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substitute tub 7A4 vs XXL
codefox1
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#4

06-12-2011, 01:17 PM
Agreed. Some of these are microphonic, Just like the 6C5/6J5 that are the of the same family, sort of, but as an oscillater or IF amp, it shouldn't matter too much. Anyway no harm in trying. Switch 'em around for best performance.
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Messages In This Thread
substitute tub 7A4 vs XXL - by gennet2 - 06-12-2011, 06:45 AM
Re: substitute tub 7A4 vs XXL - by John R - 06-12-2011, 11:45 AM
Re: substitute tub 7A4 vs XXL - by Carl Travis - 06-12-2011, 12:38 PM
Re: substitute tub 7A4 vs XXL - by codefox1 - 06-12-2011, 01:17 PM



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  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration