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In Reply to: RE: Fisher 55a transformer in driver stage cathode posted by nerdorama on May 16, 2009 at 16:17:24
Without voltages and currents for the driver stage it's pretty difficult to predict what will work in this circuit as it is drawn. As I read it, the IT primary is the cathode load resistor from a DC standpoint and, therefore, the primary resistance is important in setting the operating point of the driver stage. Without knowing the currents and voltages, it's impossible to do anything but guess what the resistance should be.
Kevin Carter
K&K Audio
www.kandkaudio.com
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