Guys, c'mon. Bird 8201. $200 used, 500W continuous forever, 5kW short
term. Air cooled, oil (mineral) filled, parts available, QC connectors
like on our Model 43 meters, 1.25:1 max out to 2.5GHz, and it'll outlive
all of us. Sure, I can make mine slightly warm to the touch txing RTTY at
the legal limit into it, but otherwise it stays cold to the touch doing
anything else.
-Bob N3XKB
On Sun, Feb 21, 2021 at 1:46 PM MU 4CX250B <4cx250b@miamioh.edu> wrote:
> My instinct is that mineral oil would be a better coolant than
> distilled water, with no corrosion issues. You can buy it at any
> pharmacy, and while it isn’t rated at quite as high a temperature as
> transformer oil, it works quite well. I used it in a Cantenna for 30
> years! As I recall, it was recommended byHeathkit as a substitute for
> transformer oil.
> 73,
> Jim w8zr
>
> Sent from my iPhone
>
> > On Feb 21, 2021, at 1:35 PM, Geert Jan de Groot <pe1hzg@xs4all.nl>
> wrote:
> >
> >
> >> Is it possible to use distilled water in a hb dummy load ?
> >> DL consist of 4 x 200 ohm globars, wired in parallel..in an 8 gallon
> container.
> >> I welded 4 x 3 inch OD thick wall Alum pipes together, 2 stacked
> above 2.
> >> One resistor resides dead center in each alum pipe. Each resistor is
> a
> >> new globar type SP, 12 inches long x 1 inch in diameter.
> >
> > Personally, I'm using the Ameritron ADL2500, which is 4 hefty resistors
> in a case with a fan. I modified it so it automatically switches the fab to
> reduce the noise.
> >
> > No leakage, no corrosion, no mess if I drop it or I kick it. Much
> lighter. No dangerous oils, and my shack doesn't smell like a chip shop
> when I'm doing some testing.
> >
> > 73, Geert Jan PE1HZG
> >
> >
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