[Amps] Fw: "Y" tubes - the real scoop

[Jim Tonne]

Gents:

I made a comment several days ago that I had been told
decades ago while I was at Continental that Tom Yingst
was behind the "Y" series of tubes from Eimac.  It turns
out that I was being fed a story!  Two fellows who know
both the scoop and also Tom have replied to my off-list
inquiry.  Here are their replies, which I think are definitive:

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I have some info from the man himself, Tom Yingst.   He says that the Y
 designation got started sometime back as a notation for a standard tube
 modified for a particular customer's (OEM) requirements.   He does not 
know
 if the Y stands for Yingst and my other sources indicate not.   I learned
 also from one of my other sources that YC meant California (San Carlos)
 built and YU meant Utah (Salt Lake) built.      gw

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 I agree the "Y" was a tube modified for a particular customer's (OEM)
 requirements.  In some cases they were just selected for parameters.
See this link: http://www.cpii.com/docs/datasheets/76/YC-236.pdf
In some cases we had a larger Anode cooler installed.
In some cases we had the filament changed to "Meshed" etc.
Ed

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 I think these comments can be construed as
The Rest Of The Story!

- Jim WB6LD