|
Sensitivity would be in the front end/tuner. And that could have been part of it too, they didnt have the good rf amp tubes that early. (Did they have the nuvistor that early?)
More IF stages would add to the noise as well as decrease reliability.
Maybe its due to advances in coil winding?
Some of the later sets you could tell they were just cheaping out, like the ones with 1 IF tube. 3 is a good number, 5 is to many to align and troubleshoot.
I have a cheep0 AA5 radio that really a AA4, no IF tube, one IF can. It has really poor reception over the radios with the IF tube. It seems like the higher end transistor radios have more IF stages.
Some random thoughts.
|