[PhilcoPhan1936]

Next step is to inject a 470kc signal thru a blocking cap connected to pin 3 of the 6k7.
If nothing heard inject an audio signal to pin 5 of the  6J5 with the tube removed. If
nothing heard you got something miss wired between the 6J5 and the vol cntrl.

Went over the radio and schematic with a fine tooth comb. Couldn't find and mis-wirings. Still no signal or audio on your recommended tests. I connected my iPad using a .1uF cap in line with the tip connector, and the ground hooked to the chassis. This radio is deaf as a post.
Would a bad 6K5G prevent any audio from getting through? It does check out, but it is a bit low, though not excessively.
Would part 29, the audio muting switch be a possible problem? I'm assuming having the switch closed would conduct the audio. If there was a problem with it, is there a way to remove it by rewiring or just disconnecting it?