Just for the record RADAR was being built and tested in 1939 in the UK and the Germans had RADAR with parabolic dishes. They had developed a range of 2.4 GHz triode transmitting tubes for such use. Copies of these tubes have been made and used by the Russians since 1945 and about 10 years ago found their way onto the amateur market for 144 - 1296 EME PA’s. Still a damn fine way to get lots of rf but a pity about the weight of power supply, blower fans etc.
In the 1930’s operation on 112 MHz and higher was achieved by removing the bases of some tubes to minimise lead inductance for VHF operation. Alternators and vibrator supplies were used for the field and summit operations. New tubes like the 6L6 (1936) gave 25 w + on 60 MHz, 6V6 (1937) 5 - 10 W on 60 MHz and the slightly later 807 gave 40+ watts respectively.
Super hets as well as super regen rx were used.