Tube Amp Archive

Thanks, but that's not it (does seem like the sort of thing I'd do, though). One other thing I've noticed, which may or may not be important is that the voltage across the first filter cap goes to 0 (or close) as soon as I turn the amp off, which doesn't seem right. I had some problems getting the h...

Thanks, I just tested that again, it's about 1.7v.

Many thanks, here's the info: 12AX7 - 1 - 224 2 - 0 3 - 1 4 & 5 - Heater (6.3v AC) 6 - 210 7 - 0 8 - 0 9 - Heater 6V6 1 - No connection 2 - Heater 3 - 399 4 - 400 5 - 0 6 - No connection 7 - Heater 8 - 23 5Y3 1 - No conection 2 - 397 3 - No connection 4 - 0 5 - No connection 6 - 0 7 - No connection ...

I'm a first ttime builder (as will be evident). I finished a Fender Princeton 5F2 clone, which seems to work except that the output is a fraction of what it ought to be. I tried Gerald Webers trick of measuring the voltage at the speaker and the output would work out to about 1/4 of a watt! I've che...