Excellent series! I learned more about how to follow a schematic in these three videos than I have been able to from all others I've watched. You are very thorough and explain what you are doing very well! Thank you
A little Health & Safety tip - when you wire the Black Live power wire to the fuse holder, wire it to the end connection and not the side contact like you have done. The reason is, that if you wire it to the side connection, then it is possible to make contact with it as you insert the cartridge fuse. If it is wired to the end connection, then there is no way the fuse can give you a jolt when inserting it as it does not see power until the fuse cap has been fully inserted. You should also endevour to fit some form of insulating jacket or boot over the complete fuse holder body and also the switch terminals. Play safe ☺
That was excellent Mark.. Another good amp saved from the garbage.. Irving Mills composition, St James Infirmary was the very first song I learnt to play, (in a rudimentary way) on guitar back in 1963. That is a great version you have there. It was interesting to note how so little extra mains voltage made a noticeable difference to the filament voltages. We have a similar problem here in the UK with most mains TX's rated at the European 230 volts but actual mains supply at 240 +V.
wow..WOW! great series of "tutorial vids"; your simply an awesome teacher. I've learned so much this morning as i gaze at an RCA115B sitting on the refrigerator just begging for service. looking forward to view other videos. jp
Good morning Mark, and everybody watching/reading. This is an especially relevant vid series for me, in that I bought this very amp and it’s tuner two weeks ago for twenty bucks(Craigslist win of the year lol). One of the best coincidences in a while for me. I’m going with guitar amp for mine, but these vids are the best outline I’ve found. I find all your vids very useful and I just want to say “Thank you”. Very hard finding schematics, I searched Silvertone console amp and found a rendering in goog images under “Roberts tech blog”. Nice and clear. As for adding volume and tone controls, any advice y’all could share would be put to grateful use. Also I’d like to share.that for de-burring holes inside the chassis I use an appropriate sized chisel. With a firm hammer tap the burrs push right off, square and clean. Thanks again Mark and good luck to all, happy Thanksgiving
Flea watt amps are great amps. I run near 16 watts a channel push pull 6v6GTA power tubes drivers are 7199 all NOS 1959 black plate tubes by Sylvania into Altec Lansing 15” alnico magnet woofers, horn mids, horn tweeters...rock out more volume than most S.S. SPL. I use a tube preamp with active EQ. Wow such sound stage, imaging and sweet tube voicing. Volume is crazy just at 3 volume control.
Fantastic video series. Really enjoyed these and learnt quite a lot too, thank you for putting these together. Looking forward to your following videos.
I'm about to buy a working Hi-fi tube powered console for 50 bucks tomorrow. Can't wait to convert it to a guitar/ Bluetooth amp for my shop. Gonna get a signal splitting chorus pedal to utilize stereo sound on the guitar. It's an old Bradford.
Hi there! Loved the series. Very informative. At the end of the video, are you running directly into the amp from turntable? Or using an external preamp? Has anyone ever re-used the preamp from a console in this regard? Or is that just silly/not possible.
Nice video Mark. Why didn't you put both the negative speaker terminals in the middle, close to each other, and both the positive terminals on the outer side. You may avoid an accidental short while connecting speaker cables.
Mark an excellent video, you are a natural teacher/coach...love your work...Brisbane Oz....MGB....one question, tabs on external transformers...voltages of any danger??
That was very informative. I have an old transistor console that sounds great for what it is, but now I'm going to widen my search for a tube console. By the way, which speakers do you use on your tube amp? I have a pair of Heresy's that have amazing bass, connected to my Sansui AU-505. This always gets a retort from the peanut gallery, because the Heresy is not known for its low range. One hobbyist suggested that something in the Sansui's circuit lowered its impedance as seen by the speaker, thereby falsely augmenting it's bass response. I don't understand the Why, but the combination of that integrated amp, with the Heresy, means I don't have to use my subwoofer at all. Thank you for your great video.
Mark another great video! I have really enjoyed this series. It has helped me with the 3 Magnavox amps I have just restored. Still looking forward to the 807 SE videos as I do want to build it after you complete yours. Thanks for all the hard work it takes to put these up. PS I have a question for you on the Maggies. What would be the best way to get your advice? Thanks
Hi Mark, I'm curious about C74. Instead of one side of the HT winding going directly to ground it goes via C74. Did it act as a kind of ac voltage divider for the external o/p? could you dispense with that connection now and connect C73 and C74 in parallel and the ht winding to ground?
I gig with two 5 watt amps run in stereo, miced of coarse.I have an AO-33 and I have looked all over for someone doing one of them and can't find one. I don't know much about this, but it looks like it has no power supply in it, There are two boxes and i think the small ones is the power supply.The small one just has two transformers ,a can and two tubes with no boards in it.The two tubes are 5u4 tubes. The other box has has 12 tubes, 1 can and 4 transformers.the big box has 6-6bq5 tubes,-1-12au7,-2-2-6au6,-2-12ax7,-1-12bh7 If you know could you tell me if I'm right. I would thank you for any information.Good song,by the way.Thank you.
