First build, hum issues

[M Fowler]

Seems to me you should have built the amp first then asked questions well at least that's how I build amps.

Seems like we were being tested

[joshdfrazier]

fowler: yeah i'm sure i'm irritating some folks, sorry! i'm not trying to test anyone? not sure how you mean.

structo, here are the voltages in dc:

V3 pin 7 = 248

V2 pin 7 = 246

V2 pin 9 = 230

V2 pin 3 = 7

V1b pin 6= 134

V1a pin 1 = 152

V4 pin 1 = 172

I may actually not need to change the PT, actually. I would still like to know how high I can safely go, though. The cannabis rex is extremely loud. Also, I would not be able to fit a larger transformer.

[Structo]

Actually those voltages look pretty good.

The power seems to be around 11 watts.

[joshdfrazier]

11 watts, really? Seems like alot for a single EL84. I did use it at practice today. We play loud, and I didn't even need to crank it up all the way. PT was pretty hot to the touch, but not unbearably so.

[Structo]

Yeah, when you burn your fingers on the power switch, probably time to look for a higher current rated PT.

[Firestorm]

PT shouldn't get more than warm (unless it's getting heated radiatively by the output tube - one EL84, probably not). Total power consumed by that tube could be 12W or a little more, but output power can't be more than 6W or so.