Ameritron AL-811H Amplifier inside

Grid over current board GOP-100 from AMERITRON.
Amplifier is switched to stby mode if the grid current is above  190 mA.
Toggle the STBY switch and the amplifier is ready again.

► Installation Instruction for the GOP-100

► Push-button for resetting, to avaoid the annoying toggle of the STBY switch
► To have everything under control:  ON / OFF switch for the protection board



 

811A tube,
original tube of AMERITRON AL-811H amplifier,
metal sheet as anode,  plate dissipation 60 W







Now used 572B tube,
Chinese brand, exchange for original tube 811A,
solid graphite anode,   plate dissipation 160 W

AL 811H  inside