The discharge gave off a distinct zap.  I was sceptical (and concerned)

I also got a small spark when earthing various points on the back of
the tube. ( I was been over cautious as I just hate getting bitten.)
I put this down to the fact that I only discharged the tube for a
split second and remembered later that I should give it a little time.

Roger, thanks for the advice with the PTC3.
I found PTC3 earlier today in a  westec electronics related catalogue
but failed to find any specs on them to see if they were similar to
the MZ73G 20RM.

I dismantled the PTC and found that a large, once white  button sized
disk was badly burnt on one side.  I measured between the faces of the
disk at points that looked ok at about 50 ohms, so I thought I would
give it clean with fine paper.

Cleaning gave the surfaces a very smooth graphite colour look but the
resistance then shot up to the 20 K ohms so I guess I made it worse..

I will get a replacement and update with the results.  Yes, TV repair
shops are closing down and harder to find.

Cheers Justin
> Just read your next email =A0... =A0You can use a PTC3 from WES Components
> http://www.wescomponents.com/ =A0or just call into any local tv repair sh=
op

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