Yup,
I'd imagine it would work too if it will pinpoint the anode surface as I'm not
sure what the minimum distance is and the spot size is it measures. The reason
being is I figure the anode body would probably be some hotter than the
radiator itself, by how much I'm not sure. That is for one with air flowing
through the radiator. One running without any air, the anode and radiator would
be close to the same temperature I would think. That I'm guessing by seeing
thermal images of other heat producing bodies connected to heatsinks and
cooling raidators. They were always hotter at the source and grew cooler
outwards from it. By using a thermocouple wire placed on the anode surface, one
could measure the anode temperature itself. One other way would be use Tempel
Stick paint markers. The paint starts to melt at a certain temperature. The
paint is available in different temperatures, how low a temperature I'm not
sure. They use it for heat treating steel and other uses. I would imagin
e they have something kind of low as some heat treating is done at pretty low
temperatures. Anyhow, you make a small mark on the part with the paint and
watch for it to melt as the heat raises.
I thought of buying one of the new IR thermometers but havent really read up on
them that much yet. I do remember they had a minimum and maximum distance to be
used at and the spot measurement grew with distance. I'll probably do a little
research on them now since you mentioned them.
Best,
Will
>
>
> 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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