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Radio Service Bulletin-No. 2,9
Model 30 Receiver
The Model 30 Receiver is designed for use with the latest 2-volt filament
type tubes only.
Table 1-Tube Socket Readings Taken with Average Set Checker
Filament Plate Grid Plate Screen
Tube Circuit Volts Volts Volts Current Grid
Milliamperes Volts
32 1st R. F. 2.0 150 .. .0015 60
32 2d R. F. 2.0 150 .. .0015 58
32 3d R. F. 2.0 150 .. .0015 58
30 Detector Rectifier 2.0 ... . . .... ..
30 Detector Amplifier 2.0 15 . . .. . . ..
30 1st Audio 2.0 90 Note I .002 ..
31 {2d Audio} 2.0* 150 24 .008 ..
31 Push-Pull 2.0* 150 24 .008 ..
*These readings reversed with respect to other Filament Voltage readings.
NOTE1. With volume control in "Off" position, approximately 4 volts; with volume control
full on, less than I volt.
Always use high-resistance voltmeter, preferably 1000 ohms per volt, when checking voltages
in the Receiver. For reading plate and screen voltages, use a 250- or 300-volt scale. Voltage readings
taken with meters having less than 250,000 ohms resistance will be lower than voltages given in the table.
When testing a Model 30 Receiver, all tubes must be in their proper sockets. The speaker must
be connected and the tube shield must be fastened in place. The readings in Table I were taken using
"A," "B" and "C" batteries.
Table 2-Resistor Data Table 3-Condenser Data
No.on Color Resistance No.on Capacity- MFD.
Figs. I and 2 Ohms Figs. I and 2
0 Golden Yellow 5,000 ® .00005
@) Auto Buff 25,000 @ @ .000250
® Jade Green 70,000 @ .01
@ ® Silver Gray 100,000 ® ® @) .05
@ White 250,000 @ @ @) ® .05 with 250-ohm resistor
@) @ @ Battleship Gray 500,000 winding
@ Tubular {250 @) .25 single section
(two section) 800 @ .25 two sections