UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Oh no

Heatercathodeshort · 21st May 2010, 6:54 pm

Interesting Dom,
I expect you have already checked/replaced it but R117 100k and R120 150K are worth a check. These are in the anode and screen supply to the line oscillator and may have gone high reducing the drive. [Pye V4 circuit] An O/C R125 470k [grid leak] can give some odd symptoms including a 'wasp waisted' effect on the picture shape. Just a thought. J.

21st May 2010, 6:54 pm	#89
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: Oh no - another V4! Interesting Dom, I expect you have already checked/replaced it but R117 100k and R120 150K are worth a check. These are in the anode and screen supply to the line oscillator and may have gone high reducing the drive. [Pye V4 circuit] An O/C R125 470k [grid leak] can give some odd symptoms including a 'wasp waisted' effect on the picture shape. Just a thought. J.