I am building a tube amp with a separate power supply in a second enclosure - connected to the amp via an umbilical power cord.
What is the most elegant way to keep the power supply off if someone inadvertently turned on the power supply without the umbilical cord being plugged into the amp?
I have heard of using a relay to do this by running an additional ground wire in the umbilical cord, but haven't seen a schematic or any details of how this would actually be done.
This is a hi-fi amp with a Edcor xpwr054-120 TRANSFORMER, so I will use it for the heater power @24 VDC and the main power @330 VDC (power supply takes the 240 VDC and ramps it to needed 330).
I guess I don't have a way to run an additional low voltage signal via a relay with this setup, is that true? Any suggestions?