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The GE 200 is similar to most of these six tube sets, though it uses a 115V pilot light - most use the #47 connected to the 35Z5 heater as shown above. I have a GE radio service manual, and found ZERO sets with the 12B7. But 12SG7 is the octal equivalent, if I remember correctly. They cheaped out on the front end and used a broadband RF amp instead of a third tuning gang. The model 220 I have uses the RF stage on on BCB - not on shortwave. I can email a bigger schematic if you need it.
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