Hallicrafters S19R receiver.

[dieseljeep]

Originally Posted by jeffs01879

Mine has the 6SK7 and 6SQ7 also. It seems that some were equipped with the grid cap versions 6K7 and 6Q7. I've found documentation showing both configurations.

Jeff

I think that was the last of the run.
The schematic is incomplete regarding the BFO circuit. It shows no injection from the detector stage. The receiver has it, a gimmick wrapped around the 2nd IF transformer lead.