Moreplay Upgrade Polarity Issue During Low Voltage Circuit Test: I have 6.3 VDC on each of the tube sockets, but polarity is positive on both sockets. DMM is always connected red to red and black to black. The black and red wires reverse position at each of the two sockets. Red wire goes to plus at the pcb; black wire goes to negative for both pairs. Where's my negative supply?
John
John
