Power Cord of AC/DC Receivers
Line-cords of AC/DC sets often have the resistor necessary for tube heating included.
Sometimes, also the pilot lamp is connected to this resistance wire.
This should be kept in mind if the line-cord of an AC/DC set has to be replaced. Additionally, also the asbestos in the covering today is regarded as a problem.
Lit.: Ghirardy, A.A.: Receiver Troubleshooting and Repair, Rinehart, 1955