The Maguire Model 6L is a superheterodyne radio receiver having 5 tubes plus a rectifier tube, with provision for phonograph input, for operation on 105-125 volt AC or DC power supply. The tubes used are a 12SK7 as an R.F. amplifier; a 12SA7 as an oscillator-converter, a 128K7 as an I.F. amplifier, a 12SQ7 as an AVC, detector, and 1st audio amplifier, a 35L6 as an output, and a 3575 as a power rectifier.
The broadcast band covers a frequency range from 535 to 1620 kilocycles. The dial is calibrated in kilocycles (KC) (less the final zero).

CONTROLS TONE CONTROL: (Center knob).
Turn knob counter-clockwise for maximum bass and clockwise for maximum treble response. VOLUME CONTROL: (Left-hand knob).
Turning knob clockwise turns the receiver on and turning further increases the volume. TUNING CONTROL: (Right-hand knob).
This knob is used to select stations, Tune station until it is at maximum clearness. Never attempt to reduce the volume by detuning the station- always use the volume control,
OPERATION Turn the " On - Off switch and volume control clockwise about half its range. This supplies power to the receiver. After allowing the tubes to warm up, tune in the desired station by rotating the tuning control. For best results, tune the desired station with the volume turned low. This enables you to get the exact point where the station comes in best. Then adjust the volume control.
To operate the receiver as a phonograph amplifier, connect phonograph lead to phonograph terminals at rear of loop, according to instructions printed at phonograph terminals. Turn " On - Off " switch and volume control clockwise about half its range and adjust tone control to desired position. Turn tuning control clockwise to the extreme right hand end of its range to silence radio.

When using D.C. power supply, and after allowing sufficient time for tubes to warm 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 is in the best position. Try both positions, leaving the plug in the position that produces the least hum.
For 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 antenna terminal at the rear of the loop. Do not use a ground with this receiver.
If the receiver fails to operate, see that all tubes are pushed down in their respective sockets as illustrated in the tube layout diagram below. Always disconnect line cord plug before making any adjustments inside cabinet. It is necessary to remove the receiver from the cabinet to replace tubes.
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.
Phonograph terminals are provided at the rear of the cabinet. Shielded cable should be used to connect a crystal type phonograph pickup to the radio. When the tuning control is turned clockwise to the end of its range the radio section of the receiver is silenced, permitting use of the receiver amplifier with phonograph input.