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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: Westinghouse 6GH8 posted by Thermionic27609 on June 4, 2009 at 20:26:54:
While Westinghouse in 1963 might have actually made your 6GH8 tubes, their receiving tube production ceased in the mid-1960's. Most tube makers cross-sourced tubes - one company would have a production run of type 6***
and the others would buy from them and just re-brand and market as their own.
Westinghouse in particular became a marketing house fairly early - especially tubes found in the Blue boxes - and sourced tubes "from everywhere". Westinghouse apparently licensed others such as Dumont (NYC)
to use their brand complete with blue boxes thru at least the late 1980's,
complicating things more.
Tuner service is more sensitive to tube variances than audio service, as inter-electrode capacitance and internal lead inductance become a part of the circuit at 100 Mhz. Finding a precise match to your original tube
is very difficult, made more so by drift in other circuit components over
45 years of use, storage., humidity et al.
Trial and error selection of 6GH8's might work, or a tuner realignment
with new tubes in place may be needed - if you have the proper instrumentation or can find somebody who has same. Try new tubes first
and see if that helps.
The 6GH8 was the "latest and greatest" member in the 6U8 / 6EA8
family - made for TV service in great numbers at a then-cheap price.
All should work "kinda" - what does the schematic call for, as there are minor differences between each.
TUBOS
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- RE: Westinghouse 6GH8 - tubos 06/5/0905:59:00 06/5/09 (0)
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