[MrFixr55]

Hi Andy, an interesting problem.  R33 and R34 form a voltage divider to provide the cathode bias for the 75 1st Audio, but more importantly, for the 41 Audio Output tube.   All of the DC current for the radio passes through those 2 resistors.

If there is a B+ short to chassis ground, then both of those resistors should fry pretty quickly.  Try the following:
Pull the 41 from its socket and fire up (sorry for the pun) radio.  R33 and R34 should not get hot.  If they still do, then there is a short between B+ after the Field Coil and ground.  Check C27 (Audio Output bypass cap) and the 4uF section of C30 (Between output of field coil and ground).  Also check for solder splashes.

B+ Voltages should be rather high die to no current being drawn by the 41.  Measure between ground and the common Negative of C31.  It should be a rather low voltage.  If this is the case, reinstall the 41 and check the voltage between chassis ground and the common negative of C31.  It should not be above about 18-20V.  If it shoots up, then there is excessive current being drawn through the 41.  An internal short in the 41 can do this.  One cause of the internal short could be an open Output transformer.  This will cause the screen grid of the 41to absorb all of the tube current, glow white hot, burn out and possibly short to the suppressor, internally connected to the cathode and therefore to chassis ground, and creating the dead short againes the output of the filter and putting about 250V across R33 and R34.

Hope this helps.

Best Regards, 

John, MrFixr55