Thread: 1939/40 Philco model# 40-125
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Old 03-26-2007, 04:09 PM
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Tom Bavis Tom Bavis is offline
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Join Date: Jun 2002
Location: Macedon NY
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5Y3 and 5Y4 are the same except for the basing... Philco didn't want you to buy tubes from the "enemy" (RCA), so Sylvania made the 5Y4 for them. I have a few, both G and GT style. Probably mixed in with my 5Y3s, keeps things interesting...
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