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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: Question from a student: posted by Lew on July 2, 2001 at 10:40:39:
> Kurt: I think I understand the need for the coupling capacitor between the plate of the output tube and the OPT on the "top" side of your circuit - to keep DC out of the transformer, but why don't you need a complementary one on the "bottom" side plate-to-OPT leg? <The DC current is completely blocked by one series-connected blocking cap, but it is true that the DC voltage from the bottom plate is not blocked. The DC voltage on primary from the bottom plate is blocked to the output by the transformer. It's really unnecessary. A second one is actually redundant, and I believe will do harm on two accounts: 1) another component in the signal chain is added which causes nothing but degradation; 2) If there were two DC blocking caps on the primary where would the voltage on the primary be established? Nowhere because now it is completely floating. A floating primary is a way to get static build-up problems - "snap, crackle, pop". Then you need some high value static draining resistor to ground to stop that.
Kurt
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Follow Ups
- Re: Question from a student: - Kurt Strain 07/2/0112:58:41 07/2/01 (1)
- Thanks. - Lew 14:09:14 07/2/01 (0)
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