Hi all, hope you are doing ok.

I have a solid state Marshall Bass 12 which has 100Hz hum (I'm in the UK). It can be heard through the speaker...

I posted about this amp some months ago. It's an Acoustic 150 head I picked up for $100. It had a burned resistor between the power amp and the preamp. I...

Hey guys,

I have my friends Ampeg SB12 and I am trying to figure out a possible input jack miswiring.. I know I am overlooking something extremely...

I found this amp at a yard sale and paid $10 for it. It's in pretty rough shape but surprisingly it works (somewhat). I can't find any name brand anywhere...

As the title says, I have a VT-22 with low and distorted output, which happened out of the blue one day. This is the first revision with toggles instead...

Hi guys
I just received a Trace Elliot Acoustic TA-50 amp, that blows the fuse as soon as you switch it on. I took out all the screws on the wooden...

i have a Roland JC-120 where is the serial number usually located? Trying to figure out what schematic i should be using. It is using 2sd845 for outputs....

I don't post here much as I usually hang out over on TDPRI, but I did want to let you all know that Enzo passed tonight.

While many people knew...

Having a break in Backline Gear repairs here in the shop, and still needing to extract my Tek 7633 Storage Scope from my bench set-up to tackle the absence...

Would anyone have a copy of the latest Roland Blues Cube Artist 80 service manual?
Thank you.

Steve

I have a Boss ME-50 that isn't powering up. I have 9V at various places, but I believe I'm missing the 3.3V line. The schematic I found online doesn't zoom...

.....and automatically adjusts for it so that the mix level stays the same? In case the reason isn't obvious, this would be great for those w/o an effects...

Hello

I have on my bench a Marshall JCM25/50 Silver Jubilee reissue Model 2555.

The Lead Channel as chosen by the pull switch is...

I’m needing the schematics for the amplifier and preamplifier !! Where can I find it!! Thanks

It is the part circled in blue. From a Guyatone GA-1200. It is probably a diode since it is downstream a 56V tap from the PT and there is a RC node following...

Hello:
My FZ-1B works as it should except that the decay cuts dead out at a high threshold rather than decay naturally. Any suggestions? Thanks.

Good morning everyone

A friend gave me a Jazz160 to do a capacitor change and refresh the amp. First problem, I can't find the correct schematic....

I think the NFB (presence) on this amp is designed in order to work for clean & drive mode. Since the clean mode on this amps is what everyone likes,...

Having poured over the original schematics for the Shin-Ei and looked at its >$1k modern versions (Funky-Vibe, Deja Vibe) and familiarizing myself with...

Just opened this up and find R147 burnt, some corrosion on components and jumpers, 2008 SLM 6 pro, no output. Anyone have any experience with these?...

I have a 1966 FZ-1A that needs help! Every note played sounds like a weak pluck into a torn speaker. Splat, splat, splat. I know this pedal can sound better....