I've sent you high res. scanned images of the 3 Riders pages that detail your RCA120.
As far as tube pins go..............when viewing from the bottom side of the socket, pin #1 starts at the immediate right of the key and proceed in a clock-wise direction.
If you still have these RCA 120 scans available, I would be much obliged if you could send them to me as well. The schematic here is too difficult for me to read, and my example has suffered from past "improvements".
Many thanks,
Basil H.
:Byron,
:
:I've sent you high res. scanned images of the 3 Riders pages that detail your RCA120.
:
:As far as tube pins go..............when viewing from the bottom side of the socket, pin #1 starts at the immediate right of the key and proceed in a clock-wise direction.