Some of these old TRF sets were excellent performers, many military versions were used throughout WW2, the American and the German ones in particular were a masterpiece of TRF engineering, check out the Torn Eb etc. Lo radiation was a concern with some superhets as they could be DF'd by the enemy, with the TRF the regen in oscllation for CW work was well down the signal processing chain, I think the Germans got their regen osc radiation at the antenna teminals down to around 10 uv on some sets.
Lawrence. Edit: Also check out the Lo6K39a receiver, 6 tuned circuits...
Lawrence. Edit: Also check out the Lo6K39a receiver, 6 tuned circuits...
