In Reply to: RE: conjunctive filtering posted by dcal40@aol.com on August 1, 2016 at 10:58:40:
I think that circuit would be sensitive to the specific output transformer, and probably to the speaker as well.
It looks to me like it is there to assure stability in the presence of feedback. With beam tetrode or pentode, the plate impedance is very high, so the voltage gain increases at high frequencies due to the transformer's leakage inductance and/or the inductive component of the speaker impedance
Normally if the tube is triode-wired the plate impedance is low so this is not a bad problem. Also most SET designs have no feedback.
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Follow Ups
- RE: conjunctive filtering - Paul Joppa 13:02:38 08/01/16 (2)
- RE: conjunctive filtering - dcal40@aol.com 16:08:16 08/01/16 (1)
- taming "ragged frequency response" - Frihed89 00:01:54 08/02/16 (0)