Newbie questions Ekco U245 - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

paulsherwin · 15th Jun 2018, 4:28 pm

If you have replaced the smoothing electrolytics, then the hum is likely to be a heater/cathode leak in the UL41 or perhaps the UBC41.

AndyP-UK · 15th Jun 2018, 9:43 pm

Oh dear, that would be disappointing. I googled that Paul and found something you wrote 15 years ago on the every subject.

I think I will film it working now, I don't mind the hum too much but I suppose whichever valve it is will get worse and give up some time or other, so restricted usage for now until some surplus valves come along to try.

ms660 · 15th Jun 2018, 9:57 pm

Try shorting the grid of the UBC41 to chassis and see what effect that has on the hum level.

Lawrence.

paulsherwin · 15th Jun 2018, 10:02 pm

If you don't mind the hum it may soldier on for years like that.

15th Jun 2018, 4:28 pm	#21
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,947	Re: Newbie questions Ekco U245 If you have replaced the smoothing electrolytics, then the hum is likely to be a heater/cathode leak in the UL41 or perhaps the UBC41.

15th Jun 2018, 9:43 pm	#22
AndyP-UK Triode Join Date: May 2018 Location: Haywards Heath, West Sussex, UK. Posts: 19	Re: Newbie questions Ekco U245 Oh dear, that would be disappointing. I googled that Paul and found something you wrote 15 years ago on the every subject. I think I will film it working now, I don't mind the hum too much but I suppose whichever valve it is will get worse and give up some time or other, so restricted usage for now until some surplus valves come along to try.

15th Jun 2018, 9:57 pm	#23
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Newbie questions Ekco U245 Try shorting the grid of the UBC41 to chassis and see what effect that has on the hum level. Lawrence.

15th Jun 2018, 10:02 pm	#24
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,947	Re: Newbie questions Ekco U245 If you don't mind the hum it may soldier on for years like that.