Radio Broadcast (May 1929-Apr 1930)

Record Details:

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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 •