08-10-2016, 08:44 PM
Did notice that your filter caps are a bit odd. On the bottom normally they would have a solder lug in the center not a wire. Would bet that they have been restuffed with different caps than what is printed on the label. And yes the - side of the caps are not at chassis ground they are at B-. If you where to connect them to the chassis it would short out the negative voltage that the power supply develops from the power transformer hv winding center tap to the bias resistor.
The 77 and 78 share the same pinout but the characteristics are different. Will work but will better with the 78.
The 77 and 78 share the same pinout but the characteristics are different. Will work but will better with the 78.
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
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
