I'm new to the forum but not completely new to amp building (completed 8 or 9 amps). I have a couple newbie type questions and, though I did try searching the archives, I can't find a clear answer. So I'm hoping someone will indulge me:
1.) Why do some folks use "goop" (looks like silicone) on some of their caps? I'm guessing this is used to damp vibration. I know this is a high gain circuit and oscillation can be a problem, but does gooping up your caps actually make the circuit quieter, increase reliability, or...?
2.) What is the purpose and function of the diodes on the power tube sockets between plate and ground? I've never seen anything like this on vintage amps and just plain don't understand what it does. Can someone enlighten me?
Some Basic Questions
Moderators: pompeiisneaks, Colossal
Re: Some Basic Questions
1.) Why do some folks use "goop" (looks like silicone) on some of their caps? I'm guessing this is used to damp vibration. I know this is a high gain circuit and oscillation can be a problem, but does gooping up your caps actually make the circuit quieter, increase reliability, or...?
Mostly to increase reliability and to avoid any lead fatigue due to vibration/flexing.
2.) What is the purpose and function of the diodes on the power tube sockets between plate and ground? I've never seen anything like this on vintage amps and just plain don't understand what it does. Can someone enlighten me?
this is a flyback voltage safety feature, to prevent transient voltage spikes. Tho uncommon, it's not completely unique. Ken used to do this on Marshalls he serviced as well.
Mostly to increase reliability and to avoid any lead fatigue due to vibration/flexing.
2.) What is the purpose and function of the diodes on the power tube sockets between plate and ground? I've never seen anything like this on vintage amps and just plain don't understand what it does. Can someone enlighten me?
this is a flyback voltage safety feature, to prevent transient voltage spikes. Tho uncommon, it's not completely unique. Ken used to do this on Marshalls he serviced as well.