I agree with you about making a good mechanical connection when replacing components. There are 2 people on TH-cam that restore old radios and both of them just lay parts together and solder the leads together. I watched one of them the other night and was surprised when he said " I hate a half a** job" yet he just laid the electrolytic capacitor leads together and applied a small amount of solder!!!!
Which channels?? It wasn't banderson or radiotvphononut was it?? Banderson has some pretty neat videos I like his series on fixing the philco predicta televisions! I had the opportunity to buy a pedestal predicta set about 6-7 years ago for $75 locally on Craigslist, before they really "took off" with the crazy prices on the internet ruining local prices offline... but i didn't really have the room for it and I have been kicking myself ever since, definitely should've made the room, now that set is worth like $250-500 unrestored...
I used to work for a company that built prototype automated production machines to build detonators for the explosives industry. There was a lot of wiring in those machines and it was all done by parallel soldering. That's what they required., and they inspected every connection.
I just got a Silvertone AM/SW set to check out. The wooden case is polished and beautiful. The unshielded tubes are shiny, as if cleaned with windex. I'm going to fabricate a light bulb current limiter and check it out. Thanks for sharing your technical experience to give me the confidence to try to power this puppy up safely. I think the 12SA7 circuit in the AA5 (this isn't) is pure RF voodoo, a heptode as an mixer/amp with three inputs. Imagine that! 73, JR.
We tune at low frequency with the iron core, at high frequency with the trimmer capacitor. The power amplifier tube is damaged without anode voltage. The auxiliary grille heats up and the pipe becomes gaseous.
Yes, but this kind of radios (AA5) doesn't have a tunable iron core at the oscillator / antenna coil. Just the tunable capacitor for the high end of the frequency.
That dissonance you hear with the sig generator is similar to how they tune pipe organs. They take a rank of pipes and tune another set of pipes to that rank, they adjust the tuning slide or stopper until the dissonance or warble is gone.
Good video, good result ! Like your works so much ! I would set the oscillator quite for if-alignment. Then the trimmers for osc. and input-resonant circuit is only to align on high band, on low band the coil (osc. and input) has to be aligned.
Absolutely sage advice, always change the grid coupling cap on between the AF amplifier and the output valve. I'm sick of telling people not to run old radio's they found, they say "well it's working" then when it fails in a few weeks and they're into a new output valve and if real unlucky an output transformer and even a rectifier. All for the want of a part worth a couple of cents....
In my country bendix refers to the gear attaching mechanism, that bootstraps the starter motor in the car (after the engine spins, it retracts the starter gear back). I wonder if it has anything to do with the bendix of the AA5 radio.
Same manufacturer, from back in the day. They made everything from radios to farm equipment. Still companies like that, FMC makes everything from jetways to chemicals and farm equipment, lol...
@@ccronn Bendix must have been the first with those starter motors, because we just call them "bendix" as if it was a noun. Same way we call the bicycle -"rover" (first english suplier) and the vcacum cleaner is "electrolux" in the common language here.
They were into aircraft. They were into automotive parts. They were into electronics. Etc, etc, etc. Just a multi diversified company, like say GE, or Westinghouse.
16:51 That's pretty much the way most modern surface-mount parts are attached, though they are a little better protected from external forces. And, I assume the lead-free solder is a little less likely to melt if the thing overheats.
Oooh Glad comments are back! Re. wiring and slapping solder on two adjacent leads. Yes, that is useless. But I also hate working on stuff where someone has made 'a good mechanical connection' and so good that one end of a resistor takes the LockPicking Lawyer twenty minutes to open. I say use common sense and build it like the makers did. Clean off old solder and reveal a clean mounting hole and a J hook through said mounting hole with a nice clean joint that looks nice. There should be no need to do a 'mid air' knot anywhere...and it's easier to service in twenty years. That technique is military spec.
Nice repair! I was surprised you took on a unit that’s already been worked on. I guess nothing is factory fresh after 75 years, though. I guess it’s a Not-Quite-All-American 5 now that it has a Japanese audio transformer...
I admit it, I solder things like that. The difference is I'm doing it for "temporary" work so being able to get the components back out easily is more important than longevity.
