Thanks to Jim and Chuck!
Definately non-inductive for this application, but the power rating
is, I don't know. I know it was used at a 5KW AM radio station for
some testing. I should have mentioned that the glass tubes look
like common florescent tubes....white in color with no hint of carbon,
etc. I would do some more examination but I sure don't want to risk
breaking one of them. They are now back in their case, sealed by a
"jillion" screws!!!
I looked at
https://theelectrostore.com/content/datasheets/kanthal_globar_resistors.p
df
Doesn't appear to be anything similar in appearance, but like Jim said
there's
lots of area for cooling. It could be that there's something inside the
tubes which can't been seen.
Unfortunately I threw away some electronic industrial catalogs from the
late 1960's
era. Oh! BTW, this dummy load was made by Bendix and it's called a
"Dummy Load Modulator". Not sure what the "modulator" reference means.
I do have photos if anyone wants a look.
73,
Charlie, N0TT
On Sun, 28 Jun 2020 12:01:58 -0700 jimlux <jimlux@earthlink.net> writes:
> On 6/28/20 11:43 AM, n0tt1@juno.com wrote:
> > Hello everyone,
> >
> > I recently aquired a "commercial" dummy load that I'm sure will
> handle
> > more than 2kw.
> > There are 12, 600-Ohm resistors in parallel that measure 50-Ohms
> with a
> > Ohmmeter.
> > The resistors look like frosted glass tubes with metal end caps.
> They
> > measure 9.5" in length
> > and 1" diameter. The number stamped on the ends is E9935R and
> their
> > vintage is late 60's. A Google search for that exact number
> turned up
> > nothing.
> >
> > Question: Does anyone know the power rating of these resistors
> and
> > what type of resistor are they?
>
> They might be non-inductive power resistors from Carborundum corp
> (now
> part of Sandvik, as I recall). I've got a bunch of them, although
> mine
> are grey or brown.
>
> They could also be a thin film resistor deposited on a ceramic
> substrate. Same idea - lots of area for cooling.
>
>
>
>
> >
> > I have photos.
> >
> > 73,
> > Charlie, N0TT
> >
> > _______________________________________________
> >
> >
> >
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> > TowerTalk@contesting.com
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> >
>
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