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In Reply to: RE: Coupling cap posted by Paul Joppa on February 12, 2013 at 16:14:20:
I try not to depend on "intuitive" circuit analysis too much, so I Spiced this to see exactly how signal current flows through the two configurations. You and Caucasian Blackplate are absolutely correct about the role of the power supply output cap in all this. Signal current through this cap virtually disappears in parallel feed when a (perfect) plate choke is used. What wasn't clear to me until now is exactly why the two types of amplifiers - when viewed as "black boxes" with no capacitive storage - would not make the same dynamic demands on the power supply in order to output the same AC signal. What's occurring is that energy storage in the parallel plate choke is being effectively substituted for the energy storage of the last power supply cap. Whether that's a good thing, I'm not sure. I think it's much more difficult to achieve good performance from a choke than from a capacitor. Interwinding capacitance, unwanted resonances, winding resistance etc. all combine to degrade sonics. OTOH, a CCS on the B+ side of the choke might alleviate most of those effects. I never build with a solid-state CCS directly attached to the signal path (such as the anode of a tube), but positioning it on the far side of a parallel choke might be very useful at some point. Thanks for pushing this issue, I learned something today. :)
Edits: 02/13/13
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Follow Ups
- RE: Coupling cap - Triode_Kingdom 06:27:47 02/13/13 (1)
- RE: Coupling cap - Paul Joppa 21:32:04 02/13/13 (0)
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