Minerva Corp. of America W-725 Schematic

Minerva Corp. of America W-725

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Product Information:
Model:W-725
Manufacturer:Minerva Corp. of America

Schematic Pages

PNG: Page 1 Rider Manual Volume 19
PNG: Page 2 Rider Manual Volume 19

Schematics Content

Page 1:

Tuning Range -
Standard Broadcast 540 - 1640 KCS.
International Shortwave 5.4 - 19 MCS.

Power Supply: 105-125 volts direct current or 50 - 60 cycle alternating current.

Tube Complement:
1 - 6SK7 RF Amplifier
1 - 6SA7 Converter
1 - 6SK7 IF Amplifier
1 - 6SQ7 2nd Detector, AVC, 1st Audio
1 - 50L6 Power Amplifier
1 - 35Y4 Rectifier

Page 2:

ANTENNA
This receiver contains a built-in loop Antenna of excellent design and will give good results even in localities where broadcast signals are weak. It may be necessary, however, to turn the set toward the direction of the desired signal to provide maximum loop pick-up. For best reception of distant stations an external Antenna should be used. A screw connector is provided on the cabinet back for easy connection to an outdoor Antenna. An external Antenna is required for shortwave reception. Where space prohibits an out door installation, 10 feet of insulated wire stretched out on the floor will usually give adequate results.

INITIAL ADJUSTMENT
Plug line cord connector into 115 volt current supply outlet. Turn Power Switch (see drawing below) clockwise until a click is heard. Wait one minute for tubes to heat and advance control until a response is heard. If the set does not operate or if a loud hum is heard, remove plug, rotate 1/2 turn and replace in socket.

CONTROLS
The position and function of the three controls are shown in diagram below:

No. 1 - Power Switch and Volume Control
No. 2 - Tuning Control
No. 3 - Band Switch, counter clockwise for broadcast-clockwise for Short wave.

ALIGNMENT NOTES
The screws for adjusting the IF and RF Amplifiers, together with the frequencies at which adjustment is to be made, are shown in diagrams below.