Radiophone P12F

Humble Manufacturing Co. Ltd.  Model P12-F Radiophone
British Columbia, Canada Forest Service  Radio #  312

This unit has a wooden case with the Transmit / Receive chassis and controls in the top half of the case and the batteries located in the bottom half.  Originally this unit would have had a front door that closed. The microphone, which is missing, would have hung on the inside of the door. The door would have closed and latched when one wanted it to be portable. 

There are two unidentified two pin sockets mounted on the chassis which are not identified. They are not available for users use. 

Dimensions: 
Wooden cabinet:                                  W:  8.25 " X  H: 12.5" X  D: 6.5"
                                                             Weight Without Batteries:   8.25 lbs
Metal Chassis:   Including Knobs         W: 7.625 " X H: 5.25" X D: 5.5" 
                                                             Weight   5.25  lbs

Frequency Range: 2952 to 3445 kc Crystal Controlled

Tubes: 
Transmitter:  3V4 3V4 3V4 3A4
Receiver:      1T4 1R5 1T4 1U4 3A4 3A5
                                           
Power Requirements:
Power for the entire Radiophone is supplied from dry batteries. There are two groups of "A" and "B" Batteries which are described as "Normal Duty Batteries" and "Light weight batteries".  Two cables are provided, one for the normal-duty and one for the light weight batteries. Either set of batteries may be connected to the Radiophone by plugging the cable into the cable socket on the front of the radio. The later model variant’s of this radio have the battery cable(s) directly wired into the chassis.

Batteries:
Normal Use;
Quantity:  Voltage:       Use:            Mfg:            Type: 
   8              3                A                General       #6  Ignition Cells                                          
   4             45               B                General        V-30-B

Lightweight (Portable)
   1              3                   A            General        4H2
   4             45                  B            General        P-96-AA

Credits: 
Geoff Fors
Jerry Proc

In questo link sono elencati 2 modelli, di cui 2 con immagini e 0 con schemi.
Elenco delle radio e altri apparecchi della Humble Manufacturing Co. Ltd.; Vancouver B.C.