You need to build an anti-NSA double-wall Faraday cage room for all your test equipment so you can do you your alignments in peace. I worked in a pulsed- power electronics laboratory in college, and they had a half dozen of these beautiful Faraday cages in various lab rooms to keep the experiments from interfering with the test equipment. Really great places to hang out if you were trying to avoid calls on your cellphone. "Sorry love, I was in the Faraday cage all day..." The bum...bum...bum sound is called a tuning beat.
The cages were built like a full screen porch, where the screens were coarse copper wire cloth on top of fine copper wire cloth, with all the structural members wrapped in solid copper sheet. There were two layers of the cloth soldered between the structural members, with each layer spaced a certain distance apart so that a standing wave has a hard time getting through both, as the spacing is not compatible with the wavelength at lambda x 0.5, 1.0, etc.... The floor was elevated and shielded too. The whole thing was earth-grounded.
32:50 Reminds me of people who get the front wheels realigned just because the previous owner put the steering wheel back one-tooth-off-center, or replace a clock movement because the hour hand got bumped half an inch. The obvious things are sometimes the easiest to overlook.
oh nice. i have a 1948 variant of one of these (different model but still Bendix) and it has AM and FM bands. sadly the filter caps are gone and such so it buzzes badly so i don't ever use it. but all of the tubes are 100% original none were replaced and look good the case has no scratches or any kind of damage it looks almost new. so it most likely used once in awhile but mostly sat around. i wish i can restore it but... think the wire mess looks bad here.. never seen anything yet on that unit..
About at 2:20 there is quite the old radial engine airplane climbing out! I would have been very excited and been distracted trying to find it in the sky
@@mattdavala3790 i'm going to go with the Valves from the cargo load with a whistle tone dropping lower and lower as it gets closer to the ground as shango66 looks up and thinks to him self " you know the closer it gets the more it looks like a Piano " lol
Wonder what those who built the radio in 1946 would think of it sounding so good in 2021 (or about the digital test equipment that was used to align it)? Great video.
17:18 the only reason to 'glue' it in place like that, is when you need to hold the component in place so you can solder the connection on the other side properly. Ideally you prevent any mechanical tension on the leads too. I like tacking it in place and afterwards bending the leads correctly around whatever i'm soldering to. Then, with the thing in place, solder properly. HOWEVER. For a little diy project, that crappy soldering job is fine. Sometimes you just make something that is not meant to last for decades, like a radio.
Never live-swap tubes in a mid-century Zenith Transoceanic. The 9 volt filament circuit will rise above 100 volts with a tube removed, blowing the weakest tube in the string when a tube is plugged back in.
My 526 just needed PS filter cap. Totally original, very good performance. Used daily. After 20 to 30 minutes warmup the frequency shifts just enough to need a tiny centering adjustment, then stays there. The audio is excellent. Dial lamp (#47) is designed into the rectifier circuit, needs to be installed. Explanation here. www.nutsvolts.com/questions-and-answers/not-just-for-looks
Thanks for the good advice. That shit's going to fail horribly if it ever does. I recall wiring something like that but it was low current. From now on I won't do it even if it felt safe because it gets copied.
In a noisy environment disconnect the aerial or put the oscillator out of action - if the Oscillator Mixer valve has a separate triode in it then disconnect the anode to this section. And who the heck listens to Classical Music on AM..... again here changing all the capacitors would not cure this radio as you found it. What do you say to that Jason Cruz?
I really love what you're saying about the quality of work here. You know, those YT videos with "projects for quarantine" is something that will never leave the desk in one piece, or in a box as a finished device. You can consider it as a test mock-up. And who's building a mock-up as a rock-solid tank? :) Just for picking a little bit: 15:12 poor old japanese transformer was waiting like a good 50 years to become the protagonist of the show, and then... you damage the bobbin immediately after your MIL-SPEC mechanical fixing :)Bummer... :)
21:03 Disabling local oscillator would be standard operating procedure at this point, correct? Shorted loop of wire aroung loopstick or wire antenna on back cover. Or, I'm not sure if this is correctright ground oscillator lead at variable tuning capacitor. Good information for me on the audio output section. Single ended class A operation so there would be nominal base level of current flow through output transformer. I never measured or thought about it. Beat oscillation, beating, beat frequency. Happy New Year and God Bless!
