Vintage Sets - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Radio Tech · 25th Dec 2017, 5:31 pm

I took Graham's advice and duly changed the 4.7k resistor on the cathode of the o/p valve, I now have audio at a decent level. The resistor that was in there originally had a yellow body but no band and only a weak purple tip, it did read extremely high and that was the reason I assumed it could have been a 4.7k resistor, but there, I was indeed wrong, never mind. Been patching the loudspeaker cone up, had a tear in it and used toilet paper and pva glue. just got to make the frame of it look better. Next will be the cabinet. And thanks Mike T for that info on the loose coupling, rather odd I must say.

Best wishes

Ken

ms660 · 25th Dec 2017, 5:47 pm

Here's a picture of one from another thread:

https://www.vintage-radio.net/forum/...0&d=1261351040

Lawrence.

Station X · 25th Dec 2017, 6:10 pm

Well done.

As soon as I looked at your circuit 4.7k stuck out like a sore thumb. I'm used to seeing resistors of 200 to 300R in this position. So I looked at the data sheet and did the calculation.

Quote:

Originally Posted by Radio Tech

I took Graham's advice and duly changed the 4.7k resistor on the cathode of the o/p valve, I now have audio at a decent level. The resistor that was in there originally had a yellow body but no band and only a weak purple tip, it did read extremely high and that was the reason I assumed it could have been a 4.7k resistor, but there, I was indeed wrong, never mind.
Best wishes

Ken

Radio Tech · 27th Dec 2017, 2:40 pm

Hi Folks

Tweaked the I.F. cans and worked back to the front end, I now have BBC Essex coming through ok, the audio seems a bit distorted though, not sure if this is the loud speaker or something a little more sinister but we will see, I am going to work through and check all the voltages again and make notes of what they are.

Best wishes

Ken

25th Dec 2017, 5:31 pm	#21
Radio Tech Nonode Join Date: Dec 2012 Location: Bocking, near Braintree, Essex, UK. Posts: 2,071	Re: Vintage Sets I took Graham's advice and duly changed the 4.7k resistor on the cathode of the o/p valve, I now have audio at a decent level. The resistor that was in there originally had a yellow body but no band and only a weak purple tip, it did read extremely high and that was the reason I assumed it could have been a 4.7k resistor, but there, I was indeed wrong, never mind. Been patching the loudspeaker cone up, had a tear in it and used toilet paper and pva glue. just got to make the frame of it look better. Next will be the cabinet. And thanks Mike T for that info on the loose coupling, rather odd I must say. Best wishes Ken

25th Dec 2017, 5:47 pm	#22
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Vintage Sets Here's a picture of one from another thread: https://www.vintage-radio.net/forum/...0&d=1261351040 Lawrence.

27th Dec 2017, 2:40 pm	#24
Radio Tech Nonode Join Date: Dec 2012 Location: Bocking, near Braintree, Essex, UK. Posts: 2,071	Re: Vintage Sets Hi Folks Tweaked the I.F. cans and worked back to the front end, I now have BBC Essex coming through ok, the audio seems a bit distorted though, not sure if this is the loud speaker or something a little more sinister but we will see, I am going to work through and check all the voltages again and make notes of what they are. Best wishes Ken