Approved Electronic Instr. Corp. A-600 Schematic

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Product Information:
Model:A-600
Manufacturer:Approved Electronic Instr. Corp.

Schematics Content:

Page 1:

OPERATING INSTRUCTIONS

Miniature Superheterodyne Broadcast Tuner

Model A - 600

Introduction:

The circuit of this tuner is a standard superheterodyne of high efficiency, using miniature tubes throughout. A.C. - D.C. circuitry is used and therefore CARE SHOULD BE EXERCISED WHEN THIS TUNER IS CONNECTED TO OTHER EXISTING EQUIPMENT. Inasmuch as the audio output cable is connected to the power line (for low hum consideration) it would be unreasonable to float the chassis. While it is possible to do so and insert a fairly large paper capacitor in return with the output cable shield, the existing above ground voltage between the cable shield and power line ground would result in unbearable hum conditions. In order to avoid fuse blowouts or shock, it is ABSOLUTELY NECESSARY THAT THE POLARITY OF THE TUNER POWER LINE CORD IS SUCH THAT THE TUNER CHASSIS AND ASSOCIATED EQUIPMENT ASSUMES THE SAME POLARITY IN RESPECT TO THE POWER LINE GROUND. This can be easily checked with an A.C. voltmeter. The output cable is attached within the tuner to the low output tap. If higher output is desired connect the out put cable to the medium or, high output as shown in the diagram below.

Specifications: With a strong signal tuned in

A. V, C.: 3-7 volts.
Oscillator Grid - 8-11
IF Frequency 455 kc.
Selectivity 10 / down 7Kc.
Gain Ant. 5
Gain Converter 30
Gain IF 60
Output impedance High

Audio output 10 - 5 1 volt
Adjustable in 3 steps.
Power consumption 25 Watts
D.C. Voltage 110-120 volts
Total current 25 mils.
Tubes;
1 - 35W4 Rectifier
1 - 12AT6 Diode Audio
1 - 12BA6 IF Amplifier
1 - 12BE6 Converter

Page 2:

OPERATING INSTRUCTIONS

Miniature Superheterodyne Broadcast Tuner

Model A - 600 AC

Introduction:

The circuit of this tuner is a standard superheterodyne of high efficiency, using miniature tubes. The power supply is a standard 117V. 60 cycle, full wave rectifier. A power transformer isolates the line from the chassis. No shock hazards. Ideally suited for installations where space is at a premium, The output cable is attached within the tuner to the low output tap. if higher output is desired connect the out put cable to the medium or high output as shown in the diagram below.

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