20-07-2015, 11:10 AM
(This post was last modified: 20-07-2015, 11:24 AM by Alan Douglas.)
Well if the data sheet says so...but negative with respect to the heater rather than positive would seem to reduce leakage currents. It could no longer act as a thermionic diode.
Easy enough to try: a 250k pot across the HT with the wiper tied to the heater winding; move the pot off ground and see if the hum level changes.
Easy enough to try: a 250k pot across the HT with the wiper tied to the heater winding; move the pot off ground and see if the hum level changes.
