UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Welsh Anorak · 2nd Jan 2007, 12:58 pm

Hi
If you want to prove the point (for your own interest only), connect three high-value resistors (say 100k) to each cathode on the crt base and connect the free ends together. Then you can sit back and watch a muddy green picture!
I agree with Danny - rejuvenation just doesn't seem to work with these Trinitrons, and shorting the resistor out offers little improvement.

Sony didn't seem too bothered - when Hitachi brought out a duff tube in 1980 - the 'instavision' directly heated cathode on the CBP220 - they were replacing them FOC for six years - and we got paid for doing the job!

Glyn

2nd Jan 2007, 12:58 pm	#6
Welsh Anorak Dekatron Join Date: Apr 2005 Location: North Wales, UK. Posts: 6,925	Re: TV adjustments - another quick NOOb question Hi If you want to prove the point (for your own interest only), connect three high-value resistors (say 100k) to each cathode on the crt base and connect the free ends together. Then you can sit back and watch a muddy green picture! I agree with Danny - rejuvenation just doesn't seem to work with these Trinitrons, and shorting the resistor out offers little improvement. Sony didn't seem too bothered - when Hitachi brought out a duff tube in 1980 - the 'instavision' directly heated cathode on the CBP220 - they were replacing them FOC for six years - and we got paid for doing the job! Glyn