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

sobell1980 · 5th Dec 2017, 6:15 am

I don't think it can be the sockets. If I leave the valve plugged into it's socket and supply the socket solder tags underneath with a supply straight from the transformer winding it works immediately. If I measure the voltage at the solder tags on the base with these supply wires in place i get 4 volts. Take the supply wires away and measure again i get zero. Remove the valve from socket and measure again, I get approx 4 volts. Install the valve without my own wires it disappears again.

5th Dec 2017, 6:15 am	#45
sobell1980 Octode Join Date: May 2011 Location: Bromyard, Herefordshire, UK. Posts: 1,241	Re: Murphy A188C repair. I don't think it can be the sockets. If I leave the valve plugged into it's socket and supply the socket solder tags underneath with a supply straight from the transformer winding it works immediately. If I measure the voltage at the solder tags on the base with these supply wires in place i get 4 volts. Take the supply wires away and measure again i get zero. Remove the valve from socket and measure again, I get approx 4 volts. Install the valve without my own wires it disappears again.