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When the TR-7 came to the Amateur Radio market I was in my mid-20s and sold them at Joe Borsch's (W7PNS/SK) Portland Radio Supply Company. Despite my employee discount, they were out of my price range. I settled for a used set of B-Line Twins. Joe, and our Tech Dan Raab owned, and repaired the 7-Line. For many years after selling Portland Radio Joe was the guy to send your TR-7/R-7 to for repairs.
In 1993 I was employed at HP making a great living. I purchased my TR-7, and R-7, which I still own. I just restored both. The VCO Board JFETS had gone out on both - HI OSC on one and LO OSC on the other. The TR-7 is easy to repair and maintain if you take time to read the Service Manual. The TR-7 receives down to 5 kHz if you remember that the LF/VLF Antenna Connection is on one of the Cinch-Jones Connectors. And it's a joy to work DX on the Ham Bands. Mine is a high serial number, Split Back, with NB7A and all Filters.
I've owned a lot of fine transceivers and seperates over the years. The Drake TR-7 and R-7, used as Twins can work DX under very marginal conditions. Only the Ten-Tec Delta II, with it's 8-Pole Filter, comes close to digging a signal out of the mud. Most owners complain about drift. My Drake's drift for the first 30 minutes from a cold start, then remain solid enough to work FT8. The only Mods I've performed were to replace the incandescent Dial Lamps with LEDs. I simply removed the glass envelope from the dial lamps, and installed a small piece of perf board with either one or three Bright White LEDs. These plug in directly to the S-Meter and Dial Lamp Sockets.