Learned this from past experience dealing with audiophools. Shop I worked at the boss was cheap. Would not buy expensive distortion meter and stuff like that. Had one guy come in with something. I forget what it was because the other tech worked on it. A few days later it is back. Other tech checks over and can find nothing wrong. Sends it out, boomerang back again. Still can find nothing wrong sends it back out. Comes back again, this time goes to my bench. Since I am not making a dime on it, I was paid piece work and the other guy was hourly so he gets paid no matter what, but I can't charge so already I have a chip on my shoulder. Again sounded fine for me sent it out again. Guy livid, demanding a tech on site. Boss makes me go because the other guy wasn't the licensed tech I was. I go there. The guy has an hp distortion meter and he is measuring 0.13% and his amp is spec'd out at 0.10. I walked it, saw his setup (looked like Carlson's lab) and said "are you fucking shitting me" and walked out. He got his money back and was told to never set foot in the shop again.
Talk about not picking. You will never hear the difference between 0.1 and 0.13 thd, and yet the hours wasted on this. My assistant probably wasted 2 hours and me a good hour or 2 by the time I add the unpaid service call in.
@@12voltvids Yes, not worth it at times. You fix something and it come back, it broke again, totally different fault, But it didn't do it before! Then it strikes you it were 4 month ago you last looked at it, then you find it is played at full volume all the time and the audio is blown. I had one where one person said it were distorted on one channel, couldn't find anything wrong and gave it back, straight back with it, still doing it he said. After wasting about three bloody hours on it, it turned out he had blown his speaker. What an idiot, he didn't offer me anything so I bided my time and he dually appeared with something else and was told I was not even going to look at it. I got all the protests, but I didn't care, i just couldn't be bothered. Anyway, I had plans that night and he wanted it fixed there and then, so he was told to Go Away In Sexual Jumps!
Never did look at it even though he pleaded me to look at it. I have a life to lead, or at least I did then.
@@12voltvids You would never hear it and if he had that amount of equipment he could have fixed it himself!
Thank you, sir. If a capacitor meter like 10,000 micro farad is not available, what should I do for the measurement? Thank you
A quick question i was wondering can the nht sa-2 amplifier handle a 2ohm load if I put a cooling fan on it to keep the amplifier cool
Sir, can we use a headunit without its faceplate ? For example 1din old cd players of kenwood, Pioneer and Alpine.
Happy Canada Day
Great video! I have one of these in the shop right now. But the technician needs a schematic. There is a transistor that he cannot see the value of. Where would I find one?
I hear you about lines, can't stand them either. We're running shy on component retailers in Toronto also and the one I used to love to go to routinely doesn't have the (very common) parts I need. In the end, I just end up ordering from digikey or mouser. Shame, because I really do love to support brick and mortars. That and pandemic shopping is just no fun.
Would it be better to run 40 v's instead??
Do you have a link where you bought that ESR meter
I have a large box with caps from stereo's and other things I stripped for parts, 1uf 50v right up to 15000uf 100volts. I test them on a cap tester and if they are with in 95% ratings I keep them.
I do the same, It saves life and time when you need it suddenly.
I'm surprised that amp lasted as long as it did. Those "dual rail" models were known to fail. NHT makes great speakers, but their electronics were problematic.
In computer electronics, Taiwan is usually decent build quality... PROC China was usually the really iffy stuff. Perhaps it depends on the year. Japanese stuff from the 60's was rough, but they figured it out and got better, becoming one of the best.
I know you like to pop into your local electronic supply store, but Digi-key has all that stuff in stock and it's at your front door in less than 12 hours. $8.00 CDN shipping (under $100 order).
That's still 8.00. Last time I ordered a part from them the shipping was 20.00 because to get the discount I had to order 100 in parts.
I can go to the local shop and it costs me 1.20 to charge up my car.
@@12voltvids Are you sure that's DigiKey? Mouser charges $20, but I order a lot of stuff from Digikey and it always costs me $8.00 to London, Ontario. Maybe it's more to BC?
@@ElectoneGuy It was Mouser, digikey is 8, but that is still double what kpcomponents charges.
Incidentally the caps I bought 10,000uf 35V are 7.11 at digikey and I pad 7.50 so the price is almost identical.
