[Hallicrafters] SX-25 and Substitute for 6F6-G

[Fred Olsen]

Jon Miccolis wrote:

> I have a questions in regard to a viable substitute for a 6f6-G in a sx25...

Jon, disregarding originality, which of course would require the 6F6G 
only, the 6F6 and 6V6 are rather different tubes.  The basing is 
essentially the same but the 6F6(and variations) is a power pentode and 
the 6V6() is a beam power tube.  That isn't necessarily a hold point but 
there are other differences.  I don't know the SX-25 but if it runs more 
than 350V B+ on the output stage you're over the rating of the 6V6, and 
that much is a rerating only for late-production tubes.  The 6F6 will 
take up to 375V.  Other differences indicate that the curves of the two 
aren't extremely close.  The 6V6 does use less heater, at 450mA versus 
700mA for the 6F6.
(From: RCA RC-30)

The Sams sub book does not show any sub for the 6F6 other than its own 
variations.  The 6V6 would 'work', more or less, but it is not a 
recommended sub.

Good luck,
Fred
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