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

[Richard W. Ehrhorn (W0ID)]

Agree with all comments; Ed, especially, is right on.

Unlike Ed's case, for ETO's 2nd generation MRI linear amps we used 
3CX15000B7's modified with a smaller (5 kW)cooler. Reason was need for ~25 
kW very linear PEP w/relatively low duty cycle & dissipation.

Those tubes, as well as 8877's selected/tested for specific parameters in 
earlier, smaller MRI amps, were "Y" designated.

Dick   W4ETO/W0ID




----- Original Message ----- 
From: "Jim Tonne" <Tonne at Comcast.net>
To: "Amps @ Contesting.com" <amps at contesting.com>
Sent: Monday, April 06, 2009 2:00 PM
Subject: [Amps] Fw: "Y" tubes - the real scoop


>
> 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:
>
> -----
>
> 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
>
> -----
>
> 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
>
> -----
>
> I think these comments can be construed as
> The Rest Of The Story!
>
> - Jim WB6LD
>
>
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