MC30 Power Iron

Krusty

New Member
Hey-Hey!!!,
I have a very ratty MC30. While reading schematics I found a tap for the negative supply in the main HV winding, but nothing like that on mine. Other discrepancies include a 450V capacitor on the negative rail and a resistor before the diode for the negative supply's half-wave rectifier( single diode).
The Q: how long before the change to a tapped HV winding was made, and how big is the resistor in the RC filter on my amp? Also none of the voltage divider resistors match the later schematic so what should the bias voltage be, or the cathode voltage on the 12AX7's, or likely 12AT7 which is what the CF was in the 75's...
regards,
Douglas
 
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