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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.
NOTE
1. 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
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