xxJPMxx

Thanks for the kind greetings. It's actually funny, I have been a member on here for years but never participated. I noticed there is this tube section which really interests me so I plan to participate more now. I am not sure if I can fill anyones shoes but I will share what I do know. I shall never question a seasoned member such as yourself ever again Maybe we will get an update on thebes progress this weekend. For all we know he's got it fixed and jammin out as we type LOL!

I do both depending on what the symptoms are. If I think it's in the power amp section I start there, if I think it's in the front end I start there. I have two issues with Maynards methodology and that's one; how is the OP going to get two equal signals 180 degrees out of phase to drive the power tubes? Second; How is the OP going to get enough drive voltage to the output tube grids? You will need something like 100V peak to peak. So for a beginners sake I think it is much more practical to use a line level source like a computer or CD player to drive the input and then see where the signal gets lost. I still have my money on the first stages cathode bypass cap

I would download a free signal generator. Not sure what OS you have but I run linux and I have Siggen. I am sure there are free ones for Windows users. If not then you could probably find a 60Hz test tone on youtube. Why 60Hz? Because at that frequency your multimeter will have the best resolution. Or use whatever frequency your heart desires. Always start at the input that way there you can see where it is getting lost or attenuated. Since you do have one channel working you don't even have to calculate each stages gain just compare it to the working channel. You want to compare input voltage to AC voltage at the plate (pin 3 I beleive) through a capacitor, make sure the capacitor is 400v rated, any small value cap should be okay because the input impedance of most meters are pretty high. Have you measured DC operating points yet?

Do you have a scope? You seem to know how to use a meter so check operating voltages of bad channel against the good channel. I would rule out power supply because both channels would be effected. Possibly bad cathode bypass cap for the 6BH6 reducing gain.

Wow, thanks for all the info and your time to explain it to me! The reason why I was asking was I had an extra k-24-k driver from my heresy II's and have lately been speaker rolling in my fender blackface deluxe reverb (20watt guitar amp) and wanted to try the k-24-k. I did end up trying it and thought it sounded alright but it didn't stay in there very long.

How high does this driver reach in regards to frequency? Thanks in advance