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RE: both primaries in parallel and both secondaries in parallel

Both bucking and boosting are fine, in an appropriate place. For the record, a Triad VPS24-1800 is the current recommendation for "12"
V. heater power and B+ boost, in scratch built "El Cheapo". ;>)

If you use a secondary winding of the Triad trafo you have to buck the other secondary down, you can access only 1/2 the current of the 2 secondaries in parallel.

If that trafo (with the secondaries in parallel) comes in too "tall" install a bleeder resistor across the composite to get the total draw right. Yes, you generate waste heat, but the tube heaters will not fail prematurely.


Eli D.


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