[Boatanchors] Refurb S-38C Gone Crazy

[Bob Jackson]

This radio won't go silent, not even close! When turned on and warmed up, a low but fully "listenable" level of clean audio is present. With only slight advance of the volume control, audio level skyrockets. The set is fully re-capped; all caps and resistors test OK. Volume pot is good. 

Circuit has been traced multiple times for voltage values. All are within bounds of schematic values. Swapping out the 12SG7 for a 12SK7 is of little help. 12SQ7 has been swapped as well - no effect. Has anyone else had this problem? Any suggestions would be very welcome.

73 to all,

Bob  AG5X