26-01-2020, 01:23 PM
Having a short while ago 'revisited' the 274A, removed the o/p valve and checked that it's heater is OK (it is) as is the heater circuit connection at the valve socket. I again powered up the radio, still to be greeted with silence. A few quick readings taken with my DMM suggests that HT, etc., voltages are within spec., so I'm still scratching my head. I've temporarily mislaid my circuit diagram and notes about the 274A, so I'm probably missing something simple. Best to go back to it when I find the data concerned, I guess!
