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Old 19th Sep 2020, 9:24 pm   #17
turretslug
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Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,385
Default Re: PX4 substitutions

Contemplating the sacrifice of any veteran toob may be painful, but the 7475/CV188 is fairly commonplace and not terribly in demand with a typically compact B4 base- and the device itself could then be treated as a wire-in reference if you don't like to contemplate discarding it! As any deviation from the original PX4 type is "unoriginal" anyway, perhaps a substitute consisting of B4 base to wired adapter bracket with small autotransformer and a B9a valve like a triode-connected 6BW6 could be fitted in somewhere unobtrusively. Functional, if hardly concours.
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