Varister wanted - Videokarma.org TV - Video

rcafan · #1 09-29-2010, 08:41 PM

Has anybody got a varister for my CTC9, 70 ohm cold and 0.5 ohm
hot or a idea for replacing. (its R193 in the 117V input.
Thanks

Findm-Keepm · #2 09-29-2010, 10:32 PM

My Workman guide (sorry no date) says it's replaced by a Workman FR.49, a .49 ohm hot thermistor. No data in the guide, just the "hot" resistance.

Oneida and GC also marketed a line of thermistors, perhaps someone has one hiding somewhere.

Else, you may be able to find a GE Sensing Systems thermistor to work - Mouser sells these. A CL-80 comes close (47 ohms cold, .5 ohms at 100% rated current of 3A)

Or try and find the original RCA...

Cheers,

oldtvman · #3 09-30-2010, 06:49 AM

those are on sale on ebay under electronic parts

rcafan · #4 09-30-2010, 04:00 PM

Found it at Moyer in PA. Did not see right one on Ebay. Now, back to
work on the CTC9. The set is now working with good picture and
B/w tracking. Color has issue, Only red in picture shows up, Need
to get the scope out

Findm-Keepm · #5 09-30-2010, 07:29 PM

Just curious, did you find the exact RCA part or the Workman replacement?

Tried Moyers and eBay myself with no luck either!

Cheers,

rcafan · #6 10-01-2010, 12:26 PM

Moyer says they have the RCAFR291 in stock , the replacement for
the original #107291. They took my $4.80, I hope I get it.

Findm-Keepm · #7 10-03-2010, 08:49 PM

Quote:

Originally Posted by rcafan

Moyer says they have the RCAFR291 in stock , the replacement for
the original #107291. They took my $4.80, I hope I get it.

Thanks for the info - I grabbed two Workman FR291's from a different vendor. Moyers are good folks, and I've bought stuff from them before, but I needed a cheater cord and grabbed some caps and thermistors ($3.30 each) while I was at it.

Cheers,

rcafan · #8 10-04-2010, 04:13 PM

The thermistor arrived today and I was very supprised that
it was the original RCA pack with the RCA number, I should
have ordered a couple

julianburke · #9 10-03-2010, 04:11 PM

It doesn't really matter what the "cold" resistance is as it should be high but linearly goes to almost zero ohms when hot. This is so the degausser can do its' thing before the tube lights up and then is effectively cut out of the circuit by shorting out the degaussing coil. I would say there are several varistors you could use with good results.