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In Reply to: Tube ID please... posted by popsy on July 6, 2016 at 16:33:09:
A tube tester can show the difference between a 12AX7 and 12AU7 - plate structures are the same; the 12AX7 has a closer grid spacing inside.
Eye tube is probably EM80 or EM85 - the latter has gotten hard to find. But the cathode stains might mean it's worn out...
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- RE: Tube ID please... - Tom Bavis 07/7/1613:03:17 07/7/16 (0)