WEBSTER CHICAGO 79 - Page 26

WEBSTER
1
CHICAGO
BULLETIN 79P038
MODEL 80
VOLTAGE AND RESISTANCE MEASUREMENTS
All voltages measured with line voltage of 117 instrument the sensitivity of which is at least 1000
volts at 60 cycles with volume control in full
counterclockwise and tone control in full clock-
wise positions.
All voltages shown are measured to ground.
(chassis).
Voltages should be as shown plus or minus 10
A.C. voltages are measured with a rectifier type percent.
ohms per volt.
D.C. voltages are measured with a D.C. type
Vacuum Tube Voltmeter.
READINGS TAKEN: RECORD- LISTEN SWITCH IN RECORD POSITION
OUTPUT SWITCH IN No. 1 POSITION RECORDER VOICE COIL CONNECTED
VOLTAGE
TUBE TYPE PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8
(1) 6W OV. 3V. AC OV. DC —. 1V. DC* OV. DC 23.5V. DC 3V. AC 45V. DC
(2) 6J5 OV. 3V. AC 127V. DC ' I' OV. ' f' 3V. AC 4.6V. DC
(3) 6V6GT OV. 3V. AC 300V. DC 305V. DC — 45V. DC f 3V. AC 9.5V. DC
(4) 6X5GT OV. 3V. AC 350V. AC OV. 350V. AC OV. 3V. AC 350V. DC
*Cannot be measured with a 1000 ohm per volt meter.
'I'Not a tube element.
RESISTANCE
Measured to ground with a DC VTVM type ohm meter
TUBE TYPE PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8
(1) 6S17 0 Ohms . 1 Ohms 0 Ohms 4.7 Meg. 0 Ohms 47K Ohms . 1 Ohm 487K Ohms
(2) 615 0 Ohms . 1 Ohms 288K Ohms 270K Ohms 1 Meg. 249K Ohms . 1 Ohm 1K Ohms
(3) 6V6GT 0 Ohms . 1 Ohms 225K Ohms 225K Ohms 35 K Ohms 35K Ohms . 1 Ohm 270 Ohms
(4) 6X5GT 0 Ohms . 1 Ohms 180 Ohms INF 190 Ohms INF . 1 Ohm 225K Ohms
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