Quote:
Originally Posted by miniman82
To add to the mystery, this tube has no neck weld which would tend to indicate it was rebuilt. But the base did have a 274 EIA code on it which is RCA.
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Every early color set that I've seen, that used a 21AX CRT, that CRT had a EIA 274 on it. That was a GE, Hoffman, Motorola and an Admiral. It had the OEM brand name on it, with a 274 EIA.
IIRC, Sylvania was the main supplier to Sears for their replacement tubes. The OEM tubes were made by several different Mfg's.
