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