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Old 24th Feb 2021, 11:48 am   #167
Travellingwave
Pentode
 
Join Date: Jan 2021
Location: York, North Yorkshire, UK
Posts: 155
Default Re: My first telly TV22

So got it back on the bench

Looks like the line output stage has died - No line whistle no EY51 heater.

I have checked the voltage at the grid of the PL81 and get -10v wrt chassis - so I take it this means I have line drive - interestingly when I apply my DMM to the grid I seem to get a line whistle coming back (I think) nothing on the screen though - and I can probe and check the EY51 for life at the same time.

I have checked the windings of the LOPT for resistance and they seem somewhere near right though I know this proves nothing much as there coud be a shorted turn.

Any ideas what I can check to prove health of LOPT?

I have a NOS PL81 arrived just this morning.
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