I need the schematic for the 7 pin adapter to hook the SSB Adapter to my HQ-110C. The manual that came with it only shows the 9 in adapter. Why don't hams keep the 7 and 9 pin adapters that originally came with the unity? Sure would make it easier on later users.
Dave,
Looking at the manual for the HQ-110 (from BAMA), I see the last IF stage being the pentode section of a 6AZ8 - which is a 9 pin tube.
According to the manual for the HC-10 (from BAMA), the schematic of the adapter is very simple - but has to be customized for the receiver the HC-10 is used with.
From the instructions, the HQ-110 converter for the 6AZ8 looks like this:
Pin 1 (Pentode Plate) - straight-through connection from plug to socket
Pin 2 (Pentode Screen) - straight-through connection from plug to socket
Pin 3 (Pentode Cathode) - 140 to 240 uH RF choke connected between plug and socket. Center conductor of coax cable to HC-10 connected to Pin 3 of socket (not plug).
Pin 4 (Heater, ungrounded side) - straight-through connection from plug to socket
Pin 5 (Pentode Suppressor and Heater, grounded) - straight-through connection from plug to socket and outer conductor (shield) of coax cable to HC-10
Pin 6 (Pentode Grid) - straight-through connection from plug to socket
Pin 7 (Triode Cathode) - straight-through connection from plug to socket
Pin 8 (Triode Plate) - straight-through connection from plug to socket
Pin 9 (Triode Grid) - straight-through connection from plug to socket
If you want to connect the HC-10 to the 6BA6 IF tube, the 7 pin adapter looks like this:
Pin 1 (Grid)- straight-through connection from plug to socket
Pin 2 (Suppressor) - straight-through connection from plug to socket and outer conductor (shield) of coax cable to HC-10
Pin 3 (Heater) - straight-through connection from plug to socket
Pin 4 (Heater) - straight-through connection from plug to socket
Pin 5 (Plate) - straight-through connection from plug to socket
Pin 6 (Screen) - straight-through connection from plug to socket
Pin 7 (Cathode) - 140 to 240 uH RF choke connected between plug and socket. Center conductor of coax cable to HC-10 connected to Pin 7 of socket (not plug).
73 de Jim, N2EY