[RCFlyer]

Hello to all! 
 I have a Philco Battery Farm Radio Model 38 (Code 123). Can someone lead me in the right direction to finding or altering a power supply that will work with this Radio.  The schematics
call for 5 inputs.  A+ at +2 volts , B+ 135 volts another B+ 67.5 and two C-.  -3 and -7.  I was looking at a kit from AES https://www.tubesandmore.com/products/kit-power-supply 
My problem is the kit only has one c- output.  
Can someone help me alter the design to make two C- outputs or suggest a better option.
Thanks

[morzh]

Since they have a common GND, you could possibly use a second potentiometer in parallel to the first to create the second C- voltage.