SAFETY SYSTEMS
Step start system when plug-in high tension (It starts power supply slower, protects electrolytics' load and rectifier diodes)
Step start system in the Filaments Transformer (It starts slowly and protects the opening of current filament tension.) A lot of valves have been damaged because of missing this kind of protection.
High Tension Control (amplifier doesn't work until turning on the High tension button)
OPERATE - STBY Control (It cannot be activated before High Tension button)
Inter-Lock Switch