Yes! It's a good day, more videos from Shango! Is there going to be a part 3 to the admiral console?? I'm really interested to see how that tv turns out!
You could build a screen room to protect against RF signals, but it wouldn't stop airplane noises. I guess you need a screen room within a soundproof room. Also it has to be big enough for your video studio. That will cost a lot of Rubles.
The old books suggest a metal box much like an old bread box. It can be open on one side. They say to ground the box and use a power line filter as well. I've never tried it myself, but I think I will someday because I want to try and test bandwidth and sensitivity.
Yeah, I just saw that. Sat. night disco is still on. Found the stream URL. www.radiosure.com/rsdbms/details.php?id=173846 It's on an HD subchannel in LA.
Maybe the open audio output transtubulator needs marinating in BBQ sauce for an hour or so at 300 degrees. Throw in the oversized .22uF capacitor and baste with more BBQ sauce. Yummy.
Isn't what ruined the output transformer DC bias? New to the valve / tube world, but I know DC will not go through a transformer. It just saturates it turning it into an electromagnet. NOTE: I'd love to see a 12 volt stereo tube amplifier build one day (even if it is only 30 something watts with 6L6's or 12AX7's). Also, 22 watts initially, shouldn't this be requiring something 100 watts at least?
The DC B+ runs through the audio output transformer... they have a current rating before saturation of the core (which is often why higher output power transformers have a physically larger core, but that is another topic.) What Shango said is most likely correct. Grid leakage is the common term but it can also be called grid emission, what usually happens is material from the hot cathode contaminates the grid which causes it to emit electrons too, this causes the tubes plate current to rise, which makes the tube run hotter, which causes more grid emission and so on and so on until something blows up. The plate for the tube is fed from the transformer so most likely pulled too much current through the transformer and cooked it alive.
@@n2n8sda Like Lithium ion batteries from my generation, they had issues with thermal runaway in the valve era. People can clearly learn a lot on TH-cam, if they know what to search for. Big hugz from Fukuoka Kyushu. Thank you muches.
Also in reply to your question about power consumption.. 20 - 30 watts seems about right. I have a pilot 502 next to me and looking at the tube chart sticker in the radio it is rated for 31 watts power consumption. the 50L6GT (basically a higher voltage 6v6) is only rated to a maximum of about 4 watts... and a 12 volt radio with 30 watts of output (something like a 6L6 as mentioned) is totally unfeasible.. you'd need to pull 10+ amps from the 12V source, which if DC would need to be stepped up to run the HV plates of the tubes, a push pull 6L6 might have anything upto 450v on the plates.
@@n2n8sda I completely understand, a 12 volt DC tube amp would definitely not be efficient, but would still sound "warm", right? I would not build it to save power, but these cheezy stereo tube headphone amps are a joke. 1 watt. Really LOL [Edit: yes I know valves have grid voltages into the hundreds, but my concern would be the DC to DC converter to create that voltage introducing any kind of hum into the mix]
Hey @shango066, you should do a 50k subscriber EOL spectacular clip show special with a very special EOL thrown in at the end. Complete with CCP fireworks too!
19:24 Shango! Tells away You get a good job with fancy J-hook and you're okay Solder It's a gas Grab that J-hook with both hands and make a advance New joint, connection, buys a new output transformer to show..
Do not use Japanese output transformer. All singers will sound like Yoko Ono. Did you hear about the Audiofool who tunes all his 300B and 211 amplifiers to only sound good with organ music.
"This is wrong"...hehehe...solder connections in space. Maybe the guy building that thing didn't expect the device to last very long, anyway...if you know what I mean...
He wasn't even tinning both sides before blobbing them together: not even half assed. It looked like his goal was cosmetic instead of functional or durable. One overheated FET and that mess falls apart.
At 16:14 we see a TH-camr who actually thinks tack soldering is perfectly fine. Kids today are lazy ,that's all. Someone should tell them, oh wait I left a comment there about "j-hooking" two leads ( mechanical connection) and then soldering the connection. Lead free solder will easily crack if subjected to pulling on the joint.
