Paul, thank you so much for the help. I checked the resistances around terminal 11 and the 22 uf cap and all checked out. I resoldered the ground connection from terminal 10 on the power transformer to the terminal strip 3. However, I do not know what the different resistances within the power transformer should be so I couldn't check that yet. Can you clarify that second paragraph for me? And can you clarify what an acceptable level of hum is for the SeX without C4S? Thanks again.
THIS POST HAS BEEN MODIFIED TO CORRECT AN ERROR IN NOTE 4)!!
Normal noise for a SEX amp is 0.3mV at the speaker terminals.
Second paragraph:
1) My best guess at this point is that the 6.3v winding, which is common to both channels, is not properly grounded. You can check the DC resistance from power transformer terminal 10 (the 6v winding centertap) to the chassis. It's in the middle of page 22 in the manual.
--- Properly grounded means zero resistance between terminal 10 of the power transformer and the chassis plate.
See note number three below. No transformer resistance is involved. Note that you will not be able to measure with precision fractions of an ohm.
2) I'd check the resistance from the G terminal of the IEC inlet to the chassis as well, since it's right there.
--- Sorry, on the current IEC the terminal is labelled E (for Earth) rather than G (for Ground). My bad, I didn't look it up. There are three terminals on the IEC socket, labelled E, L, and N (for Earth, Line, and Neutral). There is a wire from terminal E to the chassis ground lug, as described on page 20 of the manual. check the resistance between the terminal E and the chassis; it should be zero.
See note number three below. No transformer resistance is involved. Note that you will not be able to measure with precision fractions of an ohm.
3) In both cases, check the transformer or socket terminal to the actual chassis, which tests all the mechanical and soldered connections.--- Do not re-solder. Do not connect the meter to the solder. Do not connect the meter to the wire. Connect one meter probe to the actual terminal itself. Connect the other meter probe to the chassis plate.
4) Check the resistance from power transformer terminal 10 to power transformer terminals
1 and 2 4 and 5, to be certain that terminal 10 is connected internally in the correct way - I'm trying to cover all the bases here!
--- The actual transformer resistance of this winding is too small to measure. Meters that can distinguish such small resistances from zero cost $2000 and up. So just look for as close to zero ohms as you can measure! Note that you will not be able to measure with precision fractions of an ohm.
Clear now?