That was the 1971 70V which used a modified 3CX1000A7. It was somewhat
troublesome and they soon added the 70A to the mix which used the regular
air cooled tube. A short time later the first of the 77 models came along.
Carl
KM1H
----- Original Message -----
From: "Hardy Landskov" <n7rt@cox.net>
To: "Colin Lamb" <k7fm@teleport.com>; "Roger" <sub1@rogerhalstead.com>;
"Carl" <km1h@jeremy.mv.com>
Cc: <amps@contesting.com>
Sent: Thursday, December 17, 2009 2:57 PM
Subject: Re: [Amps] Alternative cooling strategies for SB-220?
> There was an article in QST many years ago called "The Stanley Steamer"
> which described water cooled tubes. I believe ETO built an amp based on a
> water cooled tube that Eimac made that had 1500 watts plate dissipation.
> The principle being it takes 539 calories of heat to convert 1 gram of
> water at 100 deg C to vapor if I remember my thermodynamics correctly.
> 73 Hardy N7RT
>
> ----- Original Message -----
> From: "Colin Lamb" <k7fm@teleport.com>
> To: "Roger" <sub1@rogerhalstead.com>; "Carl" <km1h@jeremy.mv.com>
> Cc: <amps@contesting.com>
> Sent: Thursday, December 17, 2009 11:58 AM
> Subject: Re: [Amps] Alternative cooling strategies for SB-220?
>
>
>> Water Cooling:
>>
>> Jo Jennings, W6EI, installed a converted water cooled 4CX250 in the base
>> of his mobile whip. He converted. I think Eimac subsequently built some
>> water cooled version based upon the results. There was a writeup in CQ
>> or QST in the fifties.
>>
>> 73, Colin K7FM
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
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