Tube Amp Archive

First off, be very careful with a pencil, graphite is conductive and can kill you, use a wooden chopstick to poke around. I actually used a paintbrush :D I think my voltage readings are all okay from what I can tell on the schematic. The amp was working just fine before I tried to change the circui...

Even without a O -scope if that happens to be the case there are simple ways to check signal flow through a amp with just your voltmeter, some clip leads and your guitar or something like your phone to pump out a test signal. What you want to do is set your meter for AC volts and then check the dow...

Anyone else have any more ideas on where to go from here? maybe restore the circuit to stock then try again?

First off was the amp working normal before you made the mod's? Second thing is someone new to working on and learning to mod amps should not be starting out with a amp that has so many gain stages! You may have bitten off more then you can chew here for a newbie! It's real hard to tell from the ph...

Hello! This is my first post on the amp garage so I would just like to say thank you all for being here! I am very new to working on amplifiers, I picked up a silverface Ab165 as my first amplifier to mod, I was researching different things you could do to the circuit and I found a common thing to d...