Shango: Bitches at commenters telling him he's doing things wrong. Also Shango: Bitches at other channels for doing things wrong (and making more money). Though, to be fair, there are degrees of wrongness.
@@5roundsrapid263 I have been told I am worth my weight (54kg XD) in silver at sound checks. Volume up, feedback .... "that is 420ish Hz" , eq that frequency down, repeat. I guess I am helpful, they pay me well LOL
@@MikinessAnalog the most musical example of which IMHO, is a go fast boat with at least twin engines at speed. Nothing like a pair of V8’s harmonizing while burning gallons of gas in compensation for the captain’s shortcomings. 😉😆
![Electronic Circuitry Diagnosis And Fault Finding! [Repair]](http://i.ytimg.com/vi/LC7OjuYAOQE/mqdefault.jpg)
![ตีสิบเดย์ [FULL] | นางเอกหมอลำเงินล้าน "อุ๋งอิ๋ง เพชรบ้านแพง" & ไฮโซสาวสุดฮอต "ลิลลี่ เหงียน"](http://i.ytimg.com/vi/jPxQS_EgrJ4/mqdefault.jpg)
32:38 . . . "It's all a compromise, you know."
Shango's incredible words of wisdom the entire planet could use.
Borrowing a phrase from Petula Clark's "take of your clothes" song.
More like a Mexican standoff.
Just needs a new tube and it's ready for another 75 years of service!
Shango is the AA5 radio whisperer!
Another great logical diagnostic vid enjoyed all the way from NewZealand
That was a JJ Special for sure. Fully recapped and nothing else.
I agree with you about making a good mechanical connection when replacing components. There are 2 people on TH-cam that restore old radios and both of them just lay parts together and solder the leads together. I watched one of them the other night and was surprised when he said " I hate a half a** job" yet he just laid the electrolytic capacitor leads together and applied a small amount of solder!!!!
Which channels?? It wasn't banderson or radiotvphononut was it?? Banderson has some pretty neat videos I like his series on fixing the philco predicta televisions! I had the opportunity to buy a pedestal predicta set about 6-7 years ago for $75 locally on Craigslist, before they really "took off" with the crazy prices on the internet ruining local prices offline... but i didn't really have the room for it and I have been kicking myself ever since, definitely should've made the room, now that set is worth like $250-500 unrestored...
I used to work for a company that built prototype automated production machines to build detonators for the explosives industry. There was a lot of wiring in those machines and it was all done by parallel soldering. That's what they required., and they inspected every connection.
Sweer repair, Done the proper way soldering. Great educational video, Thank you.👍
I really enjoy that you work on a range of vintage equipment it’s always a nice surprise to see a new video come out. Thanks best regards Chris
For a second, it looked like you were working in the snow. Then my coffee kicked in.
Glad to see a AA5 on your bench.
I'm going to start collecting old NOX sensors from work for the Teflon coating, never thought of that. Thanks for the tip!
Am your biggest fan been watching you for years man love you brother keep up the good work
Great educational video wish i had that many am stations in my area. We are lucky to have three stations on am on a good day. Thank you
I just got a Silvertone AM/SW set to check out. The wooden case is polished and beautiful. The unshielded tubes are shiny, as if cleaned with windex. I'm going to fabricate a light bulb current limiter and check it out. Thanks for sharing your technical experience to give me the confidence to try to power this puppy up safely. I think the 12SA7 circuit in the AA5 (this isn't) is pure RF voodoo, a heptode as an mixer/amp with three inputs. Imagine that! 73, JR.
Excelente reparación.
Un Saludo desde Cuba.
We tune at low frequency with the iron core, at high frequency with the trimmer capacitor.
The power amplifier tube is damaged without anode voltage. The auxiliary grille heats up and the pipe becomes gaseous.
Yes, but this kind of radios (AA5) doesn't have a tunable iron core at the oscillator / antenna coil. Just the tunable capacitor for the high end of the frequency.
Fried screen grid, yum.
