[GCARC] Ameritron 811-H 10 meter mod

[MARK]

Good Afternoon All, 

I have an Ameritron 811H amplifier and I would like to do the 10/12 meter mod, on the amp, so that I can tune for this bands. I know it involves activating the AUX switch. Would anyone know how this is done? 

Thanks 

Mark 
WA2DIY