Hello all... I posted on that above subject here a few years ago regarding a very unusual National receiver I saw at a Nearfest NH hammer which looked like a Scott SLRM that had been converted to miniature tubes and had different power supply components. I recently came across what I believe I saw at Nearfest on Nick England, K4NYW’s Navy Radio web site. It was a National R-302/URR-22. Nick has info that National was awarded a contract to build modified REE receivers in 1949. REE was the Navy model number for the Scott SLRM Marine Receiver. From review of the URR-22 manual on Nick’s Navy Radio web site, the major modifications included replacement of the SLRMs AC/DC mains power supply with an AC only transformer type supply, replacement of octal tubes with miniature 6.3 volt filament tubes, the addition of a buffer amplifier stage to then BFO oscillator output, and incorporation of an AGC amplifier tube. The sets appeared to have used the original SLRM chassis, but was repackaged with a new higher front panel and larger cabinet. A dial lamp dimmer control and line level output controls were added to the front panel, and appear to be the main reason for the new higher front panel.
What Nick did not have info on was whether of not National modified existing complete Scott manufactured SLRM sets or built new ones from scratch using existing components either purchased from Scott or supplied from the Navy, or new parts purchased from the original suppliers. The set I saw would indicate that existing complete SLRMs were reworked, because there is evidence that the chassis have filler plates added over or under the chassis holes for the original octal tube sockets for mounting of the miniature tube sockets.
Does anyone have any more information on the SLRM/ National R-302/URR-22 connection?
Chris AJ1G Stonington CT
Scott SLRM S/N 1841