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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Hey Lynn posted by Alan Breece on January 23, 2002 at 07:47:08:
That little trick requires a fully symmetric PP stage - no symmetry, no workee.I should although it looks like something for nothing in theory - wow, cancellation of Miller capacitance, much higher slew rate, less reactance for the driver, just a potful of good things. The entire premise of neutralization is that both tubes maintain the same gain and track each other exactly - well, that doesn't really happen, especially at high frequencies. In practice, neutralization falls apart during clipping and any onset of Class AB operation, and makes things much worse than before, with nasty little bursts of near-oscillation.
This is unfortunate, since the basic Western circuit is *so* stable otherwise, nothing like the Williamson 15 years later, which would oscillate if you didn't use an ultrawideband Partridge or Peerless 20-20 Plus transformer.
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- Miller C Neutralization - Lynn Olson 01/23/0223:19:33 01/23/02 (0)
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