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

sobell1980 · 17th Feb 2021, 11:11 am

I have a full set of valves on their way hopefully arriving for the weekend. I have lots of valves but none for FM sets. So it will be good to have the ones I don't use this time as spares. I will try the EZ80 first as its the quickest and easiest thing to eliminate. The service data quotes 250v at the Ez80 cathode. If this is correct I'm a way off at 208v. Also it takes a few minutes to get to the 208v climbing very slowly from approx 160v and seems to peak at 208v. I could understand it being a resistor if only one valve HT was low. As I say, if the data quotes 250v and im running at 208v with new reservoir/smoothing caps surely it has to be the rectifier? I will do the gram socket test also. Could I do this with my sig gen?

Dave

17th Feb 2021, 11:11 am	#6
sobell1980 Octode Join Date: May 2011 Location: Bromyard, Herefordshire, UK. Posts: 1,241	Re: Bush VHF61 repair. I have a full set of valves on their way hopefully arriving for the weekend. I have lots of valves but none for FM sets. So it will be good to have the ones I don't use this time as spares. I will try the EZ80 first as its the quickest and easiest thing to eliminate. The service data quotes 250v at the Ez80 cathode. If this is correct I'm a way off at 208v. Also it takes a few minutes to get to the 208v climbing very slowly from approx 160v and seems to peak at 208v. I could understand it being a resistor if only one valve HT was low. As I say, if the data quotes 250v and im running at 208v with new reservoir/smoothing caps surely it has to be the rectifier? I will do the gram socket test also. Could I do this with my sig gen? Dave