Dick, was ETO the reason for the YC -156 then or was another company
behind that modification?
Carl
KM1H
----- Original Message -----
From: "Richard W. Ehrhorn (W0ID)" <w4eto@verizon.net>
To: "Jim Tonne" <Tonne@Comcast.net>; "Amps @ Contesting.com"
<amps@contesting.com>
Sent: Tuesday, April 07, 2009 1:24 PM
Subject: Re: [Amps] Fw: "Y" tubes - the real scoop
> 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@Comcast.net>
> To: "Amps @ Contesting.com" <amps@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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>> http://lists.contesting.com/mailman/listinfo/amps
>
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