Re: GEC BT336 possible tube change
Couple of things come to mind, check the HT when the picture is deteriorated, if it is low and the set is still using the finned selenium rectifier it may pay to change to a diode and 47ohm resistor.
Also monitor the CRT heater voltage to see if that drops, you may have a partial heater short.
__________________
Stephen
_________"It`s only an old telly"  ___
|