I would like to know if using 12v 1625s instead of the 6v 807s would cause any issues besides using 2 of the 6.3v filaments in series for the 12.6v tubes.
http://pmillett.com/HV_bench_supply.htm
http://pmillett.com/HV_bench_supply.htm
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No issues.
Note that the 2 x 6.3 V filament supply for this must be able to withstand the full output voltage (400 Vdc) since the filaments and the cathodes of the 1625's will be connected to eachother (that's done to be sure that the maximum cathode to heater voltage is always respected; by connecting the filaments and cathodes that voltage will ofcouse always be 0 V).
Note that the 2 x 6.3 V filament supply for this must be able to withstand the full output voltage (400 Vdc) since the filaments and the cathodes of the 1625's will be connected to eachother (that's done to be sure that the maximum cathode to heater voltage is always respected; by connecting the filaments and cathodes that voltage will ofcouse always be 0 V).
Good point. I checked the tektronics 545a schematic for the 120-120 power transformer. I see Pete choose pins 27 & 28 6.3v terminal which is lifted to 225V. Since this worked for him I am speculating this transformer can handle the 400vdc. So I need to choose another that has a lifted voltage. I have read that the two 6.3V sources need to have the same current handling capabilities. Is this correct thinking?
About the current handling capability: I don't see why the two 6.3 V sources should have the same current handling capability. As long as the current capability of each source is high enough (so for 5 x 1625 that will be 5 x 0.45 A = 2.25 A as the minimum current capability per 6.3 V source) I think you will be fine.