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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: Need help to identify a 12bh7a tube posted by patony407 on December 11, 2006 at 18:52:23:
I suspect the 337 code suggests Zenith as the manufacturer and the 948 is probably the code for Wards.Zenith sourced a lot of tubes from Japan and others, but manufactured many of the tubes prior to the popularity of transistors. If it is an early tube it is probably a Zenith and if it is a 70s or so tube it could be just about anyone's. The six dots and the single plate with the seam sounds like a GE tube. Without a picture, I'm just making my best guess as a Zenith, sourced from GE and branded for Wards. Happened all the time...
Zenith probably had a contract to provide tubes for the Wards radios and Wards wanted their name on them. Zenith likely made some of the tubes and sourced out the rest and simply put their own code on the tube as well as the Wards code. GE tubes have etched codes in the glass and Zenith had to live with "the dots" on the glass when rebranding them prior to delivering the tubes and/or radios.
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- Re: Need help to identify a 12bh7a tube - Catch22 21:00:50 12/11/06 (0)
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