Reduced performance certainly was an understatement! An O/C audio output tx would tend to reduce it to nothing :-)
Nice job shango 👍
I noticed the joker soldering the mosfets was using appropriate static precautions. ho ho. Happy new year.
He probably was using an ungrounded soldering iron also.
15:00 Thanks for defending my J-hooks. In some devices, it's a ROYAL pain to get things off the tube sockets, so I use J-hooks frequently.
and you can sometimes screw up the socket or whatever if you insist on doing it. nothing wrong with a j hook
Alright shango, I’ve had a few drinks so I feel I can say it: I love ya! Your videos make me happy. All the best!
Tell the owner to replace the pilot lamp. Not doing so will shorten the life of the 35Z5 rectifier.
Yep. I bought the same chassis a while back. The rectifier was totally wasted because the pilot was burnt out.
Good to know. I have one that just works -- with original lamp.
That dissonance you hear with the sig generator is similar to how they tune pipe organs. They take a rank of pipes and tune another set of pipes to that rank, they adjust the tuning slide or stopper until the dissonance or warble is gone.
addicted to this. nice video!!!!
Good video, good result ! Like your works so much !
I would set the oscillator quite for if-alignment. Then the trimmers for osc. and input-resonant circuit is only to align on high band, on low band the coil (osc. and input) has to be aligned.
Everything good is going away. Great video!
Thanks for calling out the prevalent trend of "touch soldering"
You can quote me on 'touch soldering"
I've just watched the shampoo66 video, very impressed.
28:20 the difference between the tone signal and the station signal in Hz gives the harmonization frequency that's heard, also in Hz.
Sounds like old school pre-cellular mobile phone service in the background
Darn fine diagnosis and alignment work sir.
Absolutely sage advice, always change the grid coupling cap on between the AF amplifier and the output valve. I'm sick of telling people not to run old radio's they found, they say "well it's working" then when it fails in a few weeks and they're into a new output valve and if real unlucky an output transformer and even a rectifier. All for the want of a part worth a couple of cents....
In my country bendix refers to the gear attaching mechanism, that bootstraps the starter motor in the car (after the engine spins, it retracts the starter gear back). I wonder if it has anything to do with the bendix of the AA5 radio.
Same manufacturer, from back in the day. They made everything from radios to farm equipment. Still companies like that, FMC makes everything from jetways to chemicals and farm equipment, lol...
@@ccronn Bendix must have been the first with those starter motors, because we just call them "bendix" as if it was a noun. Same way we call the bicycle -"rover" (first english suplier) and the vcacum cleaner is "electrolux" in the common language here.
@@piwex69 Angle grinder is Flex here in Hungary...
They were into aircraft. They were into automotive parts. They were into electronics. Etc, etc, etc.
Just a multi diversified company, like say GE, or Westinghouse.
mrnmrn1 angle grinder = "diax" in Poland, probably another early producer.
Well hey, one's gotta love a vintage radio that can tune the extended AM band!
Does anyone else listen to shango066 reruns while doing chores?
Luv you man!!! always making me laugh.
16:51 That's pretty much the way most modern surface-mount parts are attached, though they are a little better protected from external forces. And, I assume the lead-free solder is a little less likely to melt if the thing overheats.
. . . but more likely to crack.
ROCK LOBSTER!
Very sensitive radio!
Oooh Glad comments are back!
Re. wiring and slapping solder on two adjacent leads. Yes, that is useless. But I also hate working on stuff where someone has made 'a good mechanical connection' and so good that one end of a resistor takes the LockPicking Lawyer twenty minutes to open. I say use common sense and build it like the makers did. Clean off old solder and reveal a clean mounting hole and a J hook through said mounting hole with a nice clean joint that looks nice. There should be no need to do a 'mid air' knot anywhere...and it's easier to service in twenty years. That technique is military spec.
Nice repair! I was surprised you took on a unit that’s already been worked on. I guess nothing is factory fresh after 75 years, though.
I guess it’s a Not-Quite-All-American 5 now that it has a Japanese audio transformer...
I admit it, I solder things like that. The difference is I'm doing it for "temporary" work so being able to get the components back out easily is more important than longevity.
