[dconant]

Hello, I have begun the restoration of my Philco 91. I have been looking over the parts and the very first one I checked is way off. It is a 160K resistor connected to pin 4 of the 44 (RF) tube. It looks factory. That resistor does not exist on any of the schematics I have for that radio. The schematic shows connection from pin 4 of the RF tube to pin 4 of the IF tube with nothing in between. The other end of the resistor connects to block 9. Also the connection between pin 4 of the RF and IF is through a switch. This switch is on the same post as the on/off switch. It will be the bottom switch in the picture.

Schematic here https://philcoradio.com/library/index.ph...chematics/ in the 1932 section. My chassis is code 121 based on the label attached to the metal tube shield. 

I found a schematic on Nostalgia Air showing the switch as being a frequency switch. There is only one band on the radio. The NA schematic is for code 126-226. The schematic is here http://www.nostalgiaair.org/pagesbymodel...013884.pdf. Off to a crazy start already.

Thank you,
Dan