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12SX7 for 6SN7 in MA1 Mkll - Step 1

Posted by Atmaluvr on April 17, 2005 at 11:28:22:
OK, I've got one of the amps on the bench with the bottom off, and measured & traced filament supplies for V1 - V4. V2 & V4 are getting their filament voltages from a separate center tapped transformer, so no problem getting the 12.6V needed, just switch taps. However, V1& V3 are getting their filament voltage from the board that runs down the center of the amp from side to side. Checking these does not reveal any way to boost the voltage as easily as V2 & V4. Should I
A) Add another 12.6 V filament transformer to power V1 & V3
B) Use the existing 12.6 V transformer for all the input tubes (not sure about this option, the filament transformer is only rated for 1.2 A output).
C) ?????
Suggestions, anyone?
TIA
Greg