Let the airplanes majestic sound bring us happiness
You need to build an anti-NSA double-wall Faraday cage room for all your test equipment so you can do you your alignments in peace.
I worked in a pulsed- power electronics laboratory in college, and they had a half dozen of these beautiful Faraday cages in various lab rooms to keep the experiments from interfering with the test equipment. Really great places to hang out if you were trying to avoid calls on your cellphone. "Sorry love, I was in the Faraday cage all day..."
The bum...bum...bum sound is called a tuning beat.
The cages were built like a full screen porch, where the screens were coarse copper wire cloth on top of fine copper wire cloth, with all the structural members wrapped in solid copper sheet. There were two layers of the cloth soldered between the structural members, with each layer spaced a certain distance apart so that a standing wave has a hard time getting through both, as the spacing is not compatible with the wavelength at lambda x 0.5, 1.0, etc.... The floor was elevated and shielded too. The whole thing was earth-grounded.
32:50 Reminds me of people who get the front wheels realigned just because the previous owner put the steering wheel back one-tooth-off-center, or replace a clock movement because the hour hand got bumped half an inch. The obvious things are sometimes the easiest to overlook.
Glasslinger is the king of tack soldering IN REPAIRS! Just drives me crazy. I don't watch his (her?) videos any more.
oh nice. i have a 1948 variant of one of these (different model but still Bendix) and it has AM and FM bands. sadly the filter caps are gone and such so it buzzes badly so i don't ever use it. but all of the tubes are 100% original none were replaced and look good the case has no scratches or any kind of damage it looks almost new. so it most likely used once in awhile but mostly sat around. i wish i can restore it but... think the wire mess looks bad here.. never seen anything yet on that unit..
Be methodical, take it one component at a time and you can restore it. It's just wires...
Nice work!
About at 2:20 there is quite the old radial engine airplane climbing out! I would have been very excited and been distracted trying to find it in the sky
just after dropping the payload of new valves for shango66
@@huwkelvinmorgan3575 Valves from a cargo load or valves blown out of the radial engines exhaust?
@@mattdavala3790 i'm going to go with the Valves from the cargo load with a whistle tone dropping lower and lower as it gets closer to the ground as shango66 looks up and thinks to him self " you know the closer it gets the more it looks like a Piano " lol
Impressive how many local AM stations you've still got there
Wonder what those who built the radio in 1946 would think of it sounding so good in 2021 (or about the digital test equipment that was used to align it)? Great video.
I have this exact chassis at home. It's performance is lackluster even after going through it. Neat looking radio though.
17:18 the only reason to 'glue' it in place like that, is when you need to hold the component in place so you can solder the connection on the other side properly.
Ideally you prevent any mechanical tension on the leads too. I like tacking it in place and afterwards bending the leads correctly around whatever i'm soldering to. Then, with the thing in place, solder properly.
HOWEVER. For a little diy project, that crappy soldering job is fine. Sometimes you just make something that is not meant to last for decades, like a radio.
16:50 I mean, those are fun little projects, just dont expect then to last very long.
Crappy work begets crappy people.🤣🤣🤣🤣🤣
Dead bug prototyping. It has it's place in the shop or lab.
Never live-swap tubes in a mid-century Zenith Transoceanic. The 9 volt filament circuit will rise above 100 volts with a tube removed, blowing the weakest tube in the string when a tube is plugged back in.
I think it's good practice to not hot swap tubes at all in any piece of old gear, the less stress you put on the tubes the better.
@@vancouverman4313 I agree.
There was a hidden valley ranch powder stuff product thing advertisement at the beginning when I watched this... twice. Just thought you should know.
My 526 just needed PS filter cap. Totally original, very good performance. Used daily. After 20 to 30 minutes warmup the frequency shifts just enough to need a tiny centering adjustment, then stays there. The audio is excellent.
Dial lamp (#47) is designed into the rectifier circuit, needs to be installed. Explanation here.
www.nutsvolts.com/questions-and-answers/not-just-for-looks
Shango's advice on also changing the coupling cap to the output tube is definitely worthwhile.
Thanks for the good advice. That shit's going to fail horribly if it ever does. I recall wiring something like that but it was low current. From now on I won't do it even if it felt safe because it gets copied.
