Raytheon Mfg. Co. PR-51A Schematic

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Product Information:
Manufacturer:Raytheon Mfg. Co.

Schematics Content:

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This model is a 3 - way portable radio with 4 tubes plus a selenium rectifier and uses a built-in antenna. The receiver will operate on 115 volts, 50 to 60 cycles AC, or 115 volts DC, or on the self-contained batteries. When using the radio on AC, reversing the plug may reduce hum. If the radio does not operate in one minute on direct current (DC), reverse the plug. When battery operation is desired, the line cord plug is inserted into a socket switch on the chassis (see bottom cabinet view), the insertion automatically moves the switch contacts for battery operation. When the line cord plug is out of the chassis switch, the batteries are automatically disconnected.


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Since the receiver is small and compact, not every A or B Battery will fit in the space provided. Listed to the left are the five most common manufactured types to be used for replacements.

When battery operation is desired, the excess line cord length must be rolled and up placed in the position shown in the bottom chassis view above.


The Alignment Procedure below includes the sensitivities at the input of various stage. All measurements are based on an output of 50 milliwatts. This may be measured by disconnecting the speaker voice coil and substituting a
3.2 ohm, 5 watt resistor across the secondary winding of the output transformer. A reading of. 4 volts AC across this resistor will be equivalent to a 50 milliwatt output with speaker connected. The volume control must be set to maximum.. The signal source must be an accurately calibrated signal generator capable of supplying the frequencies designated, modulated 30 % with a 400 - cycle audio signal. A 400 - cycle audio signal is required for the audio measurement. Variations in sensitivities of plus or minus 25 % are usually permissible.

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When ordering parts, specify part number and complete model number

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