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

G6ONEDave · 7th Aug 2020, 5:28 pm

I must admit that I thought they would be good for 300vdc, not thought of trying a HT test though. Might have a go at that, as it only needs a tx, rectifier and elec cap, oh and a safety fuse or cut-out to protect the secondary parts against possible shorts. I am not worried about trying the test and it would be useful to know for future projects. Usually I would replace like for like but in the case of certain brands, it's not worth taking the chance imho.

The set that I am working on is the well known Ekco TMB272 and I was originally hoping to replace those pesky Hunts 3nf at 400vdc with these ceramics. As it happens I found some 3n3 630vdc polyesters, so am using those instead.

I would also like to add that I have been looking through the invaluable previous threads on the Ekco TMB272 and now realise just what a poor condition mine is in. However, I am determined not to let it get the better of me.

7th Aug 2020, 5:28 pm	#7
G6ONEDave Octode Join Date: Dec 2019 Location: Owston Ferry, North Lincolnshire, UK. Posts: 1,704	Re: Capacitor voltage rating I must admit that I thought they would be good for 300vdc, not thought of trying a HT test though. Might have a go at that, as it only needs a tx, rectifier and elec cap, oh and a safety fuse or cut-out to protect the secondary parts against possible shorts. I am not worried about trying the test and it would be useful to know for future projects. Usually I would replace like for like but in the case of certain brands, it's not worth taking the chance imho. The set that I am working on is the well known Ekco TMB272 and I was originally hoping to replace those pesky Hunts 3nf at 400vdc with these ceramics. As it happens I found some 3n3 630vdc polyesters, so am using those instead. I would also like to add that I have been looking through the invaluable previous threads on the Ekco TMB272 and now realise just what a poor condition mine is in. However, I am determined not to let it get the better of me.