This was quite helpful. I have a similar problem but with a solid state Fender Princeton Chorus and a faulty input jack. With your video, I think I may attempt the repair despite the difference in tube technology vs. a solid state board.
I love mine :) I saw it on guitar center website with EV shining through the grill cloth.. got them to 450 and when they shipped it, ups dropped it and busted the cab… so they knocked off $300! 😅 so super twin reverb with ev classics for $180 ☺️ thankfully someone had put a fan jankily hanging off the back and the reverb wasn’t working which knocked the price down.. took the fan off and replaced some coupling caps for the reverb. Which made it work again :) changed the first cathode bypass cap from the 500uf to more like… 15uf.. glued the cab back together and it’s probably better than before :) I think it sounds fantastic :)
Nice video, only part I didn't like is you're avoiding the subject of 'how not to make this amp kill you' by plainly saying "only touch the parts around the input jack". I think that's bad practice, stimulating diy amp repair on the one hand but avoiding the most important subject on the other hand. I personally think it's your responsibility to teach people how to do this safely OR don't teach them at all.
I have a Red Knob Twin amp. Each of the input jacks work, but if the cables are moved slightly, the sound dies. I have to tap the cables into a certain place before the sound comes back again.
THe very first thing you should do is replace the bulk (largest, input) capacitors, as a primary job of theirs is to filter the 60 Hz or 50 Hz hum. What I really think you should do is record the hum into some digital gadget, perhaps your phone, then analyze it with any suitable software or plugin. If you see that the hum is 50 or 60 Hz with overtones at multiples, it is easy to suggest that replacing those caps with extra goodness, nice quality ones will make it happy. It does cost a little bit of money, but nothing at all really compared to new gear days and things like that. heh
All that stuff had been replaced about 5 years ago, I took it back to the tech that did the work a while back and apparently I just had to adjust the output tube matching just a tad and that completely got rid of the hum, there's also a hum balance on mine apparently but he said it was best to adjust it with the output matching thing first if that solved the hum problem
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This was quite helpful. I have a similar problem but with a solid state Fender Princeton Chorus and a faulty input jack. With your video, I think I may attempt the repair despite the difference in tube technology vs. a solid state board.
I love mine :) I saw it on guitar center website with EV shining through the grill cloth.. got them to 450 and when they shipped it, ups dropped it and busted the cab… so they knocked off $300! 😅 so super twin reverb with ev classics for $180 ☺️ thankfully someone had put a fan jankily hanging off the back and the reverb wasn’t working which knocked the price down.. took the fan off and replaced some coupling caps for the reverb. Which made it work again :) changed the first cathode bypass cap from the 500uf to more like… 15uf.. glued the cab back together and it’s probably better than before :) I think it sounds fantastic :)
The Super twin is a beast but it has some excellent clean sounds.
It's a great amp. All the clean headroom you could ever need! Thanks for the comment.
Nice video, only part I didn't like is you're avoiding the subject of 'how not to make this amp kill you' by plainly saying "only touch the parts around the input jack". I think that's bad practice, stimulating diy amp repair on the one hand but avoiding the most important subject on the other hand. I personally think it's your responsibility to teach people how to do this safely OR don't teach them at all.
If you hold your beer with one hand and repair with the other then at least you are following the one hand rule.
And poking around the ap with a screwdriver is not a good idea!
Are you going to repair the hum?
Turn the guitar pickups orientation relative to the amp - there will be some quieter spots?
I have a Red Knob Twin amp. Each of the input jacks work, but if the cables are moved slightly, the sound dies. I have to tap the cables into a certain place before the sound comes back again.
I have that exact hum on my sf twin reverb, would that be an easy fix for an amp tech?
THe very first thing you should do is replace the bulk (largest, input) capacitors, as a primary job of theirs is to filter the 60 Hz or 50 Hz hum. What I really think you should do is record the hum into some digital gadget, perhaps your phone, then analyze it with any suitable software or plugin. If you see that the hum is 50 or 60 Hz with overtones at multiples, it is easy to suggest that replacing those caps with extra goodness, nice quality ones will make it happy. It does cost a little bit of money, but nothing at all really compared to new gear days and things like that. heh
All that stuff had been replaced about 5 years ago, I took it back to the tech that did the work a while back and apparently I just had to adjust the output tube matching just a tad and that completely got rid of the hum, there's also a hum balance on mine apparently but he said it was best to adjust it with the output matching thing first if that solved the hum problem
Fixing Marshall input jack
what if it’s just making no noise at all??