Not to derail too far off the milsurp tag line, the Conar 400 was the first 'commercial' TX I owned.  I had a one tube single band TX copied out of the ARRL's License Manual, and I am thinking as many things that were in QST and the Handbook way back when, some fellow copied, in this case NRI,  the circuit and started making them for sale.  My Dad was taking an NRI course on appliance repair, and actually opened a shop and did well.  How well that would do in today's throw away, designed to not be fixed world, is pretty obvious.  The Conar set was in their catalog with their scope, appliance tester, TV and other stuff related to their  correspondence courses.  The Conar had 3 band switched bands, and I had a paper route, so I bought the pair, and the receiver was my first superhet, graduating up from a regen Lafayette Explor-Air.  Like the Ameco AC-1, the Conar twins had a time where they were worth their weight in gold.  I sold that first set for a few bucks around 1976, just like my '68 Dodge Charger with Hurst shifter and Krager mags in 1976 for $400, an identical car in every detail that sold just a few years later for $160,000 at a Barrtett Jackson auction.  A good friend, K4VWD(SK)  gave me a set of Conar twins 10 years ago, but nobody has given me a '68 Charger.  My only OO report, for chirp, came from that 400 on 15 meters.

Charlie, W4MEC in NC