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RADIO BROADCAST
No. 23 Radio Broadcasts Set Data Sheets May, 1929
THE BALKITE RADIO RECEIVERS, MODELS A-3, A-5, AND A-7
This completely light-socket-operated receiver uses five 227-type tubes and two 112A-type tubes in push-pull in the output. The use of 227-type tubes in all the sockets preceding the power stage somewhat simplifies
the wiring since only one filament winding is required to supply all of them. Also the use of 227-type tubes results in less hum output. The volume control varies the plate voltage applied to the r.f. tubes.
Phonograph Pick up
STANDARD READINGS USING JEWELL TESTER N0.199 Voltage Swiich in "Hi" Position Line Volts 105-125
TYPE OF TUBE
POSITION
READINGS PLUG IN SOCKET OF SET
Tube out ol Tester
Tube in Tester
A
VOLTS
B
VOLTS
A
VOLTS
B
VOLTS
C
VOLTS
NORMAL PLATE
m.A.
PLATE
m.A. GRID TEST
227
1st R.F.
1 75 2 60
88 104
1 68 2 50
74 94
3 560
2 ) J 8
1.2 1.7
227
2nd R.F.
1 75 2 60
88 104
1.68 2 50
74 94
3 5 60
2.338
1.2 1.7
227
3rd R.F.
1.75 2 60
881C4 .
1 68 2 50
74 94
3.56.0
2.3 3 8
1.2-1.7
227
Del.
1 75 2 60
4052
1 68 2 50
2634
1.52.8
0.1 0.3
227
1st Aud.
1 75 2 60
88 104
1 68 2 50
74 94
3 560
2.3 3.8
1 2 1.7
1 12 A
1st PP.
4 2 50
124 158
4.14 9
114-148
8.0-11.0
7.4 104
4 7 50
U2A
2nd P.P.
4 2 50
124 158
■1 I 4 9
114148
8.0-11 0
7.4 10.4
4.7-5 0
280
Reel
404 8
2637
115VAC.Line
THE STEINITE MODEL 261 ELECTRIC RECEIVER
The circuit diagram published here indicates three taps on the antenna coil. This is correct for all receivers distributed previously to September 20th, 1928. Since that date the number of taps has been increased to
seven, controlled by a seven-point switch located near the volume control. This circuit is incorporated in all Steinite receivers, models 261 to 266 inclusive.
500 800 226 -H35V. ohms 226 +135 V. ohms 226 ^-+135 V.|
226 +120V.
1.25 V.
0.2 mfd.
>Gnd.
C bias on
r.f tubes -11 volts 1st a. f. tube -10 volts 2nd a. f. tube -33 volts
-135 V.
= ==
•^yYiRnr — wwv
lmfd.Jlmfd. ""]
10,000 ohms
1 mfd. 1 mfd.
0.2 mfd. 2.051/
O O i
Phono
graph
0.2 mfd.
1100 ohms
6 C
Loud Speaker
The data which was given in the description of the receiver in previous "Srt Data Sheets" lias been lettered on the above diagram.
• may, 1929 . . . page 41 •