27-09-2014, 08:00 AM
(This post was last modified: 03-10-2014, 09:14 AM by Old Sparky.)
(25-09-2014, 03:08 PM)AlanBeckett Wrote: I'd be inclined to put a Resistor across it to avoid it floating, say 1k.I fitted an 820 ohm 0.5w resistor across the 4v winding tags on the mains Tx, which, according to my calculations, means ca 5mA is drawn by this resistor. 3.5vAC is measured across the resistor with my DMM. Is it likely that any (long term) problem will be caused by leaving the AZ31 plugged in (it's heater is o/c), with the rectifier diode & series resistor wired to the valve base so that the valve's anodes & cathode are, in effect, common with those of the 1N4007?
Alan
