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RADIO BROADCAST.
No 26
Radio Broadcast's Set Data Sheets
June, 1929
ALL AMERICAN-MOHAWK RECEIVER, MODELS 60-61-62-65-66
This all-electric receiver uses six tubes with a 17lA-type tube in the output circuit. The volume control is a 75,000-ohm variable resistor connected across the tuned circuit feeding the detector tube. The circuit consists essentially of three stages of r.f., one
stage of which is untuned, a detector, and two stages of a.f. amplification. It should be noted that the power transformer is equipped with an extra socket for a dynamic loud speaker and that the primary is tapped for high and low line voltages.
5286-S. :
20 ohms 5277-S 2400 ohms 5274S 170 V. 180 V -Red Wire
APPROXIMATE CURRENT AND VOLTAGE READINGS' USING THE JEWELL No.199
-TUBE IN SOCKET"
TYPE TUBE
POSITION OF TUBE
A
VOLTS
B
V0LIS
A
VOLTS
B
VOLTS
C
VOLTS
NORMAL
mA.
GRID TEST
CATHODES
PLATE CHANGE
226
1 R.F.
1.4
120
1.25
112
8
'3.2
6.6
3.4
226
2 R.F.
1.4
120
1.25
112
8
3.2
6.6
3.4 •
226
3 R.F.
1.4
120
1.25
112
8
32
6.6
3.4
227
Detector
2.4
110
2.20
40
0
2.2
2.2
0
0.0
227
1 A.F.
2.4
120
2.20
112
8
3.0
6.4
6
3.4
171-A
ZA.F.
4.7
180
4 50
155
40
15.0
16.5
1.5
280
Red
4.70
19.0
Filter Condenser Unit 124-A
Line Voltage -110 95-115 Volt Tap Vol.Con.at Max.
110
VAC
Note: Above indicated part numbers are the electrical
part and assembly numbers of items used in ; circuit. When ordering parts of assemblies specify this number as well as name of item
FRESHMAN MODEL QD-16-S
1 This receiver consists of a stage of screen-grid amplification using a 222-type tube, a grid leak and condenser type detector, and a two-stage transformer-coupled audio amplifier, the output of which feeds into a dynamic loud speaker. Some regeneration is introduced into the circuit by the small variable condenser Ci. Two tuned
Regulating Screw
circuits are used between the output of the screen-grid tube and the input to the detector circuit. The set. therefore, contains three main variable condensers, and a 40-mmfd. midget condenser is connected across the first tuned circuit to permit accurate tuning for the reception of distant stations, j
1 mfd. 1 mfd.
UMMJ
Umm.
LftMAflJ
10,000 ohms 12,500 ohms
Yellow I
110V 120 Fuse " _
V. 1Amp. Switch
100-125 V. 60Supply
100 •
• JUNE • 1929 •