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robert casey
 
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I am going to replace the selinium rectifier with silicon, do I need to put
a dropping resistor in to compensate for the efficiency of the silicon or
should I be fine with a direct replacement? BTW this one has bias and
balance for each pair of 7591's much like the early 299D, seems I have a
weird one!

Is this the bias rectifier only? As there is an adjustment pot,
the silicon diode giving you more voltage doesn't much matter
as the pot would be readjusted anyway. Higher negative bias
voltage will reduce quiescent current thru the tubes anyway,
so the danger is minimal if you didn't readjust.