Bias mod for Bogner amps - separate bias controls?

azzzy

New member
Does anyone know of a mod to make separate bias controls for each tube (instead of a single bias control for the entire quad)? Or at least separate controls for each pair? I have an Uberschall Rev2 which I love - it is my favorite amp of all time. I use old stock tubes, which - as you can imagine - is getting harder and harder to find in matched sets. For example, I have a couple of dozen Mullard EL34 XF1 tubes but could select only one matched quad. The rest are matched either in pairs or in trios. If I had separate bias controls for each tube pair I could use all those tubes! So... Any info on such mod would be greatly appreciated. Thanks much.
 
I know Mike Fortin use to do that kind of mod on request, i think he did it for Valvequeen's Uberschall. Maybe you would get some info asking in the tech corner.
 
Metal1977":1qqp91lg said:
I know Mike Fortin use to do that kind of mod on request, i think he did it for Valvequeen's Uberschall. Maybe you would get some info asking in the tech corner.

Thanks. Will try there. Also will contact Fortin. :thumbsup:
 
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