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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: Design philosophies posted by Triode_Kingdom on April 19, 2015 at 18:43:34:
There is actually very little global NFB in the Cit II. Most of the 31 db of NFB is either the unbypassed V1/V4 voltage amp cathode resistors or one of the multiple NFB "short" loops used in the driver/PI and from the plates of the output tubes back to the drivers.
For some reason (senior moment?) I can't recall the exact number - but it's single digits, like 5 db IIRC.
BTW, the Cit V is not U/L, it's pentode. As a result, improving the screen supply regulation is a positive step. Also, unlike the Cit II most of the Cit V NFB IS global.
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Follow Ups
- RE: Design philosophies - Jim McShane 19:44:24 04/19/15 (1)
- RE: Design philosophies - Triode_Kingdom 05:56:04 04/20/15 (0)
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