On Jul 20, 2005, at 1:12 AM, Will Matney wrote:
> Dick,
>
> I'm not saying it's a bad tube, and dont want none to think that. I
> just dont want anyone to undercool the tube so it will last. Who
> knows, the 4CX1500 may have an over-sized radiator too! About the only
> way to tell about the temp would be to use a thermocouple connected to
> the anode.
An IR thermometer would work.
> ...
>
> ----- Original Message -----
> From: PA3DUV <pa3duv@planet.nl>
> To: "Will Matney" <craxd@engineer.com>
> Subject: Re: [Amps] GU-84B Cooling
> Date: Tue, 19 Jul 2005 22:45:03 +0200
>
>>
>> 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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>
>
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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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