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In Reply to: Fisher X-202-B posted by NoTransistors on January 31, 2004 at 19:23:59:
The 7247/12DW7 is essentially 1/2 of a 12AX7 and 1/2 of a 12AU7 in the same bottle. I recall that EICO claimed the tube was developed at their request. It is pretty common in Eico gear, and Dynaco used it in the ST35.NOS is pretty easy to locate, and the 12AT7 has the same pinout - but is otherwise a poor substitute. I'd suggest you pick up the real part.
I also believe the EI still has them in production.
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Follow Ups
- Re: Fisher X-202-B - Gary Kaufman 01/31/0419:27:48 01/31/04 (1)