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In Reply to: RE: Low-Z SE OPTs? posted by Triode_Kingdom on August 05, 2014 at 08:30:56
It's funny to me - some people hate cathode caps, some hate interstage coupling caps, some hate output coupling caps, some hate power supply caps.
To me, they are all in the signal current loop and are all potential sonic issues. In a normal cathode follower, all of the signal current goes through the power supply (most through the last capacitor), so that would be the likeliest culprit from my perspective. But to each their own!
Follow Ups:
"In a normal cathode follower, all of the signal current goes through the power supply (most through the last capacitor)..."
It's not clear to me that a misbehaving cap that creates minor anomalies at the anode has the same effect on a follower as it would in a common cathode stage. That aside, dealing with the issue of caps in general is somewhat a matter of degree. In this circuit, the last PS cap can be a much smaller value for a given frequency response than the output coupling cap required to drive a low-Z OTL load. That makes the use of a film cap - rather than electrolytic - more practical. Hopefully, that will evidence itself in the form of truer sound. :)
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Buy Chinese. Bury freedom.
You are correct; the power supply is inside the feedback loop. If you stick to this plan, it looks like you will need a custom transformer.
Looking forward to your results!
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