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In Reply to: Why the SL7 may sound "better"... posted by Lew on May 13, 2002 at 08:26:34:
Lew,Your analysis is correct and the cascoded *SN7 *should* sound as good or better than a single-stage *SL7 as a current source.
But.....
I've heard some designers say it is a bad idea to parallel triodes, regardless of how well they are matched.
Also, a cascode CCS circuit can be viewed as a feedback circuit extended further in space (and with more microphonic parts) than a single-stage version.
Thus, it is still an open question to me whether Ralph's cascode (for the purpose of increasing power supply immunity), 4-Zener CCS, whether using *SN7 or ECC99, is sonically superior to a single-triode, 3-Zener *SL7 CCS.
I suppose this is one of those questions that will never be resolved (and that makes this forum so interesting)...I can't imagine building a pair of amps with switchable CCS stages to find out.-Al
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Follow Ups
- Re: Why the SL7 may sound "better"... - Al Sekela 09:35:11 05/13/02 (5)
- cascode = parallel triodes? (I think not.) - Lew 15:06:14 05/13/02 (3)
- Re: cascode = parallel triodes? (I think not.) - Al Sekela 15:53:08 05/13/02 (2)
- I should have qualified my analysis.... - Lew 12:09:03 05/13/02 (0)
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