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In Reply to: RE: choke coupled outputs posted by elblanco on April 20, 2015 at 20:15:51:
I'm not a big fan of these direct-coupled output schemes. However, I think low power aficionados (15W or less) have long overlooked the benefits of the inductively-coupled cathode follower. Rather than using huge numbers of parallel tubes to achieve a match, it's much more reasonable to use, say, two 6AS7s and a matching transformer. The transformer would not only require a much lower turns ratio than anode-coupled designs (i.e. improved frequency response), but by virtue of the reduced impedance transformation, less driving voltage at the grids of the followers. I believe followers in this configuration could be coaxed into producing as much power as their anode-coupled counterparts, and they would do it in a much more linear fashion. Unfortunately, the rush to produce ever greater output levels in the '50s and '60s completely overwhelmed any desire to research this topology. To the best of my knowledge, no one has ever made the requisite transformers for this service. Really a shame.
Edits: 04/23/15 04/23/15
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Follow Ups
- Inductively-Coupled Cathode Followers - Triode_Kingdom 06:13:31 04/23/15 (3)
- RE: Inductively-Coupled Cathode Followers - Tre' 19:45:25 04/28/15 (0)
- RE: Inductively-Coupled Cathode Followers - mqracing 11:39:44 04/23/15 (1)
- RE: Inductively-Coupled Cathode Followers - Triode_Kingdom 05:50:05 04/24/15 (0)
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