> Wasn't the RBA a TRF? I thought the one I used > in 1954 was. > > 73 Clete Yes. I have two. Bigger than an RAL/RAK. Two RF amp stages, the second of which runs at very low plate voltage to act as a limiter. Regen detector with separate oscillator, which is kinda weird, but not unheard of. This method is also used in the Mackay receivers of the period.