03-06-2015, 02:09 PM
Common can negative means that the 3 filter condensers have - side connected together. Now on sets without a power transformer AC/DC sets. Sets with a voltage doubler (will only work properly with AC input to the power supply) and sets with a phono motor are not truly AC/DC sets.
One side of the AC line is connected the plate of the rectifier tube like a 35Z5, 35Y5, and 35W4. The other side the AC line is B- or where the - side of the filters would connect.
Now there is a problem if you connect B- to the chassis then you create a shock hazard. One side of the AC connected to the chassis could put 110vac between the radio chassis or the radio's metal cabinet and any thing that is grounded. So what they did is they took all of the parts that needed to be at B- and connected them together but NOT to the chassis. This creates a - buss. This is why your filter condensers - don't connect to the chassis.
Clear as mud right????
Terry
One side of the AC line is connected the plate of the rectifier tube like a 35Z5, 35Y5, and 35W4. The other side the AC line is B- or where the - side of the filters would connect.
Now there is a problem if you connect B- to the chassis then you create a shock hazard. One side of the AC connected to the chassis could put 110vac between the radio chassis or the radio's metal cabinet and any thing that is grounded. So what they did is they took all of the parts that needed to be at B- and connected them together but NOT to the chassis. This creates a - buss. This is why your filter condensers - don't connect to the chassis.
Clear as mud right????
Terry
