R.C.A. Victor Co., Inc. 114 Schematic

R.C.A. Victor Co., Inc. 114

Get a print!

$8.00
Product Information:
Model:114
Manufacturer:R.C.A. Victor Co., Inc.

Schematics Content

Page 1:

RCA. VICTOR CO., INC.

MODDL 114
Voltage, Alignment

Electrical Specifications
Voltage Rating... 100 - 125 A.C. or D.C.
Frequency Rating (A. C.)... 25 - 133 Cycles
Power Consumption
A. C. 60 Cycles, 115 Volts - 60 Watts
D. C. 115 Volts - 40 Watts
Number and Types of Radiotrons... 1 RCA - 78, 1 RCA - 6A7, 1 RCA - 77, 1 RCA - 43, 1 RCA - 2525 - Total, 5
Undistorted Output (A. C.)... 1.5 Watts
Undistorted Output (D. C.)... 0.5 Watt
Frequency Range... 540 - 1710 K.C. and 2400 - 2500 K.C.

This receiver is a five-tube Superheterodyne designed to operate on A.C. or D.C. over a wide voltage and frequency range. Features such as compact construction, dynamic speaker, single Pentode Output tube and the inherent sensitivity, selectivity and tone quality of the Superheterodyne are included in this instrument.

The circuit consists of an R.F. stage using Radiotron RCA - 78, a combined oscillator and first detector using Radio. tron 6A7, an I.F. transformer using two tuned circuits, a second detector using Radiotron RCA - 77 and a power stage using Radiotron RCA - 43. The rectifier is Radiotron RCA 2525, which is used in a voltage doubling circuit. This results in considerable more output when the receiver is used on A.C. than that obtained from D.C. operation.

Line - Up Capacitor Adjustments
The line-up capacitor adjustments for the I.F. stage and the gang capacitors are made in the following manner:
(a) Procure a modulated oscillator such as Stock No. 9050, giving a signal at 175 K.C., 1400 K.C., 1710 K, C. and 2440 K. C. An output meter and non-metallic screwdriver (Stock No. 7065) are also necessary.
(b) The I.F. line-up capacitors should be first adjusted. This is done by placing the oscillator in operation at 175 K, C., coupling its output between the control grid and ground of the first detector, connecting the output meter across the cone coil of the loudspeaker and adjusting the two I.F. line-up capacitors until maximum output is obtained.
(c) After the I.F. circuits are aligned, the broadcast band R.F. is adjusted at 1710 K.C. This is done with the Range Switch at the broadcast position (counter-clockwise). A similar manner is used as that of the I.F. except that the oscillator is set at 1710 K, C., its output is connected from antenna to ground of the receiver, and the dial is set at 8 (minimum dial position). The adjustment is made with the trimming capacitors located on top of the gang capacitor and cach capacitor is adjusted for maximum output.
(d) After making the 1710 K, C. adjustment, set the dial at 18 and the oscillator at 1400. Then adjust the first detector and R.F. line-up capacitors only. This adjustment is made so that the R.F. and lst detector will be aligned over the broadcast bard, but the receiver will still tune to 1710 K.C. due to the oscillator line-up capacitor not being readjusted.
(e) Then set the Range Switch at its clockwise position. The oscillator should now be set at 2440 K.C. and the signal tuned in. Two points on the dial will be noted where the signal is heard, one of which may be louder than the other. Set the dial at either point. Note-the 2440 K.C. signal will still be heard at two points, since the R, F. stage acts as a fixed tuned circuit. Adjust the two high-frequency trimmers, located on the lower side of the gang capacitor, until maximum output is obtained.

RADIOTRON SOCKET VOLTAGES
115 Volts D.C. or 60 Cycles A.C.
Divide all A.C. Values (Except Heater) by 1.3 for 25 Cycles

Page 2:

RCA - VICTOR CO., INC.

MODEL. 114
Schematic
Chassis wiring

Figure A - Schematic Circuit Diagram

Figure B - Wiring Diagram

Page 3:

RCA. VICTOR CO., INC.

MODEL 114 Parts List

REPLACEMENT PARTS
Insist on genuine factory tested parts, which are readily identified and may be purchased from authorized dealers