Broskie "Unbalancer" - transformer specifications
I'm currently in the process of soldering Broskie's "Unbalancer" PCB:
On pages 13 and 18 he specifies what sort of secondaries are required for the transformers, however I am a little confused as to how I need to specify the windings to the transformer manufacturer (it is an r-core type).
The input tubes I am using are 5963 tubes, whilst the output tubes are 5965. Hence in both cases the closest recommendation as per the chart on page 13 of the manual is the 12AU7 - with a B+ of 240V. And an AC secondary of 330VAC. However on another page he specifies the following:
The power supplies require an external power transformer(s) with two secondary windings (120Vac to 260Vac and 6.3Vac to 12.6Vac).
Presumably he is assuming that the 330VAC is centre tapped?
The r-core manufacturer has asked for a specification in the following format:
60 - 0 / 60 - 0 each 150ma = 300ma
6.3 - 0 / 6.3 - 0 each 1.5A = 3A
For the Unbalancer using 12.6v filament tubes - would this be the correct voltage specification?
330 - 0, 1 Amp (200mA for each tube)
12.6 - 0, 4 Amps (say, 1 amp per filament)
The Hammond looks good but may be overkill.
A custom wound r-core is probably about half the price and hopefully with those specifications will supply enough juice!
You don't need 400W power transformer!!!!!
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