I hope the owner is grateful you put it right, and doesn't screw with it.
Good job
In a noisy environment disconnect the aerial or put the oscillator out of action - if the Oscillator Mixer valve has a separate triode in it then disconnect the anode to this section. And who the heck listens to Classical Music on AM..... again here changing all the capacitors would not cure this radio as you found it. What do you say to that Jason Cruz?
That's what I was saying the entire video, disconnect the antennae and just force feed it like a modulator LOL
He did a whole video on how ludicrous classical on AM is. That station was oldies until recently.
@@5roundsrapid263 I know. The gap between what the public want and what they get is widening and it will bite them on the posterior!
I really love what you're saying about the quality of work here. You know, those YT videos with "projects for quarantine" is something that will never leave the desk in one piece, or in a box as a finished device. You can consider it as a test mock-up. And who's building a mock-up as a rock-solid tank? :)
Just for picking a little bit: 15:12 poor old japanese transformer was waiting like a good 50 years to become the protagonist of the show, and then... you damage the bobbin immediately after your MIL-SPEC mechanical fixing :)Bummer... :)
21:03 Disabling local oscillator would be standard operating procedure at this point, correct? Shorted loop of wire aroung loopstick or wire antenna on back cover. Or, I'm not sure if this is correctright ground oscillator lead at variable tuning capacitor.
Good information for me on the audio output section. Single ended class A operation so there would be nominal base level of current flow through output transformer. I never measured or thought about it.
Beat oscillation, beating, beat frequency.
Happy New Year and God Bless!
Yes! It's a good day, more videos from Shango! Is there going to be a part 3 to the admiral console?? I'm really interested to see how that tv turns out!
You could build a screen room to protect against RF signals, but it wouldn't stop airplane noises. I guess you need a screen room within a soundproof room. Also it has to be big enough for your video studio. That will cost a lot of Rubles.
The old books suggest a metal box much like an old bread box. It can be open on one side. They say to ground the box and use a power line filter as well. I've never tried it myself, but I think I will someday because I want to try and test bandwidth and sensitivity.
have you heard about the Radiowealth Black and White TV
Greetings 2:
Won't grounding the ext ant input reduce interference while feeding generator closer to first IF?
Nice!
I’m really disappointed with the lack of loud sustained high pitched noise in this one. Will there be a part 2?
Gotta dress those leads. No use taking the time to long them in just to short them out.
I just view so that i can see all the pretty colors on resistors.. lol
Is there an airshow going on near you? Sounded like a P51 flying above you.
I think it was more like a P51 Oscillator.
hmm LA Oldies still is live on online radio... guess they only went off air there
Yeah, I just saw that. Sat. night disco is still on. Found the stream URL. www.radiosure.com/rsdbms/details.php?id=173846 It's on an HD subchannel in LA.
Maybe the open audio output transtubulator needs marinating in BBQ sauce for an hour or so at 300 degrees. Throw in the oversized .22uF capacitor and baste with more BBQ sauce. Yummy.
@31:45 huh, so they were trying to talk up a mutation in South Africa then too just like now almost a year later.
Isn't what ruined the output transformer DC bias?
New to the valve / tube world, but I know DC will not go through a transformer. It just saturates it turning it into an electromagnet.
NOTE: I'd love to see a 12 volt stereo tube amplifier build one day (even if it is only 30 something watts with 6L6's or 12AX7's).
Also, 22 watts initially, shouldn't this be requiring something 100 watts at least?
The DC B+ runs through the audio output transformer... they have a current rating before saturation of the core (which is often why higher output power transformers have a physically larger core, but that is another topic.) What Shango said is most likely correct. Grid leakage is the common term but it can also be called grid emission, what usually happens is material from the hot cathode contaminates the grid which causes it to emit electrons too, this causes the tubes plate current to rise, which makes the tube run hotter, which causes more grid emission and so on and so on until something blows up. The plate for the tube is fed from the transformer so most likely pulled too much current through the transformer and cooked it alive.
@@n2n8sda Like Lithium ion batteries from my generation, they had issues with thermal runaway in the valve era.
