Re: [Amps] Using computer CPU coolers on GI46b triode ?

["Carl" <km1h@jeremy.mv.com>]

Ive been using modified 8072's in a couple of NCL-2000's for a couple of 
decades; runn fine at 1200W or so CW/SSB. At $5-10 ea for NIB I cleaned out 
several 2 way radio shops when they scrapped all the tube gear or went out 
of business/estate sales.
Carl
KM1H


Subject: Re: [Amps] Using computer CPU coolers on GI46b triode ?


>  I once made a heat sink for 4 6AG7 tubes by drilling out a large block of 
> aluminum boring
> holes in it aprox. 1 in dia and using a tungsten tipped saw blade cut 
> slots for fins. Worked
> well. Somewhere I have some heat sinks for some 8072's ( 8122 without 
> fins) used in
> a 500 watt plasma generators. Some were made of sheet metal, and others 
> were machined
> blocks, both were forced air cooled, neither worked very well. The 
> manufacturer had to
> can the product. They were not reliable. At that time 8072's were much 
> cheaper than 8122s.
> I would not recommend use of heat pipes like those used in many computers. 
> A computer has
> to dissipate much less heat than a power tube.
>
> 73
> Bill wa4lav
>
> _______________________________________
> From: Amps [amps-bounces@contesting.com] on behalf of Joe Subich, W4TV 
> [lists@subich.com]
> Sent: Friday, May 09, 2014 2:17 PM
> To: amps@contesting.com
> Subject: Re: [Amps] Using computer CPU coolers on GI46b triode ?
>
> On 5/9/2014 11:12 AM, Carl wrote:
> > Subject: Re: [Amps] Using computer CPU coolers on GI46b triode ?
> >
> > I can easily see boring a CPU sink as a simpler alternative as long as a
> > round silicone rubber chimney isnt required.
> That may be possible with an old "block with fins" type heat sink but
> many of the newer ones use a relatively thin plate/heat spreader and
> tubes filled with a heat transfer fluid.  The tubes bend upward to a
> radiator in the normal air flow or with or have a fan mounted to the
> radiator.  Drilling/boring one of those would damage the heat tubes
> and render it useless.
>
> 73,
>
>    ... Joe, W4TV
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