Promenette Radio & Television Corp. 501A Schematic

Promenette Radio & Television Corp. 501A

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Product Information:
Manufacturer:Promenette Radio & Television Corp.

Schematic Pages

PNG: Page 1 Rider Manual Volume 15

Schematics Content

Page 1:

ALIGINENT Set volume control at maximum. Connect -B of chassis to ground post of signal generator through a lomf condenser. Connect output moter across output transformer secondary.

Dummy antenna 250 - mmf condenser

Connect AVC diodes (4 and 5 on 12SQ7 tube base) to chassis ground through a l-megohm resistor. Set signal generator to 456 kc. Feed signal to No.8 pin on 128K7 through the dummy antenna. Adjust trimmers on the output i-transformer to maximum signal. Remove signal from 12SK ? tube base and place on No.5 pin on 12SA7 socket. Adjust trimmers on input i-f transformer for maximum signal. For overall alignment of the i-f transformers, connect the signal generator to the external antenna and retune for maximum output.

For tracking of the oscillator and r-f coils and trimmers on the tuning assembly proper, proceed as follows:

Center pointer on the scale, making sure that it does not over-ride the scale on either end of the band.
Set pointer to 1400 kc on the dial scale. Set signal generator to 1400 kc.
Connect signal generator to external antenna lead. Do not use dummy antenna.
Adjust oscillator trimmer " E until maximum output is obtained.
Adjust antenna trimmer "O" until maximum output is obtained.
Reset dial pointer to 750 kc and reset signal generator to 750 kc.
Adjust antenna coil " A " (by loosening screws and sliding the coil form either up or down) until maximum output is obtained.
Reset dial pointer and signal generator to 550 kc,
Adjust screw plunger " B " in the center oscillator coil " C ". (clockwise to raise frequency and counterclockwise to lower frequency.)