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In Reply to: RE: Tube revolution posted by J. Phelan on May 15, 2015 at 13:05:24
Oh, they were there but relatively not well known.
Follow Ups:
Roger would dis-agree with you ......... :)
The first paragraph is so full of factual mistakes I didn't read the rest.
Fact on that is wrong...there is no such thing as a "highly linear" transistor. Maybe he MEANS that they they are close to theoretical transistor perfection but that is not linear by any means. As it has been noted by a number of writers on the subject, MOSFETS (theoretically) follow a quadratic function and bipolar transistors have an exponential transfer function. Both are far from linear.
Boyk and Sussmann show clearly that even with perfect transistors you will have substantial harmonic distortion even when running Class A, which Sanders clearly does not. For MOSFETS the situation of going from A to B is much worse than for bipolars, which look kind of crappy either way. MOSFETS in Class A are pretty clean...until you add feedback and then weird things happen. MOSFETS in B are ugly, with or without feedback.
Given that Sanders either doesn't really know how transistors work or is speaking marketing speak from the get go doesn't inspire educated reading.
Yep ,there is some of all of dat and more in there, but cant argue , his Magtech amp works , i did look and looked again, still cant see how he is using a fully regulated PSU, dont see it in the case ...
Regardless, the amp is a good piece...
Regards
Edits: 05/26/15
Full regulation probably means only of the input and maybe driver stage. A fully regulated output stage will dissipate as much heat as the output stage itself.
My NAT has a regulated output stage...which is why it has 4 identical heat sink towers rather than only 2. It also weighs more than double the Sanders amp to make "only" 100 watts.
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