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In Reply to: RE: Starting a Heathkit AA-32 after 40 Years. posted by Jim McShane on August 13, 2012 at 15:48:07:
Jim,
The 6GW8 data sheet shows the triode section as being pretty much the same as that found in 12AX7s. The power pentode seems to resemble a hobbled 6BQ5. The OP rates (IMO) to get away with 6V6 class tubes operated conservatively.
Does the idea of using the OEM filament winding to energize a proper DC supply for the small signal tube heaters and the installation of a 12.6 VAC filament trafo to feed 12AB5 "finals" appeal to you? The "real estate" to add 2X Noval sockets, for power section small signal tubes, would be easier to find than that needed for 4X Octal sockets. If space is badly constrained, a single Noval socket could be added to accommodate the voltage amplifiers of each channel and MOSFETs used as the "concertina" phase splitters.
Eli D.
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Follow Ups
- RE: Starting a Heathkit AA-32 after 40 Years. - Eli Duttman 17:44:00 08/13/12 (0)