No, those are low level signal resistors, little to no heat involved. It's mostly power supply dropping resistors you need to worry about or cathode bias resistors.
I would have pulled the original filter can caps since they aren't be used and plugged the holes. Also, there's shock hazard with no bottom cover on the chassis.
Why pull them when they are disconnected and preserve the original look of the amp. Agreed, it could easily be done but I think they add to the look of the amp. A lot of tube amps have shock hazard (plate caps, no bottoms, exposed transformer wires. This is not for public use, more so buy someone who knows what they own.
That will effect the sound quality of the amplifier..Their size is going to dictate the bandwidth of the unit. The manufacturer didn't want it to have too strong of base output or too high of treble...
Excellent series! I learned more about how to follow a schematic in these three videos than I have been able to from all others I've watched. You are very thorough and explain what you are doing very well! Thank you
A little Health & Safety tip - when you wire the Black Live power wire to the fuse holder, wire it to the end connection and not the side contact like you have done. The reason is, that if you wire it to the side connection, then it is possible to make contact with it as you insert the cartridge fuse. If it is wired to the end connection, then there is no way the fuse can give you a jolt when inserting it as it does not see power until the fuse cap has been fully inserted. You should also endevour to fit some form of insulating jacket or boot over the complete fuse holder body and also the switch terminals. Play safe ☺
I'm currently rebuilding an old Silvertone Model 62 that as a 528-59700 chassis and found this very informative. Thanks for the video series.
That was excellent Mark.. Another good amp saved from the garbage.. Irving Mills composition, St James Infirmary was the very first song I learnt to play, (in a rudimentary way) on guitar back in 1963. That is a great version you have there. It was interesting to note how so little extra mains voltage made a noticeable difference to the filament voltages. We have a similar problem here in the UK with most mains TX's rated at the European 230 volts but actual mains supply at 240 +V.
Awesome restoration Mark and great song at the end.
wow..WOW! great series of "tutorial vids"; your simply an awesome teacher. I've learned so much this morning as i gaze at an RCA115B sitting on the refrigerator just begging for service.
looking forward to view other videos.
jp
Good morning Mark, and everybody watching/reading. This is an especially relevant vid series for me, in that I bought this very amp and it’s tuner two weeks ago for twenty bucks(Craigslist win of the year lol). One of the best coincidences in a while for me. I’m going with guitar amp for mine, but these vids are the best outline I’ve found. I find all your vids very useful and I just want to say “Thank you”. Very hard finding schematics, I searched Silvertone console amp and found a rendering in goog images under “Roberts tech blog”. Nice and clear. As for adding volume and tone controls, any advice y’all could share would be put to grateful use. Also I’d like to share.that for de-burring holes inside the chassis I use an appropriate sized chisel. With a firm hammer tap the burrs push right off, square and clean. Thanks again Mark and good luck to all, happy Thanksgiving
Great sounding amp. Nice private label song. The guitar solo gave me goosebumps.
Flea watt amps are great amps. I run near 16 watts a channel push pull 6v6GTA power tubes drivers are 7199 all NOS 1959 black plate tubes by Sylvania into Altec Lansing 15” alnico magnet woofers, horn mids, horn tweeters...rock out more volume than most S.S. SPL. I use a tube preamp with active EQ. Wow such sound stage, imaging and sweet tube voicing. Volume is crazy just at 3 volume control.
Nice series Mark. Thanks for spending the time to create these videos; much appreciated.
Fantastic video series. Really enjoyed these and learnt quite a lot too, thank you for putting these together.
Looking forward to your following videos.
Was very skeptical about your work until I actually saw the videos 😎
26:50 - Those two 'lonely' ground leads could be moved to the ground lugs on your terminal strip!
I'm about to buy a working Hi-fi tube powered console for 50 bucks tomorrow. Can't wait to convert it to a guitar/ Bluetooth amp for my shop. Gonna get a signal splitting chorus pedal to utilize stereo sound on the guitar. It's an old Bradford.
What brand is the turntable it's very pretty
Hi there! Loved the series. Very informative. At the end of the video, are you running directly into the amp from turntable? Or using an external preamp? Has anyone ever re-used the preamp from a console in this regard? Or is that just silly/not possible.
You use Silver teflon wire with silver core? Or copper? Any part link plz?
Nice sounding amp there. Great work and thanks for making this video series on tube amp conversion.
Nice video Mark. Why didn't you put both the negative speaker terminals in the middle, close to each other, and both the positive terminals on the outer side. You may avoid an accidental short while connecting speaker cables.
Great vids. I wish i had found them when i started rebuilding councel amps! Curious as to why you don't use preamp filament windings as a bucking?
Amazing work, Mark! Hope to use your services one day!
