[TenTec] OT: Hammarlund SP-600, modified by Northern Radio

[Ken Brown]

Ignore and delete immediately if off topic posts offend you.

I am looking for a schematic of a Hammarlund SP-600 modified by Northern 
Radio. I have "stock" SP-600 schematics, but this modification has 
changed a couple of tubes and the wiring. The changes seem to mostly be 
around the local oscillator (HFO), 3.5 MHz oscillator and BFO. Not 
having an accurate schematic is making troubleshooting more difficult.

Thanks, DE N6KB