Amps
[Top] [All Lists]

Re: [Amps] Alternative cooling strategies for SB-220?

To: "'Carl'" <km1h@jeremy.mv.com>, "'Hardy Landskov'" <n7rt@cox.net>, "'Colin Lamb'" <k7fm@teleport.com>, "'Roger'" <sub1@rogerhalstead.com>
Subject: Re: [Amps] Alternative cooling strategies for SB-220?
From: "Mike using AT&T" <k9mk@flash.net>
Date: Thu, 17 Dec 2009 15:48:47 -0600
List-post: <amps@contesting.com">mailto:amps@contesting.com>
The 70V uses a 3CV1500A7.  

Instant on and water cooled, it does not get better than this...

Mike
K9MK



-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Carl
Sent: Thursday, December 17, 2009 2:29 PM
To: Hardy Landskov; Colin Lamb; Roger
Cc: amps@contesting.com
Subject: Re: [Amps] Alternative cooling strategies for SB-220?

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
> 

_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps


_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps

<Prev in Thread] Current Thread [Next in Thread>