Ho Jay !
Yes, B+ is tabbed B4... until this is easy to fix but first the internal chassis is varnished, hard to see the cable colours... and second i have on my hand some different shematic.. Third someone have cut and paste some wire...
Mine have the E13 whit ten pin... ther is a white and gray cable on the areo of the suppy that was cutted.. this one run on main wiring cable until to be near V18 where is cut again just outside the main wiring cable..
One cable from the third section of C160 (the B+ cap) go to to pin 1 on E13 where is the C163 and this cable is obviusly out of place..
No leads added to mute terminals. seem to be unbodified..
So.. 3 cable out of place.. if not more can find later hi hi !!!
73s Mario
Mario,
You really have to turn off B+ to the RF stages to get proper muting. Shorting the antenna won't do it. You will still get too much signal and will hear your transmitter without turning gain down. You mentioned the switch measures 300 ohms across it. Also you said voltage was high. Maybe someone tapped HV before the second choke in the power supply. You are measuring the resistance of the second choke. The original wiring may be ok, just something added which needs to be removed. Look for an added connection between L51 and L52. Also make sure nothing is connected to external mute terminals/plug. Are there any leads added to mute terminals inside the chassis?
Jay-
