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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: RE: Why the big discrepancy between anode plate and screen grid? posted by garymuffley on August 4, 2016 at 08:23:50:
Not only separate, but regulated.
Screen grid to cathode potential, not plate to cathode potential, dominates in pentodes and beam power tetrodes. Regulation of g2 B+ reduces the amount of open loop IM distortion generated. NFB, of whatever form, works best when it has comparatively little to do. NFB, of some kind, will always be needed with pentode mode "finals" to realize an acceptable damping factor. However, less is definitely more, when it comes to open loop distortion.
FWIW, the most effective implementation of ultra-linear (UL) mode "finals" requires O/P transformers that contain a separate screen grid winding. That separate winding allows g2 B+ to be regulated and benefits from more than 1 source obtained.
Eli D.
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- RE: Why the big discrepancy between anode plate and screen grid? - Eli Duttman 10:16:52 08/04/16 (0)
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