[Amps] Alternative cooling strategies for SB-220?

[Carl]

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 at cox.net>
To: "Colin Lamb" <k7fm at teleport.com>; "Roger" <sub1 at rogerhalstead.com>; 
"Carl" <km1h at jeremy.mv.com>
Cc: <amps at 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 at teleport.com>
> To: "Roger" <sub1 at rogerhalstead.com>; "Carl" <km1h at jeremy.mv.com>
> Cc: <amps at 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
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>