UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - My first foray into Old model TV repairs. Ferguson 991T.

Heatercathodeshort · 24th Sep 2020, 8:13 pm

Don't worry too much about LOPT resistance readings. The manufacturers changed the spec of their transformers during production. It's not uncommon to discover transformers that read around 10k on the overwind but state maybe 500 ohms in the manual.
Eureka resistance wire was often used to reduce capacity and 'ringing'.
It's not so easy to get a connection on the EY51 anode. It sits in it's own Bakelite coffin complete with lid and the LOPT has to be removed to get to it! J.

24th Sep 2020, 8:13 pm	#27
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: My first foray into Old model TV repairs. Don't worry too much about LOPT resistance readings. The manufacturers changed the spec of their transformers during production. It's not uncommon to discover transformers that read around 10k on the overwind but state maybe 500 ohms in the manual. Eureka resistance wire was often used to reduce capacity and 'ringing'. It's not so easy to get a connection on the EY51 anode. It sits in it's own Bakelite coffin complete with lid and the LOPT has to be removed to get to it! J.