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492
RADIO BROADCAST
MARCH, 1927
THE LIST OF PARTS
Ti — Amertran Transformer, Type
PF-52 ....... $18.00
Ri — Amertran No. 400 Resistor .
Li, L2, L3 — Three Amerchokes, Type No. 854
T2, T3 — Two Amertran Deluxe Transformers
R2, R.i, R4— Three Clarostats . .
Ri — Elkay No. 4 Equalizor and Mounting
L4, Ls — Two Samson Audio Chokes, No. 3
Re — Lynch Fixed Resistor, o. 1 Megohms
Ci, C2, C3 — Three Tobe i-Mfd. Bypass Condensers, No. 301
7.50 12.00
20. 00 6.75
•75 6 00
• 75 3-75
Radio Broadcast Photograph
POWER TRANSFORMER
Loud Speaker C7 O O
SECOND STAGE TRANSFORMER
T3
Ci, C5, Cg, G — Four Tobe 4-Mfd Power Pack Condensers, No 604 ....
Cs — Tobe 2-Mfd. Power Pack Condenser, No. 602
Carter Short Jack .
Eveready C Battery, No. 771
Six Binding Posts, with Strip
Three Airgap Sockets .
Base-Board
ux-210 Tube .
ux-201-A Tube
ux-216-B Rectifier Tube
Lynch Single Resistor Mounting
Total . . . .
FIRST STAGE TRANSFORMER
28.00
4.00
• 25 .60 1 .00 2.25 ■75 9.00
> -75 7.50 ■35
Si 30.95
(Ground Transformer and Condenser Cases)
B + Detector
A HIGH-VOLTAGE A.C. OPERATED POWER AMPLIFIER
Which employs the 216-B as a rectifier and a 210 power tube in the last stage. Filament current is supplied from the a. c. mains for the last tube, as is also the grid voltage. The circuit gives the connection and values of the different apparatus. A preferred arrangement of this amplifier, using an ux-171 output tube, was shown in the upper box on page 385 of the February Radio Broadcast
THE LIST OF PARTS
Ti — General Radio Power Transformer Unit. Type 391 Ci — General Radio Condenser Block, Type 392 Li — General Radio Choke Block, Type 366 Ri — General Radio Voltage Tap Resistance, Type 393A T2 — General Radio Input Audio Transformer, Type 285 T3 — General Radio Output Transformer, Type 367 2 Sockets
Sw— 1 D. P. D. T. Snap Switch 7 Binding Posts, with Terminal Strip 1 Base-board
1 Attachment Plug and Cord 1 ux-171 Tube I ux-213 Tube
These parts may be obtained in kit form, price S47.50 without tubes
Connect to all cases
Output
Input
110-V A C
A ONE-STAGE AMPLIFIER-POWER SUPPLY DEVICE
Kmploying an ux-213 tube as a rectifier and an ux-171 as an amplifier tube. Plate current is supplied for the tubes in the main part of the receiver. The various elements enclosed in dotted lines in the circuit diagram indicate that such may be obtained in one unit. The photograph shows the general layout of the amplifier unit. This amplifier is particularly adaptable to the "Universal" Receiver