I have a dual rectifier that generates hum with all pots to 0. The hum disappears when I remove the inverter tube. I've tried replacing all the tubes, and...

I have found a list of Peavey transistors with in house numbers, alternate in house numbers, field replacements, and notes
https://www.google.com/u...

Have you guys ever blackened steel parts? I want to blacked some speaker attachment screws. I would paint them, but once I install them, the paint will scratch...

Hello All. Someone asked me to fix a Vox DA15. It only turns on power LED. No function beyond that. My conclusion is that the logic functions aren't functioning....

Hello everyone,

I’ve just repaired a vintage Standel Custom 30 Bass amp. There’s a disc-shaped component that was heat-epoxied to...

To start I hope that a good amplifier tech can help me out here to eliminate any confusion I would love to go through the amplifier with you on the phone...

Hello,
I own a nice hiwatt sa112. It's a combo, with the same schematics than the head hiwatt dr504.

I was playing it fine, then suddenly...

Greetings,

I have an old PA amp that uses 6SJ7 preamp tubes that I’m tweaking for guitar use. It has three essentially identical channels....

This one has me puzzled. Currently I have all new tubes in the amp, 12ax7 and el34. The last time I worked on this amp was 5 years ago, and it's been good...

Hey folks,

I managed to eliminate the hum by replacing the main filter caps, but now I'm getting heavily distorted output. Traced it down to...

So I have a Martin with a Fishman Classic 4 preamp module in it. When I plug the cord into it, the led flashes but then goes off again and the only sound...

Can't find a clear or normal size BE 100 scem ...just fuzzy/tiny. Anyone got a clear one ??

Hello Everybody,
I'm attempting a fix on a preamp made by LR Baggs that is in a Godin Acousticaster guitar. It was brought to me with a noisy volume...

Hot Rod DeVille. (This amp does not have heat damage of the low voltage circuit. Both supplies are fine. )
Came in with no reverb. Distorted output....

Whatever the typical taper that is used on the 500k pots in LPs and other gibsons these days, i find that i want the volume to drop gain faster than they...

All I have is a multimeter
https://photos.app.goo.gl/Z9d1CpHdqSWT4vTm8
Here is a data sheet for the part
https://www.google.com/url?sa=...

Does anyone have ideas on how to fill in the missing white paint on this faceplate?

...

This is the 120 watt unit.

Got this JSX with audible hum and is showing 120 Hz hum on my phone spectrum analyzer. It is present with no input...

I am electronic technician but have limited test equipment and guitar amp repair experience. I have a modified Fender Deluxe Reverb that sounded super (i...

Hi all,

Was hoping to get some insight into what might be going on with this Marshall JCM2000 DSL100 I am working on. I took the necessary steps...

Working on a "77 Peavey Classic 212 that cuts out with a pop once in a while in both channels. It has only done it maybe 3 or 4 times, but I have confirmed...