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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: adapting a design to a different opt posted by vinnie2 on September 25, 2017 at 13:44:12:
Regulating g2 B+, at a fraction of anode B+, deals with the lack of UL taps. Unfortunately, the 125E is completely inadequate. You need magnetic headroom to support the GNFB loop. Also, the 125E has limited low freq. extension. The 125E's core will saturate, if used in that circuit.
Edcor's CXPP25-8K will allow you to use that setup, with minimal fuss. The proper value of the phase compensation cap. (1000 pF. as drawn) has to be determined, by experimentation, at the bench.
Eli D.
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- RE: adapting a design to a different opt - Eli Duttman 16:07:10 09/25/17 (0)
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