In Reply to: RE: Heathkit W-6 posted by Crazy Dave on April 7, 2015 at 08:15:49:
"Is this circuit more or less stable than a traditional 6SN7 Williamson without the CF? (I suspect less.) will the traditional 6SNZ Williamson drive PP KT88's/6550's sufficiently?"
The number of RC poles in the W-6M is the same as in a "textbook" Williamson setup. Therefore, no significant difference in stability is present.
A "routine" 2X 6SN7 Williamson setup is quite capable of driving KT88s. OTOH, the W-6M is Class "AB2". That's good for a bit of extra power and immune to blocking distortion.
Overall, the OEM W-6M is a fairly decent effort. A corner was cut in omitting a PSU choke and the gain structure (IMO) could have been thought out better. The weaknesses are shored up easily enough and I'd be glad to own a pair.
Eli D.
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Follow Ups
- RE: Heathkit W-6 - Eli Duttman 09:00:50 04/07/15 (1)
- Great information as usual, Eli! - Crazy Dave 09:44:27 04/07/15 (0)