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Old 1st Oct 2020, 6:35 pm   #66
Heatercathodeshort
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Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
Default Re: My first foray into Old model TV repairs.

I forgot to add. My example burst into oscillation after a few minutes use, blanking out the picture and sound. The I.F. decoupling capacitors used by Thorn are high quality .002uf ceramic types, that is all but one. The screen grid decoupler of the EF80 R.F. amplifier was the familiar light brown crunchy type and yes it was O/C. Replacement cleared the instability and gave a 100% improvement in gain. J.
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