The Amp Garage

Thanx, Colossal
That was the first amp I retrofitted with your relay board. Thank again.

Thanx Phil, I appreciate your file management skills! I've got to setup my recording gear to get better tracks. Phone is just too easy and not too bad, considering.

phone clips.
The first one is muted as I had the phone facing backward. '57 Strat, clean channel cranked, no effects.

Previous convention dictated tubes that had beam deflectors internally connected to the cathode were Beam Tetrodes, not pentodes, as they can't be separated. Some designers prefer to have a negative voltage on the suppressor grid, this can only be done with a true pentode. Forming plates are helpful...

Anyone know why the KT tubes require separate cathode resistors? Their tendency to oscillate easily maybe?
I'm looking at designing an amp and as my first KT66 foray I see they are an oddity in the 6L6 grouping.

the capacitor is styrene I believe.
And the round B60 component is a bridge rectifier also.

I've not seen what you describe before. I've seen outputs modulated with line frequency, but not with the input freq. I'm betting on a circuit ground problem. I assume your scope ground is good. Does the percentage of modulation increase with increased gain?
Schematic?

1/2 Amp fuse seems a little small. I'm not surprised it would blow with the turn on surge.

I'm sure space is an issue, but the closer to the associated circuit the better, since your off the card anyway. Pics always critical for best advice!

Ian...thanks! Seeing you are from Canada...I just ran thru the intro of a song by one of my most heart felt, favorite groups.....RUSH! Limelight is a go-to song when I need to feel better? Not just saying this because you posted....but I LOVE Canada. One of our daughters-in-law is Canadian! One mor...

you mean 10 or 20 Watt, right?

No, don't do it. A large part of the magic is no feedback from around the transformer.

Thank you. My first time with the faux binding and the headstock inlay.

a nasty soap like smell, my daughter would call that cilantro.