Think I'm gonna take it to the next rehearsal as it is now.
Sounds awesome, you might as well! The trem is nice. Gotta have at least one amp with trem, you know
If you've got it working, then you have the most expensive parts. Gotta save up the cash for the trannys Been thinking about checking some local electronic salvage places around town.
(Almost) finished. Haven't tolexed the back panels, yet.
The grille cloth is not as straight as I wished it would be and the chassis face is slightly too high (width to height ratio is not accurate) but I can live with the result very well.
Oh, and I decided to go for rubber feet.
I've played the amp in a couple rehearsals now and must say it's better than I thought it would be. Loud enough even with a straight drummer.
Just out of curiosity - in the original schematic the bias voltage is noted as -26v.
With -29v the plates idle at 43ma (1ohm resistor method). I would think that's way too much. Funny thing is, the tubes don't redplate, the transformers and the overall amp don't get too hot and it sounds great (see sound files below).
What do you guys think?
...
With -29v the plates idle at 43ma (1ohm resistor method). I would think that's way too much. Funny thing is, the tubes don't redplate, the transformers and the overall amp don't get too hot and it sounds great (see sound files below).
What do you guys think?
If you measured it correctly, that all depends on your actual plate voltage...
If it was only +320vdc to 340vdc then I'd say you're hot but probably OK with decent tubes and decent cabinet (PA) venting.
Well, I used replacement parts with original specs only. That's why I expected the voltages to be like (or close) in the schematic (the plates are stated at 365v).
My plate voltages with power tubes pulled are 432v. Then there would be the voltage drop of the JJ GZ34
The tubes are JJ 6v6s (matched pair: IP@44 and GM@4) and the cabinet has an open back (just like the genuine one).
Any recommendations?
Last edited by txstrat; 01-25-2009, 08:59 PM.
Reason: added content
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