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RADIO AGE for January, 1927
The Magazine of the Hour
23
Rear view of the completed receiver showing all parts in place and wired
perites, should be placed in before the other wiring is done.
In mounting the double rotor coupler attention should be paid to the fact that upper control is the regenerative one. This winding is larger, in turns, than the primary of the RF circuit, and the coupler should be mounted with the regenerative rotor at the top of the panel and the RF primary at the bottom. All connections of the two couplers are brought out to soldering lugs which makes assembly quite easy. A strip for the binding posts at the rear of the baseboard may be made from a piece of bakelite 7 inches long and about an inch wide. Another smaller
LIST OF PARTS
1 Samson antenna coupler
1 Samson double rotor coupler
2 Samson .0005 mfd. variable condensers
1 Samson 2-1 audio transformer
2 Samson dual impedances 2 Samson 85 mh chokes
1 Samson neutralizing condenser
2 Samson vernier dials
5 Eby UX cushion sockets 10 Eby engraved binding posts
3 Radiall *4 Amperite's
1 Radiall 4-A Amperite 1 Sangamo .001 mfd. condenser 1 Sangamo .0001 mfd. condenser 1 Sangamo .0005 mfd. condenser 1 Durham 2 megohm grid leak 1 Carter "Imp" battery switch 1 Centralab 0-500,000 ohm variable resistor 1 7x26x3-16 panel 1 8}&x25x}& baseboard
strip 2 inches by 1 inch can support the two binding posts for the loud speaker, while another strip of the same size can be used for holding the two binding posts for the antenna and ground.
As shown in the photograph the grid condenser may be mounted directly upon the grid terminal of the socket. This will conserve space. The 0-500,000 ohm variable resistance which is used as a volume control is mounted on the panel at the extreme right, and is connected in the circuit across the grid and bias connections of the first audio transformer. It is not shown in the schematic drawing, but is in the pictorial. Another means of cutting the volume of the receiver lies in the manipulation of the RF plate rotor so that its winding is at right angles to that of the secondary. Which of the two is preferable remains for the individual set user to determine.
Neutralization of the first tube is not difficult, the knob permitting any value of capacity within the range of the neutralizer to be used.
This receiver has been used with A and B batteries and with A and B elimination, performing satisfactorily in either case. For congested areas like Chicago and other metropolitan centers, it should appeal to fans who have had difficulty in tuning out interfering stations.
TJ7ANTENNA
DET.ROTOR
65t1.H. CHOKE
LfiQtt
GROUND
E/L.SW. S -A
DUAL IMPEDANCE TRANSFORMERS
+A
-B
45
67
O 90
O735
Schematic circuit of the Dual TC receiver from which the set may also be wired