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

bionicmerlin · 11th Feb 2018, 4:06 am

John I did check the brightness of the EHT valve and it's not easy to see but you could be right it's dimmer when I get the problems with the focus . Also I didn't realise that the hight of the picture expands so much again over maybe half hour.
The snaking of the pictures gets very bad up to 15 mins it then gets slightly better as time goes on but never goes away.
Stephan I think all but a couple valves are original but I don't have spare the same type to try but you could be right the could be warn out.
I think I will leave the set on a good amount of time tomorrow maybe a hour on then a hour off bases see if things improve. Thanks Andy

11th Feb 2018, 4:06 am	#22
bionicmerlin Heptode Join Date: May 2010 Location: Warminster, Wiltshire, UK. Posts: 682	Re: GEC BT336 possible tube change John I did check the brightness of the EHT valve and it's not easy to see but you could be right it's dimmer when I get the problems with the focus . Also I didn't realise that the hight of the picture expands so much again over maybe half hour. The snaking of the pictures gets very bad up to 15 mins it then gets slightly better as time goes on but never goes away. Stephan I think all but a couple valves are original but I don't have spare the same type to try but you could be right the could be warn out. I think I will leave the set on a good amount of time tomorrow maybe a hour on then a hour off bases see if things improve. Thanks Andy