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In Reply to: RE: Building a SET amp, but not for full range posted by hvbias on March 24, 2015 at 08:09:26
The easy choice here is to go parallel feed, then you can actually control your roll off by sizing the parallel feed cap. If you don't do that, you'll have to rely on your winder to get it right the first time, which may be a bit of an issue.
In addition to this, if you ever decide to sell the amps, just plop in a bigger pair of caps and you can market said amplifiers as full range units.
Follow Ups:
He has Quad ESL63s according to his profile..Wouldn't he need at least a 10 watt SET? Bankpuku is running a 27 watt PP design full range on his ESL63s but how much power can you get from a parallel feed design?
Nobody ever went broke underestimating the intelligence of the American public
H. L. Mencken
My profile is a bit out of date, only the speakers and TT source remain. But these amps will not be for the Quads, they are for another living room setup with high efficiency full ranger listened to in somewhat near field.
The amp will be series feed. I was not a fan of any parafeed amp I've heard, though they all used solid state CCS loads not plate chokes.
A solid state CCS as the plate load for an output tube is a bit difficult to implement because of the heat. Could you describe how it was accomplished in these amps?
ray
These were all headphone amps using high transconductance triode or pentode wired as triode. Not that difficult to do a SS CCS with these sort of preamp tubes, ~ 2" tall heatsink is plenty for the IXYS CCS part.
Parallel feed actually makes higher power SET possible by splitting the OT duties, designs beyond 20 Watts are certainly possible.
I know there are a lot of SET amps now that can run on ESLS and Maggies when biamped especially but that's good to know about parallel feed.
Nobody ever went broke underestimating the intelligence of the American public
H. L. Mencken
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