When using D.C. power supply, and after allowing sufficient time for tubes to warn up, if the receiver does not operate, remove the line cord plug from the socket and reverse. Replace the plug in the reverse position and allow tubes to warm up, at which time the receiver will operate
When using A.C. power supply, it will be found that there will be less hum when the line cord plug is in the best position. Try both positions, leaving the plug in the position that produces the least hum.
For the reception of local stations no antenna is necessary, the built-in loop providing sufficient volume. If it is desired to listen to more distant stations, an antenna 50 to 100 feet long should be connected to the flexible lead protruding from rear of the cabinet. Do not use a ground with this receiver.
If the receiver fails to operate, remove the back plate to see that all tubes are pushed down in their respective sockets as is illustrated in the tube layout diagram below. Always disconnect line cord plug before making any adjustments inside of cabinet.
Sometimes, when operating this receiver in buildings having steel in their construction, it will be necessary to use an external antenna to provide sufficient volume for satisfactory operation.

TUBE LAYOUT