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biaing my Scott 340 receiver questions...

Posted by gkargreen (A) on December 11, 2016 at 15:49:37

I am restoring one of these, using vintage 7591 tubes one channel gives me about 34 ma across a 10 ohm cathode resistor (added for measuring bias) and around 25 ma across the other pair, which tested weaker than the first pair. From what I see here the first pair is doing well @ 425v on plate with, combined with the cathode current, gives me around 14.5 watts per tube. The second pair though is giving me around 9 watts, unlike other Scott amps, there is no bias output adjust, although the voltage at the grids are the same at around -18.? per tube. Does it appear that I need to replace the second pair (or buy a new matched quad) as I cannot get the required cathode current in the second pair? Thanks!

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