06-21-2018, 05:08 PM
Hi Tom
Well the rectification happen between the plate and filament of the 80 tube. The filament of the 80 is HV+ and the center tap of the HV winding (terminal 6) of the power transformer is HV-. The caps a long w/the spkr field coil just filter the 60cy hum out.
I few points.
If you are seeing AC voltage from the 80 filament to term 6 your 80 maybe shorted.
Be sure that the caps are connected w/the + side going to the field coil. The - side connect to the center tap. In some circuits (not this one) the - are connected to the chassis.
Be sure the spkr is plugged in and that the field coil is good not open.
Check the resistance of both sections of #43
Well the rectification happen between the plate and filament of the 80 tube. The filament of the 80 is HV+ and the center tap of the HV winding (terminal 6) of the power transformer is HV-. The caps a long w/the spkr field coil just filter the 60cy hum out.
I few points.
If you are seeing AC voltage from the 80 filament to term 6 your 80 maybe shorted.
Be sure that the caps are connected w/the + side going to the field coil. The - side connect to the center tap. In some circuits (not this one) the - are connected to the chassis.
Be sure the spkr is plugged in and that the field coil is good not open.
Check the resistance of both sections of #43
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
