[QUOTE=DENNYDOG;2133583]Here is the modfied base of the RCA tube.
cool . . . looks like a DIY adapter
if you can, take a peek at the underside of that rectifier base . . . chances are, it's the stock 4 pin socket . . .
if so, it should be easy enough to score a (correct) 80 for the chassis . . .
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Main system: DIY KLH OB Line Arrays & Altec stuffed Karlson 15's, DOD active Xover; tubes on arrays, SS on Karlsons