@@12voltvids I just find that the online stores have better selection. I also like to pop into my local supplier. The guy is barely getting by and Covid nearly killed his business.
@@ElectoneGuy
They may have better selection but when it takes longer to navigate the web site to actually find what you are looking for than going to the store and picking it up. I don't order large quantities as I have no need to stock dead inventory. I pick up just what I need for the job at hand because I don't know when the next project is coming in. The work will eventually dry up. One of my regular clients passed away lately so I won't be getting his stuff to service and he brought me a fair bit of work. Eventually the service business will go away completely. I don't want to be stuck with hundreds invested in spare parts when that day comes. When i left the business the shop i was at had about 10,000 in parts inventory that all went in the bin.
You ever think you could do a vid of your set up .. like how you place your cameras what kind of tools yo u use and your workbenches. Always like to see how other people do their work
Well you see my workbench in every video. The camera is handing overhead on a makeshift jib arm.
Happy Canada Day.
Maybe 105deg Celsius caps can take it better than the regular ones. But the designer, manufacturer f... (to save money?) in this case - 80V on 60V it's OK, but at the limit you ask for trouble.
So H class amp. QSC, pro amps, use it also, so they can get away with less output transistors. At first I thought the outputs are gone after seeing one pair. BTW, the Motorola version of Toshiba 1302/3281 (1943/5200) can take a bit more beating than Toshibas. And then there are newer 17A devices, Onsemi, Fairchild makes it, if ones needs just a bit more juice. I keep the old junk for parts, yes big caps are expensive and I can't get them in the store in Ottawa.
I have dbx 120x Subharmonic Synthesizer to send signal to the sub - pretty cool device, that can create some nice rumble in the lowest frequencies.
Your new theme music is much nicer 👍 - hopefully no copy rights problems again.
Your comment about staying in line reminds me of 1980s Poland, but we had coupons for almost everything. If some desireable product was delivered, automatically line up formed, then people would sell it at profit, kind of like eBay.
The originals were 105c in case you missed it.
It is all musicbakery music I use. The exception is the remix of hocus pocus and as sure as the sun which is just samples and therefore falls under fair use just like all modern music these days.
Emotiva is using a Class H design with a switching power supply on it's big amps.Why not just do Class D.?
@@amazoidal Class D seems to be the future. They are now good enough that you can't hear the difference, and you get big power for a very small efficient package that is not a furnace.
Yes, I have a Parasound 2350, similar to many Class D that use the B&O ICE chips. I think it's 350wpc at 8 ohms and 600wpc at 4 ohms. Runs cool.
I'm retired now but when I repair an amp I usually order from mouser, I usually get them in 5 days or so. Prices are good ($3.54 per for 6800uf 35v Panasonic) and they almost always have good stock. A 50v cap costs about the same here.
Do you folks have something like Mouser or Digikey in the north woods?
3.54 us is around 4.90 cdn. So 9.80 for 2. Add 20.00 us freight to get them to Canada and those 2 caps cost about 37.00. Cost me about 20.00 here with tax. I can drive to the store to buy them for about 1.2 in electricity cost to operate my electric car.
Sounds like someone should start an electronics supply shop near you instead of Vancouver proper.
@@amazoidal There was the opertunity for someone to buy Main electronics when the owner passed away, and the son didn't want to run the business but nobody stepped forward to buy the building.
Too bad. Maybe the son could have gotten the Canadian equivalent of an SBA loan to buy the building. Here in San Diego, we have some successful "parts" stores that sell to repair shops and enthusiasts. We have lots of electronic nerds here. The two shops I use for repairs are Classic Audio Repair and Mike Zuccaro, "The Audio Craftsman". On the internet.
@@amazoidal
The son wouldn't have needed a loan to buy the building, he OWNED the building. There were several businesses in the building. He wanted to sell the building to make his millions from what a commercial building in Vancouver will sell for.The place I buy from now, Lee's used to be in the same building about 4 stores down, and he tried to buy it but no. SO he moved to a bigger shop about 10 blocks away.
I am sorry you got hosed pretty good for those caps. But I also understand the convenience of getting them the same day. (I have the same issue here)
Got some 3k hour 105C jobbies for about $6/ea at digikey for a job the other day. I know I can get an 2k 85C for $3/ea, but I rarely put those in anymore.
