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

Vintage45 · 27th May 2018, 6:51 pm

Thank you all for your observations, I did not replace any mica caps, only the paper ones (0.1mf ones). I think I have located the problem. The Screen grid voltage on the EF39 (pin 4) was only 5V and not the 60v it should be according to the circuit data sheet. On measuring the 68K resistor I had a very high reading. Have not replaced this yet as I have had to order a suitable wattage resistor. I have been careful not to disturb the RF alignment so all should be well when the resistor is replaced. Once again thank you for your help, I will keep you posted.

27th May 2018, 6:51 pm	#6
Vintage45 Retired Dormant Member Join Date: May 2016 Location: Bath, Somerset, UK. Posts: 16	Re: Radio Rentals Model 58 Thank you all for your observations, I did not replace any mica caps, only the paper ones (0.1mf ones). I think I have located the problem. The Screen grid voltage on the EF39 (pin 4) was only 5V and not the 60v it should be according to the circuit data sheet. On measuring the 68K resistor I had a very high reading. Have not replaced this yet as I have had to order a suitable wattage resistor. I have been careful not to disturb the RF alignment so all should be well when the resistor is replaced. Once again thank you for your help, I will keep you posted.