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Further to my personal broad definition of generation 1 vs generation 2 is the front end.
I believe all generation 1 receivers used the KRK2 tuner. This is the one with three 6J6 tubes.
Generation 2 I believe all used KRK5 tuners. These tuners used two 6AG5's and a 6J6 local oscillator.
The so called generation 3 (1950-1952 KCS47 thru KCS67?) used the KRK7 tuner(?). The third tuner had only two tubes: generally a 6CB6 and a 6J6 if I recall correctly.
To me the third generation was the first attempt at cheapening the design. It had a poor (unamplified) AGC and the sync circuits were cheapened.
These guidelines are my own having studied and repaired a number of these RCA sets over the last 40 years. I believe this was a facinating time for RCA consumer televisions leading up to and including early color television. I would be curious to hear from others regarding the earlier RCA black and white sets.
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