06-13-2016, 03:50 PM
What I "think" is odd is how the switch is "grounded"/jumpered/wired to pin 8 of the 12SQ7 tube. If that is supposed to be the ground wire for that switch shouldn't be attached to pin 1? That obviously looks like the ground since that wire running off of it is attached directly to the chassis.
http://www.nostalgiaair.org/pagesbymodel...007583.pdf
Pin 8 of the 12SQ7 is one of the two pins connected to the heater it goes to the off/ on sw and is also B-. B- is floating in this set (not connected to the chassis as it would present a shock hazard). Chassis ground is connected to B- though C20 and R11 they provide a rf ground for the tubes shield on pin 1 of the metal tubes.
Check ur PM box.
Terry
http://www.nostalgiaair.org/pagesbymodel...007583.pdf
Pin 8 of the 12SQ7 is one of the two pins connected to the heater it goes to the off/ on sw and is also B-. B- is floating in this set (not connected to the chassis as it would present a shock hazard). Chassis ground is connected to B- though C20 and R11 they provide a rf ground for the tubes shield on pin 1 of the metal tubes.
Check ur PM box.
Terry
