CL in NC mjcal77 at yahoo.com
Thu Sep 10 15:56:04 EDT 2009

Yes, it does go to the 6AQ5 audio output, but it is using voltage developed across this resistor to develop a  bias for the RF and IF gain control circuit, changing the potential across the bottom of both the RF and IF gain pots.  When in RX, both gain pots are at ground  on one end. That is why you can put a pot across the mute connection on the accessory socket,  and adjust this pot to allow the RX1 to receive just a bit and  set a sidetone level in the RX while transmitting  CW, and extra contacts on the external TR relay will short this pot out in RX to allow normal operation.  If you do this, the STBY/RX receive switch is left in the STBY position.

Charlie, W4MEC in NC


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