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RADIO BROADCAST
MARCH, 1927
THE LIST OF PARTS
T1.L1.C2 — Thordarson Power Compact, No. 71 . $15.00
Ci — Potter Condenser Block 12.50
Q — Polymet 4-Mfd Condenser 3-50
Cs — Two Polymet l-Mfd. Condensers . . . . 2.00
Three Airgap Sockets 1.80
Lynch Double Mount .50
Two Lynch Single Mounts .70
R; — Lynch Equalizor No. 4 1.00
Ri — Lynch Metalized Filament Resistor, 0.05
Megohms .75
R9 — Tobe Veritas, 20.000 Ohms 1 . 10
Rs — Tobe Veritas, 10,000 Ohms i.to
Ri — Tobe Veritas, 2000 Ohms
L.i — Thordarson Impedance, Type R-106 . T3, Ti — Two Thordarson Type R-200 Transformers
R2, Po — Two Clarostat Variable Resistors Base-Board, Wire, Posts, C Battery ....
ux-201-A Type Tube
ux-171 Type Tube
Raytheon B H Rectifier Tube ....
1 . 10
5.00
16.00 4-50 i .00 1-75 4. 50
Total $79.80
Radio Broadcast Photograph
A TRANSFORMER-COUPLED AMPLIFIER-POWER SUPPLY DEVICE
Designed to supply B voltage for the whole receiver. The filament of the output tube is supplied with a. c, and C voltage is also obtained from the mains for this tube. The circuit diagram gives the connections and constants used in the circuit. Above is a photograph of the complete unit which is unusually compact
Radio Broadcast Photograph
ANOTHER AMPLIFIER-POWER DEVICE
The circuit diagram which applies to the amplifier device illustrated here is substantially the same as that shown in the box above. The 5-ohm resistance strip specified in the list of parts should be connected in series with one of the filament leads of the power transformer to drop the voltage to 5 volts. The potentiometer, R13, is connected across the filament terminals of the power tube socket in order to obtain the equivalent of a center tap. The total capacity in the filter section is 8-mfd. as opposed to the usual 12-mfd.
THE LIST OF PARTS
Ti — General Radio Power Transformer . . . $10.00
Li — General Radio Filter Chokes 10.00
Ci — Four American Electric Filter Condensers,
2 Mfd 7.00
C2 — Two Tobe o. l-Mfd. Buffe Condensers . . 1.40 Cb — Two American Electric Bypass Condensers,
1 Mfd. 2.40
L3 — Thordarson Choke, No. R-196 5.00
Ci — Tobe Fixed Condenser, 4-Mfd 3.50
Ti, T2 — Two Rauland Lyric Transformers. . . 18.00
Three Sockets (General Radio, Benjamin). . 1.75
R;— Rheostat, 10 Ohms .75
Resistance Strip, 5 Ohms (Taken from Old Rheostat)
R2, Rj — Two Electrad Royalty Resistors, No. 2
and No. 3 3.00
Lynch Double Resistor Mounting .50
Ki — Tobe Veritas Resistor, 2000 Ohms . . . 1.10 Ri — Durham Metalized Filament Resistor 0.0;
Megohms .75
Two Electrad Short Jacks . .50
Binding Posts .45
Bakelire 3 . 00
Garfield Brackets 1.25
Ria — Potentiometer, General Radio, Type 214 . i.oo
ux-201-A Type Tube 1.75
ux-171 Type Tube 4.50
Raytheon Bll Rectifier Tube 6.00
Total #85.60
Radio Broadcast Photograph