starfish
Well-known member
Hi, I'm building a power supply for a Royer SD tube mic using one transformer for B+ and a separate regulated DC ps for the tube heater. Does the heater supply need to be referenced to ground or should it float? Also, I was wondering what the difference in plate current is when using the 5840 as a triode as opposed to a pentode. I have the data sheet for pentode operation but haven't seen any info on triode use.
Thanks
Thanks