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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Dynakitparts.com: who makes their transformers? posted by LowRedMoon on October 7, 2016 at 18:39:13:
Adam,
Sherwood S5000-II O/P "iron" does not have UL taps. You certainly can make a pentode mode "El Cheapo Grande", which will yield 30+ honest WPC. Make certain that you regulate 7868 g2 B+.
The TungSol data sheet for the electrically equivalent 7591 provides all sorts of good operating condition info. Employ combination bias to work around the "fixed" bias grid to ground resistance limit. "Standing" each pair of O/P tubes on a 100 Ω/470 μF. self bias network provides a convenient test point for setting "idle" current. Please notice that only 1 bias set trim pot. is needed in each channel.
If the UOS 7868s you have test strong, consider selling them and buying current production EH 7591s from Jim McShane. Cross check the prices for current production 7868s and 7591s and you'll understand why I make the suggestion.
If you need a new power trafo, AnTek definitely has affordable candidates.
Eli D.
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- RE: Dynakitparts.com: who makes their transformers? - Eli Duttman 19:47:22 10/07/16 (0)
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