In Reply to: RE: both primaries in parallel and both secondaries in parallel posted by 1973shovel on May 19, 2012 at 17:15:05:
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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Follow Ups
- RE: both primaries in parallel and both secondaries in parallel - Eli Duttman 18:00:46 05/19/12 (7)
- RE: "you generate waste heat, but the tube heaters will not fail prematurely." - 1973shovel 07:38:46 05/20/12 (6)
- RE: "you generate waste heat, but the tube heaters will not fail prematurely." - Eli Duttman 19:22:28 05/20/12 (5)
- RE: "The 1st filter cap. can't exceed 20 mF" - 1973shovel 15:08:39 05/21/12 (4)
- RE: "The 1st filter cap. can't exceed 20 mF" - Eli Duttman 17:29:50 05/21/12 (3)
- Potato Masher - 1973shovel 05:18:05 05/22/12 (2)
- RE: Potato Masher - Eli Duttman 18:49:35 05/22/12 (1)
- RE: Potato Masher - 1973shovel 06:36:05 05/23/12 (0)