(1) Tested Strong Amperex 6GB5/El500 Bugle Boy Tube.
Date Code AE1 X5F1.
This tube has magnoval pins (B9D base) which are a slightly larger diameter (1.27mm) than standard American novar pin diameters. Please make sure of which version you need because trying to jam magnoval pins into a standard novar socket will most certainly ruin your socket.
Tested on a calibrated Knight KG-600B tube tester with no shorts and no leaks where 50 is minimum pass/good with the following results:
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