Hey, thanks for the video. What size fuse did you use? What was the rating of your power switch?
Also what size volume pot would you use?
Sounds great hooked into your system!
Amazing work !!! You have amazing perseverance !!! Love your vids. Thanks for posting.
I have a newer tube amp. Can I hook this into my 1950 Grundig?
Nice job! :) Is it possible to use red LED.s to take down the 0.3V in the heater suply line, close to the valves, that is..
The current required for the heaters is way too much for an LED.
Mark an excellent video, you are a natural teacher/coach...love your work...Brisbane Oz....MGB....one question, tabs on external transformers...voltages of any danger??
nice job!!! also really enjoyed the St James infirmary cover. do they have a website to purchase their music from?
Cheers
That was very informative. I have an old transistor console that sounds great for what it is, but now I'm going to widen my search for a tube console. By the way, which speakers do you use on your tube amp?
I have a pair of Heresy's that have amazing bass, connected to my Sansui AU-505. This always gets a retort from the peanut gallery, because the Heresy is not known for its low range. One hobbyist suggested that something in the Sansui's circuit lowered its impedance as seen by the speaker, thereby falsely augmenting it's bass response. I don't understand the Why, but the combination of that integrated amp, with the Heresy, means I don't have to use my subwoofer at all.
Thank you for your great video.
What about the two old Crystal caps left in
Thanks for taking the time to make these videos.
Looking at an Elecrohohme PA 300 integrated amp $135 Canadian what do u think?
Mark another great video! I have really enjoyed this series. It has helped me with the 3 Magnavox amps I have just restored. Still looking forward to the 807 SE videos as I do want to build it after you complete yours. Thanks for all the hard work it takes to put these up.
PS I have a question for you on the Maggies. What would be the best way to get your advice? Thanks
Find my website and send me an email
Hi Mark, I'm curious about C74. Instead of one side of the HT winding going directly to ground it goes via C74. Did it act as a kind of ac voltage divider for the external o/p? could you dispense with that connection now and connect C73 and C74 in parallel and the ht winding to ground?
Hey cant quite make out the name of the band. Would love to hear more of them
Thumbs up for the Maverick Audio equipment!
I feed it via an optical cable from my pc. Really like the unit.
Yes, nice little gem. Enjoy!
I gig with two 5 watt amps run in stereo, miced of coarse.I have an AO-33 and I have looked all over for someone doing one of them and can't find one. I don't know much about this, but it looks like it has no power supply in it, There are two boxes and i think the small ones is the power supply.The small one just has two transformers ,a can and two tubes with no boards in it.The two tubes are 5u4 tubes. The other box has has 12 tubes, 1 can and 4 transformers.the big box has 6-6bq5 tubes,-1-12au7,-2-2-6au6,-2-12ax7,-1-12bh7 If you know could you tell me if I'm right. I would thank you for any information.Good song,by the way.Thank you.
Find my website, get my email off there and send me a pictures.
Will do-It may be a couple of days-Thanks.
One of 47uf caps is resting on the transformer. Will heat be an issue over time?
No, those are low level signal resistors, little to no heat involved. It's mostly power supply dropping resistors you need to worry about or cathode bias resistors.
What type of caps are you using to replace the .02 uf ceramic?
Panasonic .022UF 630v metalized polyprophylene film caps
Thanks! Making my parts list for a Silvertone 528-59700 restoration.
I would have pulled the original filter can caps since they aren't be used and plugged the holes. Also, there's shock hazard with no bottom cover on the chassis.
Why pull them when they are disconnected and preserve the original look of the amp. Agreed, it could easily be done but I think they add to the look of the amp. A lot of tube amps have shock hazard (plate caps, no bottoms, exposed transformer wires. This is not for public use, more so buy someone who knows what they own.
Won't you consider releasing your records to Deezer/etc? I'm sure there would be a market.
That diode (1N4007?) should have been mounted right next to the 1K-ohm 10W resistor, IMO. Too much heat and it could affect it.
There is a good 1/8 inch separation. No worries. If it as a cap, different story.
The only thing I worry about are the open power leads
Very nice video. Thanks Mark!
I would of left the ceramic capacitors they usually don't go bad. If replaced use ceramic replacments
That will effect the sound quality of the amplifier..Their size is going to dictate the bandwidth of the unit.
The manufacturer didn't want it to have too strong of base output or too high of treble...
My Casta C would be in love with this amp
Silvertone medalist?
Why don't you use a power resistor to bring a voltage down!
If only it was that simple...
Blueglow Electronics what do you mean if it was that simple! of course it's that simple!
I wish it was...
electronic 101
jon fraer your guess is as good as mine if you put a in-line power resistor of 50 watts to step it down 117 volts shouldn't be a problem
Sounds great
great video thanks for sharing
really nice video
Stripping teflon wire with a heated stripper? You don't like yourself very much do you?
Nice!!