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In Reply to: Re: Curious why the O.T.L. board moves so much slower than the S.E.T. board. posted by Lew on June 29, 2005 at 12:35:22:
Maybe I'm too close and familiar with the Joule OTL's, but I would think that just looking at the tube compliment and knowing its single eneded input, circletron amp would tell a fair amount about the basic circuit, would it not????Jud is not much of a internet guy, being the old skool gentleman that he is :-) , so you will not be seeing him posting on internet forums to discuss things such as this but I have seen him talk with interested folks at shows about various design aspects of his amps.
Happy Listening,
Rich Brkich
Retailer & Audio Asylum Industry Liaison
Follow Ups:
And his affection for the mu-follower is not a secret either. I wonder whether the amps use NFB at the output and if so how it is implemented.
There is variable feedback at the output... [ knob on top of the amp - upper right corner of the picture shown in this post :-) ]. Feedback is local I believe.
Happy Listening,
Rich Brkich
Retailer & Audio Asylum Industry Liaison
And I suppose the power transformer(s) are toroidal; the flat disc shape would be hide-able inside that massive chassis, under the circuitry.
Yes, multiple transformers per monoblock... at least (big) one is torridial... plus there is the variac, then I think one other smaller transfromer (which I can't recall if its torridial or not) plus another little transformer for the digital meter power supply.Compared to what you find in most (tranformer output) tube amplifiers, the power supply design is a good deal more complex! :-)
Happy Listening,
Rich Brkich
Retailer & Audio Asylum Industry Liaison
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