[wex65]

Starting my first project, a Philco 48-200 Code 121.

I found a schematic and chassis layout for the Code 125 but nothing for the later Code 121.

The tube layout printed on the bottom of the case states that the tubes are 35Z5GT, 14A7, 7A8 and 14B6 and 50A5

whereas the seemingly more common Code 125 uses 35Y4, 7A8, 14A7, 14B6 and 50L6GT

It looks like the 50L6GT was replaced with the 50A5 and the 35Y4 with a 35Z5GT (cabinet says 35Z5GT but maybe the "5" rubbed off? It seems to read 35ZGT)

Checking some of the pins it looks like the wiring itself might be slightly different also.

Unless I am wrong it looks like someone goofed and reversed the 7A8 and the 14B6.

Is there a schematic for the Code 121 and/or are there any wiring differences beyond the change in the two tubes??

Schematic for the 48-200 Code 125
https://a4.pbase.com/o11/56/215056/1/168...titled.png

Chassis layout for the Code 125 (although confusingly it also states it relates to the Code 121?)
https://www.tubesandmore.com/sites/defau...pg18-3.png

Photo of the chassis showing what I think are reversed tubes:
   

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Welcome to the Phorum, wex65! The schematic for your set is in the Philco Radio Library located at the bottom of the page.
https://philcoradio.com/library/index.ph...year-book/
It details differences between 121 and 125 runs. Hope this helps. Take care, - Gary

[GarySP]

I moved your threads into one thread. Any questions about the same radio should be in the original posting. Take care, - Gary