People can clearly learn a lot on TH-cam, if they know what to search for.
Big hugz from Fukuoka Kyushu. Thank you muches.
Also in reply to your question about power consumption.. 20 - 30 watts seems about right. I have a pilot 502 next to me and looking at the tube chart sticker in the radio it is rated for 31 watts power consumption. the 50L6GT (basically a higher voltage 6v6) is only rated to a maximum of about 4 watts... and a 12 volt radio with 30 watts of output (something like a 6L6 as mentioned) is totally unfeasible.. you'd need to pull 10+ amps from the 12V source, which if DC would need to be stepped up to run the HV plates of the tubes, a push pull 6L6 might have anything upto 450v on the plates.
@@n2n8sda I completely understand, a 12 volt DC tube amp would definitely not be efficient, but would still sound "warm", right?
I would not build it to save power, but these cheezy stereo tube headphone amps are a joke. 1 watt. Really LOL
[Edit: yes I know valves have grid voltages into the hundreds, but my concern would be the DC to DC converter to create that voltage introducing any kind of hum into the mix]
Im guessing the shipping broke the windings in the output transformer
Hey @shango066, you should do a 50k subscriber EOL spectacular clip show special with a very special EOL thrown in at the end. Complete with CCP fireworks too!
What's the difference between rototweebulate and rototwerkulate?
Shango, the open transformer wouldn't burn the screen grid of the output tube ?
that can happen in some cases
19:24
Shango!
Tells away
You get a good job with fancy J-hook and you're okay
Solder
It's a gas
Grab that J-hook with both hands and make a advance
New joint, connection, buys a new output transformer to show..
As I watch this video I’m struggling not to buy a radio just like this one
Why in US used loop antennas instead of ferrite antennas like in USSR?
Ferrite antennas were used after the mid 1950's or so, But loops were the most common antenna in 1940's radios.
Do not use Japanese output transformer.
All singers will sound like Yoko Ono.
Did you hear about the Audiofool who tunes all his 300B and 211 amplifiers to only sound good with organ music.
Is this the same company that makes brakes today or different?
Same.
"This is wrong"...hehehe...solder connections in space. Maybe the guy building that thing didn't expect the device to last very long, anyway...if you know what I mean...
He wasn't even tinning both sides before blobbing them together: not even half assed. It looked like his goal was cosmetic instead of functional or durable. One overheated FET and that mess falls apart.
I guess no audio is technically underperforming
I think the word you were looking for was heterodyning.
Wait - if I wanted to eat a whole tub of butter, what would be the right utensil for that?
At 16:14 we see a TH-camr who actually thinks tack soldering is perfectly fine. Kids today are lazy ,that's all.
Someone should tell them, oh wait I left a comment there about "j-hooking" two leads ( mechanical connection) and then soldering the connection. Lead free solder will easily crack if subjected to pulling on the joint.
Shango: Bitches at commenters telling him he's doing things wrong. Also Shango: Bitches at other channels for doing things wrong (and making more money).
Though, to be fair, there are degrees of wrongness.
i have a monochrome display ceaa kd30971-002 1981 but i know how it works
You mean by wah wah wah interference? 🤔
Isn't that called beat skip?
@@MikinessAnalog
@@MikinessAnalog Yes, beat. It’s just like tuning in an instrument with a tuning fork or another instrument.
@@5roundsrapid263 I have been told I am worth my weight (54kg XD) in silver at sound checks. Volume up, feedback .... "that is 420ish Hz" , eq that frequency down, repeat.
I guess I am helpful, they pay me well LOL
@@MikinessAnalog the most musical example of which IMHO, is a go fast boat with at least twin engines at speed.
Nothing like a pair of V8’s harmonizing while burning gallons of gas in compensation for the captain’s shortcomings. 😉😆
Must be radio Disney is leaving cause COVID has Disney taking a bath in certain areas of business
Poor soldering practices sh1t me TO THE MOON.
HA Ha funny I can do this in 10 munits without a Scmatic diagram
Instead of hollering over the radio to be heard just turn the damn radio down!
WHERE ARE THE TVS, WHERE ARE THE TVS
this is wrong!!!!!!! lol...