[Chuck Schwark]

Looking at the service bulletin, it sounds like you are not developing enough AVC voltage due to a possible short or open on the AVC bus, or you have an open (very common) second IF can secondary winding that's only passing a weak signal due to capacitive coupling between the IF transformer windings, but provides no DC path for the detector. Approx. -5 volts is usually an avarage AVC voltage with a good local station. Your -0.3 volts indicates AVC buss problem or a DC current path problem as above. Also check the first IF transformer's tertiary coil which passes the AVC voltage to the 1A7G converter tube through the loop antenna coil. Check the loop also for a possible open there. If you have replaced cap #8 and #16 and resistors #10, #15, #14 and #13 check ok for values, and you know the converter, IF and DET tubes are ok, then the suggestions above are all that's left that can effect the AVC bus.