Will,
In my twin tube GU84B amp one fan is used to pressurize the subchassis and
two axial fans to draw the air out.
With a B+ of 2900 VDC, from the 3 phase PSU the two GU84B tubes generate an
easy 6 kW of output. During normal (6 dB compressed) SSB transmissions the
exaust air stays below 55 degrees celcius.
Cheers, Dick Knol
PA3DUV
> ----- Original Message -----
> From: "Will Matney" <craxd@engineer.com>
> To: <amps@contesting.com>
> Sent: Tuesday, July 19, 2005 9:53 PM
> Subject: [Amps] GU-84B Cooling
>
>
>> On a webpage somewhere, I cant remember now where, I read about the
>> GU-84B (4CX1600) having an undersized radiator. I think it was on a
>> Russian amateur website. What I had read was this tube was actually
>> designed for running in a missle by the Russians, and was designed for a
>> 1 time use. So, they undersized the radiator a good bit because of space
>> limitations. They were making the comparison to a 4CX1500's radiator size
>> being larger in the discussion. However the guts of the GU-84B supposed
>> to be really good. So this brings the delima of how to cool it so one
>> would get a long life out of it. One way would be add some sort of extra
>> aluminum heat fins, or some made of brass, with fins sticking out to
>> catch more air, thus increasing the overall surface area. The only other
>> way would be to increase the amount of air flow and volume over the fins
>> that's there. When doing this though, the noise goes up from the blower.
>> However, if one is going to dealve into using the GU-84B, I'd s
>> uggest looking into this and compare the sizes between its radiator and
>> the one for the 4CX1500. Even though the tube is cheaper than some
>> others, it's still expensive if you have to re-tube all the time. If I
>> can remember where I seen this, I'll post the link.
>>
>> Best,
>>
>> Will
>>
>> --
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