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In Reply to: PP 6L6 Small Signal Circuitry posted by Eli Duttman on May 6, 2016 at 11:21:27:
Most HK amplifiers (other than Cit II and V) use a different topology than the designs you've mentioned. They employ a Cathodyne phase splitter attached directly to the output stage. In this regard, they're similar to Dynaco. Even then, they differ in that the power amp block uses a triode, rather than a pentode, ahead of the splitter. I much prefer a Cathodyne to be followed with a buffer, but I'm not going to change this when I rebuild the A500. The feedback network is more complex than many, and IME it works extremely well with the HK iron. With NOS 6L6s, I measured 0.4% THD at 20W and less than 0.1% THD at 5W. Those numbers indicate to me the 6L6s are at home in this design, and I'm hoping to do a little better in the final build. My intent is to create an all-octal amp, so the 12AX7 and 12AU7 will be replaced with a 6SL7 and 6SN7 respectively.
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Follow Ups
- HK Amps - Triode_Kingdom 19:25:15 05/06/16 (2)
- RE: HK Amps - Eli Duttman 20:04:30 05/06/16 (1)
- RE: HK Amps - Triode_Kingdom 22:12:29 05/06/16 (0)
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