Philharmonic Radio Corp. 500C Schematic

Philharmonic Radio Corp. 500C

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Manufacturer:Philharmonic Radio Corp.

Schematics Content

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ANTENNAS. The built-in antennas are satisfactory in most locations, however, external antennas can be used when needed. For amplitude-modulated reception, connect external antenna and ground wire to the terminals provided on the built-in loop.
For frequency-modulated signals, the antenna and lead-in should have an impedance of 300 ohms. Connect the lead-in to the two left-hand terminal screws on the rear of the chassis. Connect a ground wire to the third terminal screw.

POWER SOURCE. Connect the power plug to an alternating-current supply of 115-120 volts, 60 cycles. DO NOT CONNECT TO DIRECT CURRENT.

RADIO OPERATION. Switch on the power by turning the volume control clockwise. Wait 35-40 seconds for the tubes to reach operating temperature. Set the three-position switch on AM or FM as desired. Select the station with the Tuning control. Adjust the volume control and Tone control to suit.

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A - M Alignment

Turn gang condenser to fully meshed position. Set dial pointer on the small dot to the left of the end calibration. Turn volume control to maximum volume. Use a standard A - M signal generator, with the high side coupled to the input point through a .01 uf capacitor. Ground the other side to the chassis. Connect the output meter across the voice coil of output transformer 108. The output of the signal generator should be no higher than necessary to obtain the output reading. Where loop coupling is specified, connect the signal generator output to two or three turns of wire spaced about two feet from the antenna loop.

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Capacitances in uf for electrolytic and paper capacitors, uuf for mica.