hi all,

if you ever need replacement mineral oil for the dummy loads,
stop by the local veterinary supply house, the have it in
gallon bottles about $ 12 or so, and no funny looks.

It is used on the farm and for livestock so low cost.

cliff

Gregg wrote:

Behold, Ken Scharf signalled from keyed 4-1000A filament:

Gregg wrote:
I find myself a TV tech, getting dumped on with older HAM rigs for
repair by newbie licenced HAM's with no vacuum tube experience.

I am in need of a decent 50 or 100 watt dummy load to properly align
the transmitters at full power.

I have stuff for trade or am willing to pay up to $20/USD for one
shipped to Canada, postal V0X 1X0.

Lemmie know if anyone can help :-)

My real email is geek at scorpiorising dot ca

Thanks all,

What you want is the Heath 'Cantenna'. These show up on ebay from time
to time. Back in the 60's 70's, and 80's almost every ham had one so
they are not very rare. They do have a small problem, the brass bands
that attach the resistor element to the unit break in half after many
years of use (either from metal fatigue or chemical reaction to the
'oil') and will have to be replaced. Small hose clamps may work, or you
will have to make your own from sheet brass. Also many of these were
filled with 'transformer oil' obtained from the local power company.
While this stuff had ideal thermal and electrial properties for the job,
it was a hazardous chemical that shouldn't be allowed to get on the
skin, or disposed of to seek into the ground water table. (CANCEROUS!).

An equivalent to the Cantenna is still being sold by MFJ Enterprises.

I had one of those! :-)

I used Shell Turbine Oil instead of the PCB stuff. Blew it on a 4KW 11M
linear a friend brought from Holland :-(

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca