4CN15 is a 4cx300A without the fins.
I have a tube which is a 8877 with out fins used in a VHF amplifier where it
fits into a silver plated copper pipe which is a 1/4 wave line.
Air was blow thru the tube at one end and vented thru holes at the other. It
was for pulse applications, an old MRI.
They ran it at reduced average plate dissipation.
73
Bill wa4lav
________________________________________
From: Amps [amps-bounces@contesting.com] on behalf of Carl [km1h@jeremy.mv.com]
Sent: Friday, May 09, 2014 11:12 AM
To: Kevin Stover; amps@contesting.com
Subject: Re: [Amps] Using computer CPU coolers on GI46b triode ?
Subject: Re: [Amps] Using computer CPU coolers on GI46b triode ?
> On 5/9/2014 5:40 AM, Jonathan White wrote:
>> Hi.
>> Can anyone care to give any thoughts on using this tube sold without
>> its
>> cooler, the seller said Russian hams were using CPU heat exchangers, with
>> cooling fans.
>> 73`s Jon G8CCL.
>>
> I'd like to see how they interface the CPU heat sink to the tube.
> One of the things that makes a CPU heat sink work is the fact that it is
> clamped, with some considerable force, to the CPU socket and the use of
> metal bearing heat sink compounds on two flat surfaces. Aren't the plates
> of ceramic/metal tubes domed?
>
> The heat sink on my quad core cpu is about four inches square of very thin
> copper fins soldered to copper heat risers (tubes) which are soldered to a
> flat copper heat spreader. The whole shooting match gets a 120mm speed
> controlled fan which blows air through the copper fins. This is an
> aftermarket heat sink. The ones that come with the processor are barely
> adequate.
>
> In my old overclocking days we used to lap grind heat sinks and CPU heat
> spreaders to make them as flat as possible. We'd get an Intel Pentium
> Celeron 300A running at 300 MHz overclocked to 450 MHz, a 50% speed
> increase. Of course Intel hated it because everybody bought the 300A's and
> overclocked rather than buying the much more expensive Pentium II 450
> processors.
>
> --
> R. Kevin Stover
> AC0H
I still have a P3 450 running at 605 MHz; built it when new and upgraded
parts as the years went by. Its on an ASUS MB with 4X 256MB P100 memory
running at 133 and has been solid as a rock on WIN 98, 98SE, and XP.
Its been in the BR for several years now running mundane tasks that dont
require the latest and greatest....Im not into games.
Getting back to tubes and amps Ive cut off anode radiators from the 4X150
and up sized tubes and 8122's and adapted them to other types. Copper pipe
has been used to make up size differences..
I can easily see boring a CPU sink as a simpler alternative as long as a
round silicone rubber chimney isnt required.
Carl
KM1H
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