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Old 01-13-2015, 08:43 AM
dieseljeep dieseljeep is offline
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Join Date: Jul 2010
Posts: 6,311
Originally Posted by Biscuithead View Post
It looks like the CRT is a replacement from 1963.... from what I found online about the 21ep4b. I still can't find a pin diagram to tell me which is the filament...
Heater pins are 1 & 12. Each side of the locating key. The 21EP4 is a cylindrical faced CRT and rather uncommon. Stromberg-Carlson seemed to use them alot.
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