The stock ST-70 has a grid and plate wire twisted together between each valve and its output transformer (Blue and Green then Blue/White and Green/White). What is the rationale for this? Don't they carry different voltages and if so wouldn't any cancellation of hum would be unequal? Wouldn't the wire with the higher voltage induce a current into the lower voltage wire?
I am building an amp from scratch with the pentode/triode switches and think it would be better to twist the grid wires (Green and Green/White) together and the same for the plate wires (Blue and Blue/White). After the twisted pairs are routed to a point between the valves they can be separated and connected accordingly. Am I wrong?
I am building an amp from scratch with the pentode/triode switches and think it would be better to twist the grid wires (Green and Green/White) together and the same for the plate wires (Blue and Blue/White). After the twisted pairs are routed to a point between the valves they can be separated and connected accordingly. Am I wrong?