The Amp Garage

Thanks for all of the help guys. This will probably be the last time I take a box of parts from someone and they say, "Build me an amp." Then come back after it's 90% done and say, "Oh yeah, I want this and that and the other thing too!" :roll: I'm just going to tell him to deal with the 6V6s; bette...

That's what I was afraid of: needing more HV on the PT secondary. The PT I'm using is the one found at this link: https://www.tubesandmore.com/products/transformer-fender-replacement-power-330-0-330-v-120-ma It's rated for 660 V CT @ 120mA; 6.3 V @ 3A; and, 5 V @ 3A. I think that's enough heater cu...

That's what I was afraid of: needing more HV on the PT secondary. The PT I'm using is the one found at this link: https://www.tubesandmore.com/products/transformer-fender-replacement-power-330-0-330-v-120-ma It's rated for 660 V CT @ 120mA; 6.3 V @ 3A; and, 5 V @ 3A. I think that's enough heater cur...

Thanks for all of the input guys. I lifted each of the coupling caps and measured no leakage. Set it aside and waited for the 10K pot to arrive. I installed the adjustable bias mod and now it is rock solid stable. Left the amp on for over a half hour and still solid. It must have been a cold solder ...

So I installed a brand new set of matched 6V6 tubes and powered up. The plate current went to 30mA on each and I powered down immediately. I must have smoked one or both sets of the test tubes. I'm going to install an adjustable grid bias in it. I'll need to order a 10K pot. I just don't want to ris...

Well, no dice. I noticed that the inside tube's bias voltage dove about -7 VDC more than the outside tube (-17 VDC versus -24 VDC) while the -37 VDC was constant coming from the diode.. I'm going to see if it follows the tube or the socket. I suspect it follows the socket. But, maybe the tube smoked...

Thanks for the tip Martin and Pompeii! It will give me something to do instead of over thinking and screwing something else up in the process. So, if i am understanding this correctly, basically tack two 120K resistors in series, solder the bias lead to one end, join to the board at their junction, ...

Hey all, Long time lurker, but never had to post before. Heck, I learned so much from this site that I always had my questions answered. But this issue has me stumped. I recently completed an AA1164 Princeton Reverb clone. Everything tested fine at start up. Plate voltages are within spec (450 VDC o...