[DaleHCook]

According to the service info it says voltages are measured with a Philco 026 circuit tester. I’m not familiar with that tester so not sure if it’s a VTVM or a VOM.

The manual for the 026 is in the Philco Radio Test Equipment Manual (1944) which I posted here a few years ago.

https://philcoradio.com/library/index.ph...nual-1944/

The 026 is a 666 ohms per DC volt VOM. As Ron noted the input impedance varies with range. To determine it multiply 666 by the maximum voltage of the DC range you are using. Because of that readings with be higher when measured with a VTVM, an AMM, or a DMM.