W.T. Grant Company 500 Schematic

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Product Information:
Manufacturer:W.T. Grant Company
Description:Series A

Schematics Content:

Page 1:

CORRECTION: - Pin 7 of 12SA7 tube goes to pin 7 of 12SQ7 tube. Pin 2 of 12SA7 tube goes to Pin 2 of 128K7 tube,

POWER SUPPLY... 105 to 125 volts, DC or 50 60 cycle AC, 35 watts.
FREQUENCY RANGE... 545 to 1700 kc.
TUNING... Permeability.
ANTENNA... Built-in plate type. Also provisions for external antenna. No ground required.
SPEAKER... 4 - inch; P.M.; voice coil impedance 3.2 ohms.

POWER OUTPUT.. 800 milliwatts, undistorted. 1.0 watts maximum.
SENSITIVITY. 35 microvolts average for 50 - milliwatt output.
SELECTIVITY... 75 kc. broad at 1000 times signal at 1000 kc.
12SA7, converter
12SK7, I.F. amplifier
12SQ7, 2nd detector, AVC, 1st audio
50L6GT, output amplifier 3
5Z5GT, rectifier

Replace a defective metal 12SK7 tube with another metal tube. Replace a glass 12SK7 tube with a metal tube or with an exact duplicate of the tube now in the set.

Page 2:

(Refer to Chassis View and Voltage Chart for location of trimmers)

Output meter across 3.2 - ohm output load.
Align for maximum output. Reduce input as needed to keep output near 0.4 volts.

Volume control at maximum for all adjustments.
Chassis must be removed from cabinet for proper alignment

The antenna coil assembly is made so that it is movable up or down. When making the adjustment as given in the alignment procedure move the coil assembly very slowly. It can be moved by hand or by pivoting one edge of the blade of a screwdriver in the hole and engaging the blade in the gear teeth of the coil form.

After the antenna coil has been tracked at 1400 Kc. it is necessary to check the antenna trimmer (C2) adjustment again at 1720 Kc. If no appreciable change in trimmer adjustment is made the coil is in track, if the trimmer requires considerable change it will be necessary to again adjust the position of the antenna coil at 1400 Kc. These two adjustments should be tried several times until no change of trimmer adjustment is required at 1720 Kc.

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