Tube Amp Archive

Unless i'm looking at this wrong I would expect it to redplate the way the bias is wired to the standby switch. When in standby mode, your bias supply is open. TM the way I see it and the way it seems to work is the standby switch turns off both the bias and the b+ 2 of the amps has the bias pulled...

If I ground the bridge I get too much b+ since my transformers are 270 0 270. And the schematic with the non ct transformer calls for a 190 190 power trans.

I am grounding the center taps on all 3 amp and floating the bridge

here is the schematic for the powersupply - the bridge is not grounded due to the CT on the transformer, other than that it is more or less identical.

Hello, and thanks for some feedback in advance. here is what I have going on, So far I have build 3 of these amps and they all have the same issue, each amp uses different tubes, different transformers and different B+ voltage, other than that everything else is the same. 1. el34 - 465v at tube, and...

hello Forum, I have been building and repairing amps for the past 15 or so years off and on and I have finally met my match, maybe one of you kind folks can help me here. I have a customers 1980 blackface fender UL twin reverb in my shop to fix, it has been in 3 times, and here is what I have done /...