David Bogen Co., Inc. R502 Schematic

David Bogen Co., Inc. R502

Get a print!

$8.00
Product Information:
Model:R502
Manufacturer:David Bogen Co., Inc.

Schematic Pages

PNG: Page 1 Rider Manual Volume 18
PNG: Page 2 Rider Manual Volume 18

Schematics Content

Page 1:

NOTES: - ALL CAPACITANCE VALUES IN MFD.
ALL VOLTAGE READINGS TAKEN WITH A 20.000 OHMS PER VOLT VOLTMETER UNDER NO - SIGNAL CONDITIONS

IF FREQUENCY 455 KG BROADCAST RANGE 1630 - 540 KC SHORT WAVE RANGE: 18 - 5.3 MC

Page 2:

Input Voltage: 117 volts
Power Frequency: 60 cycles
Range: 540 KC to 1630 KC and 5.3 MC to 18 MC.
Intermediate Frequency: 455 KC
Tubes: Total, 5: 1-58G7, 1-6SA7, 1-6SK7, 1-6H6, 1-605, 1-5X5
Output: The output matches a high impedance phonograph line,
Installation: Connect an antenna and ground to the terminal 3 marked ANT and " GND ". From the audio output jack, connect with a single conductor shielded wire (to reduce the possibility of hum pickup) to the amplifiers.

Aligning Instructions: Allow tuner to warm up for 10 minutes before aligning.
I.F. Alignment:
1 - Connect the test oscillator output to R.F. section of variable condenser.
2 - With " Band Selector Switch " in " Broadcast " position turn station selector to 540 KC.
3 - Tune test oscillator to 455KC and adjust its output so that the tuning indicator tube starts to close.
4 - Adjust the I.F, trimmers for the narrowest shadow in the tuning eye, readjusting the oscillator output as necessary.

Short Wave Band Alignment:
1 - Connect the test oscillator output to the " ANT " and * GND " terminals of the tuner.
2 - Set both the test oscillator and tuner dials to 18 MC.
3 - Make certain that the tuner's variable condenser plates are fully open when the dial pointer is at 18 MC.
4 - Adjust trimmer on the oscillator section of the variable condenser for minimum shadow in tuning indicator.
5 - Set both test oscillator and tuner dials to 16 MC.
6 - Adjust trimmers on the Antenna and R.F. sections of the Variable condenser for minimum shadow in tuning indicator.

Broadcast Band Alignment:
1 - Put "Band Selector Switch" in the "Broadcast" position
2 - Set both the test oscillator and tuner dials to 540 KC.
3 - Adjust padder condenser for minimum shadow in indicator tube.
4 - Set both the test oscillator and tuner dials to 1630 KC.
5 - Make certain that the tuner's variable condenser plates are fully open when the dial pointer is at 1630 KC.
6 - Adjust " broadcast " trimmer of oscillator for minimum shadow in tuning indicator.
7 - Set both test oscillator and tune: dials to 1400 KC.
8 - Adjust " Broadcast " triminers of antenna and R.F. circuit for minimum shadow in indicator tube.
9 - Set both the test oscillator and tuner dials to 600 KC.
10 - Readjust padder condenser for minimum shadow in indicator tube
11 - Set both the test oscillator and tuner dials to 1400 KC.
12 - Read just " broadcast " trimmers of antenna and R.F. circuit for minimum shadow in indicator tube.