[RodB]

Hi Nick,

Usually the dashed lines connected to components means the part is a substitute in the circuit for specific models. You have to be careful when interpreting this because some dashed lines mean something else, as in showing the power switch physical connection to the volume control. They're both controlled by the same shaft.

Yes, cleaning volume controls can be tricky sometimes. There's usually some tiny gap where the terminals enter the case where you can put a spray straw.

When measuring resistors you can leave them in circuit if one end is connected to a tube element other than the filament. Otherwise, you have a good chance of a false reading. The resistor values in the schematic are the values you should measure when out of the circuit. Some schematics will show a voltage chart or tube socket diagram and resistance measurements may also show you the resistance to ground or B-. Resistance readings on a candohm usually show the resistance between lugs, then you have to show your intelligence by adding up the values to find the total of the entire length. Sometimes the parts list will give you the information..