This Radio Receiver is of the Tuned Radio Frequency type, employing the following tubes:
No 58 as radio frequency amplifier: #324-A as detector; #347 as power audio and #380 as rectifier
The dual wave operation allows signal reception covering 4000 kilocycles to 1500 kilocycles when the "wave changing switch" is in the short wave position and from 1700 K.C. to 550 K.C. when the wave changing switch is in the Long Wave position.
The controls of the set are as follows:
The knob at the left controls the volume - increasing in a clockwise rotation. this knob also controls the line power switch. The center knob controls the station selector dial. the knob at the right operates the "two tap" tone control switch. In the center and below the station selector knob is the wave changing switch, the two positions of which are designated by "s" for short wave and "L" for the longer (standard broadcast) wave.

Installation:
This set is designed to operate from a standard power supply of 110 to 125 volts, 50 or 60 cycles, alternating current.
Best results will be obtained when operated from a fifty foot antenna and a good ground - connected respectively to the red and black wires at the back of the chassis.

Service Data:
Due to the fact that the wave changing switch connects the short wave and broadcast secondaries in parallel when operating on the short wave band it is necessary always to adjust for resonance on the broadcast band first.
The parallel balancing trimmers will be found on the side of the two gang condenser.
The R.F. plate to grid coupling condenser is the black insulated disc fastened to the side of the detector coil secondary. Obviously any change in the adjustment of this coupling condenser will necessitate re-adjustment of the parallel balancing trimmers. To re-align the short wave circuits adjust to resonance the two parallel circuit trimmers mounted upon the front side of the R.F. transformer and the short wave coil bracket. All alignment operations should be made with a modulated oscillator attenuated to a very weak signal.
The Radio Frequency broadcast transformers are of the "resonated primary" type. The primaries being broadly peaked at 500 kilocycles. The secondary or grid coils are tuned simultaneously by the Two Gang Variable Condenser.
The sensitivity response is increased at the high frequency end of the broadcast band by the introduction of a small coupling capacity from the R.F. plate to the detector grid. The plate of the detector is "capacity coupled" to the grid of the #347 power tube and the plate of the power tube transformer coupled to the electro-dynamic speaker.
The grid bias for the power tube is obtained by a voltage divider system across the choke (dynamic speaker field) on the negative side of the high voltage circuit.
Voltage readings for servicing purposes follow: