[Ron Ramirez]

Terry,

I've seen this thread plus the one you posted over at the other place.

I can tell you that the 201X chassis in a 200X cabinet which "azenithnut" owns was formerly owned by me; and before that, by John (rocklandman). I had owned the set for years and had never done anything with it, so it was time for it to move on to someone who might do something with it.

Since you also own one of these hybrids, this (to me anyway) is proof that Philco put together more than one of these hybrid mutts and sent them out to be sold. It also makes sense that yours is a later version chassis. I would assume that Philco did this near the end of the 1935 model year, to get rid of excess 200X cabinets and 201 chassis.

I think you are more knowledgeable on this subject than me, but actually having a 10 kc filter in a high fidelity set makes sense. Let's say you lived in an area where 77 WABC (770 kc) is coming in strong at night. You want to hear Cousin Brucie on Saturday night so you crank up not only the volume, but also the selectivity control for maximum fidelity (NRSC standard notwithstanding). But where you live, WJR in Detroit (760 kc) also comes in strong at night. Let's pretend there is no NRSC standard. So you hear WJR bleeding over into Cousin Brucie's show (adjacent channel interference). The 10 kc filter is there to help keep WJR out of the WABC signal.

With the NRSC standard (Google it), AM stations are limited to a 5 kHz audio bandwidth (they were previously limited to 10, which made the 10 kc filters useful). They may not be useful anymore since NRSC, and could probably be eliminated from your high-fidelity radio.