Hi to all you.I am restoring a nice Stewart Warner 1262A that you know is a nice deco piece for every vintage radios collector.The chassis is all right,IF coils have their own continuity,AC tranformer is ok,also the antenna and oscillators coil for each band seems ok.This equipment line up 3 IF tranformers,or if you prefer 2 IF stages.I thinked to myself why put 2 IF stages instead one as usual.What does improve? Reception? Cleaner signal? Best quality separation of stations? What else? And.....if it's so better way why other leader radio brands rarely used a 2 IF stages? Did was so higly cost make this? These obviously are myself loud thoughts, by if someone wants to explain more about it please let me know.

Hi, Humphrey: I think an extra IF stage would improve both sensitivity and selectivity.

Better sensitivity is easy to understand - you can get more amplification with two IF stages than one.

A tuned IF stage is like a narrow pass-band filter - with a peak at the IF freq. So I think two stages would provide a little sharper tuning, i.e., better selectivity.

Dear Doug.Thanks for reply back.It's as I supposed to be.Anyway I wonder why just a few radio brands had these 2 IF stages.Certantly because it was costly.I noticed that also a few radio brands had the variable selectivity control,that is useful for sharp and /or narrow reception using one IF stage for making this operation.Anyway thanks for have explained in detail to me.