01-02-2025, 02:20 PM
Quite often the plunger for the switch is held in the AC position by routing the power cord through a slot in the cabinet. Those switches are always a problem.
Additionally, I usually replace the 117Z3 with a 1N4007 diode, add resistor in series with r100 and a 9 volt zener diode for protecting the filaments. This results in just about zero heat dissipation and instant-on (no warmup).
Additionally, I usually replace the 117Z3 with a 1N4007 diode, add resistor in series with r100 and a 9 volt zener diode for protecting the filaments. This results in just about zero heat dissipation and instant-on (no warmup).