"Martin Eastburn" wrote in message
...
I used to use a high power carbon pile in the labs.

Big and larger than 4 lunch boxes. The carbon is compressed or
released to change the resistance.

I think 50 ohm would be a bit hard to come by. Ours was 1 ohm.

Martin

I just measured a piece of carbon fiber insulation about .75" x 1.5" x
10" long at under 2 Ohms.
jsw