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Pretty much ~90% of all AM and AM/SW table radios from the mid-1930's till the end of tubes used the same circuit...There were around 4 different generations of tube styles used (and some variations within those generations), plenty of subtle circuit variations that usually were more flash than substance, heck there were deluxe AA6 and AA7 sets that added an RF amp and or push-pull audio (p-p audio is mostly found in radio/phono combos) for better performance as well as AA4 sets which deleted an IF amp and were only good if you were close to the transmitters or had a long wire antenna and were VERY cheap/poor.
Some AA5s had great audio and reception (RCA and other major brands), but most were average or poor. Three or more knobs (or a built-in phono or input for one) usually means a better set...The 2 knob radio only jobs were usually the cheapest radio the brand sold (unless they had an AA4 on the market). Many of the cheapies had really cool looking plastic cabinets to lure in customers.
Anyone with a decent collection of table sets bought on the basis of looks has several AA5s.
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