It's not just the convenience of getting same day, when shipping costs are added and fees to cross the border it costs more to order from digikey. I had to order a tiny belt for my DAT deck once and a belt the size of a dime cost over 30.00 by the time shipping and fees were paid. Make no mistake I will never order something I can go pick up in person because it always costs more to get her. Even from the local guys. They charge 5.00 to ship. Now if I was driving a gas burner it would cost that is fuel, but I drive a plug in. I can do it for 1.20 and that saves me money.
I didn't get "hosed" I just pass the cost along to the client.
How do you calculate your repair costs? Would be nice to hear from someone with experience. I never really know how much to ask for a repair.
@@worroSfOretsevraH
I make nothing. I got 50 for this and for that 20 in parts and 30 labour. Remember 1 hour to drive to shop and back and 45 min in line. Kid flipping burgers makes more than I do fixing stuff. I do this only for the content value. I make much more from the TH-cam advertising than I ever make repairing anything. It is the video that drives the repair business. If the viewers went away and the advertising revenue went away my garage would be spotless and my car back in there so fast. No I wouldn't miss working on electronics. I thought I was out in 2003 when I quit the business. The only reason I returned was because of a single video I did about 9 years ago that was never intended for public screening but was for the owner and a few friends to see. It went viral and within a few months had made about 500 in revenue. TH-cam went ahead without my knowledge and monetized it then reached out to me asking if I was interested in becoming a partner. That was the time I decided to start doing these videos that have become fairly suscesfull.
Great job. There must be other people who needed parts for their elections too.
That's what happens when there is only one parts store left.
@@12voltvids
At least you can them in Vancouver area, Ottawa electronic parts supplier is a f... joke. I know it's Canada Day, and living in capital I should be happy, but for past years there's more to cry about than celebrate in Ottawa. Our city recent LRT project is a disaster after purchasing rolling stock from Alstom.
Hello sir, I can ask how the defect please manifested itself, unfortunately I do not speak English, thank you ;-) I thought that if the filter conditions are bad, it would not play at all 🧐🤔🤔🤔🤔
cool 👍
The hour you spent in line counts as billable work.
Dam right
i think the cat in the intro , is hungry.👈😒👺👀👀👀
I remember when my parents got their first console stereo. It was an Electrohome, and it said solid state. So we all assumed that solid state meant no repairs ever required.
A simple job for a change :-D
Well the crapacitors were really buggered and the crappy glue was a ticking bomb :-(
Apple sheep, i always thought the people camping outside an apple shop for an over expensive phone are just daft buggers, it's a over hyped and over priced phone.
I could never be a mad fan of anything, yes i'm a boring old fart lol.
How do you milk sheep? Bring out a new iPhone and charge a thousand (UK) pounds for it!
They need to have a drive up window or curbside service. Order in advance.
The shop is in the middle of a block and no place to park out front. (Bus stop) ordering online gets shipped out for a fee. They don't offer online order to pick up because the staff is busy with all the walk up customers.
looks like they put a car amp in a home box
Some places are mandating using sanitizers to enter...my response? Where is your MSDS sheets according to OSHA requirements. Irrelevant that it is a commercial product...ALL chemicals forced on consumers/employees require MSDS sheets. Voluntary use? No problem, then ."Volenti non fit injuria” ---- “no wrong is done to one who consents,” applies.
It is Class H then not Class AB.
Correct. I said ab before I looked closely at the design.
Class g and h are still class ab, just with rail switching. I called it envelope modulation as that is what NAD calls it but it is just rail switching. Turning on the higher power rails for the perks of the waveform.
@@12voltvids Yea class H getting its name by the circuitry looking like a H bridge except that its not a H bridge, but yet it functions similar to a class AB.
@@tyronenelson9124
Well, it is a class AB design. The extra transistors only operate as a switch to bump up the voltage so that what would have normally been a clipped waveform remains a nice waveform. Unless you are driving it hard, they operate as a class AB.
I wouldn't start up such an amplifier without changing the smoothing caps.... (and removing de crud)
Actually the popped caps charge up quite nicely.