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Old 02-24-2017, 04:18 PM
old_coot88 old_coot88 is offline
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Join Date: Sep 2009
Posts: 1,919
The very first thing I would do is verify that the H efficiency coil is intact. The coil form tends to crystalize over time which lets the windings go loose, detuning the coil. If that happens, you can't tune it for the required 'dip' in H output tube cathode current.

The coil form material that's most often affected is whitish, semi-translucent plastic. If the coil form is brown phenolic, yellow, or solid opaque white, it's probably OK.

If the eff. coil is busted it renders the set dead in the water until replaced.
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