RCA-Victor-Co-Inc-RC-457-D 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN PAGE 484-C Models 45X5 and 45X6 (Chassis No. RC -457-D) Five -Tube, Single -Band, AC -DC Superheterodyne Receiver Model 45.X:5 Walnut Finish Plastic Cabinet Model 45X6 Irons Finish Plastic Cabinet Electrical and Mechanical Specifications FREQUENCY RANGE 540-1,680 kc POWER SUP

2、PLY RATINGS Intermediate Frequency 455 kc A -C Rating 105.125 volts, 50-60 cycles, 30 watts TUBE COMPLEMENT (1) RCA-12SA7 1st -Detector -Oscillator (2) RCA-12SK7 I -F Amplifier (3) RCA-12SQ7 2nd -Detector, 1st A -F, and A.V.C. (4) RCA-50L6GT Power Output (5) RCA-35Z5GT Half -Wave Rectifier D -C Rati

3、ng 105-125 volts, direct current, 30 watts POWER OUTPUT (125 volt, 60 cycle supply) Undistorted 1.0 watts Maximum 1.25 watts LOUDSPEAKER Type 4 -inch Electrodynamic Cabinet Dimensions (inches). Height 5.1/16, Width 81, Depth 41 Dial Lamp (1) Mazda 51, 7.5 volts. 0.2 amp. Weight (net) 4 pounds CI 05

4、MED R9 33,002 ff CHASSIS SRS L ANT. COILS 5n 4 INDICATES COMMON WIRING INSULATED FROM CHASSIS Cu It - 22,R000 ODC. COILS In CIA Od MFD. 125A7 1T PETL OSC 8 125K7 BOTTor,r v1Ev I.F AMPL. OF TULLE 50CHET5 1 IFKRAHS r 93 _ GREEN C16 n/n 87 Cld Rtl %220,Oo0A 50 6L 6T DUMM FTY E-rRN,IF TESA, i - 1 1,2,2_

5、9a7 L.SS, ELSA ell C14 Ben 1K IF TRAM. 455 SC. 0 a) CIA CIA TUBE C,7 47,Dod T /1j1) BRDWH R4 2.5 M EG. C9 0.1 MED. VOL. CONTROL s0, 000 CS .01 MFD. RS 10 MEG. 50L6GT OUTPUT Ri 210,000. DUMMY TERM IT TOM TERM. VOLTAGES SHOULD HOLD WITHIN * 20% wIro 117 v. AC SUPPLY. STARRED Ill VOLTAGES ARE OPERATING

6、 VOLTAGES IN CIRCUITS WITH HIGH SERIES RESISTANCE-, THE ACTUAL MEASURED VOLTAGES WILL BE LOWER DEPENDING ON THE VOLTMETER LOADING. 35Z5GT RECT- T . OS MFD. I 55EiT IAT Its G1 FIELD Il 400 a RED 119 Y20 MFD BLUE =1C2b ,2 MF D. BLACK -4. i 0.2IM2 C TRx Line Bypass Capacitor: In some production, the .0

7、05 mid. line bypass is connected from plate to cathode on the rectifier tube, instead of from plate to chassis. 4505 (RC 451 D) T -95185-I B.C. .RCA VICTR DIVISION :OF RADIO CORPORATION OF AMERICA, CAMDEN N. J., U. S. A. 收音机爱 好者资料库 RadioFans.CN PAGE 465-C 145X5, -6 Alignment Procedure Output Meter A

8、lignment.-Connect the meter across the voice coil, and tum the receiver volume control to maximum. Teat-Oscillator.-For I -F alignment, connect the low side of the test -oscillator to the receiver chassis through a .01 mid. capacitor, and keep t:.z output as low as possible. Pre -Setting Dial,-With

9、gang condenser in full mesh, the pointer should be adjusted so that it is vertical. Antenna.-The set is equipped with length of antenna wire. Do not connect the antenna to ground. If an outdvn,r antenna is used. it should not be longer than 100 feet, including lead-in. if it is longer, connect a 100

10、 to 200 mmf. capacitor in series with the lead-in. Power -Supply Polarity.-For operation on d -c, the power plug must be inserted in the outlet for correct polarity. If the set does not function, reverse the plug. On a -c, reversal of the plug may reduce hum. Steps Connect the high side of test- osc

11、illator to- Tune test-osc. to- Turn radio dial to- Adjust the fol - lowing for max. peak output- 1 12SK7 I -F grid in series with .01 mfd. 455 kc Quiet point at 1,600 kc end of dial C18 (2nd I -F trans.) 2 Tuning condenser stator (osc.) in series with .01 mid. C15 and C16 (1st I -F trans.) 3 Antenna

12、 term. of ant. trans. in series with 100 mmfd. 1,720 kc Full clockwise (out of mesh) C13 (oscillator) 4 1,400 kc Resonance on 1,400 kc signal C12 (antenna) Precautionary Lead Dress Green and blue leads from 1st I.F. transformer should be dressed apart and against chassis. Blue lead of the 2nd I.F. t

13、ransformer must be dressed against the shield and down between the tube socket and chassis. 3. Dress green diode lead away from 12SQ7 grid resistor and condenser. Replacement Parts Insist on genuine factory -tested parts, which are readily identified and may be purchased hom authorized dealers. STOC

14、K DESCRIPTION STOCK N DESCRIPTION CHASSIS ASSEMBLIES 32989 Socket-Dial lamp socket (RC -457D) 31319 Socket-Tube socket 30585 Spring-Drive cord spring 12720 Capacitor -100 mmfd. (C22) 32966 Transformcr -First I -F transformer 33584 Capacitor-.005 mfd. (Cl, C6) 34442 Transformer-Second I -F transforme

15、r 4937 Capacitor-.01 mfd. (C5) 34373 Washer-C washer for tuning shaft 4870 Capacitor-.025 mfd. (C7) 32787 4839 Capacitor-.05 mfd. (C8) Capacitor -0.1 mfd. (C9) SPEAKER ASSEMBLIES 34505 Capacitor -0.2 mfd. (C23) (39105-506) 32578 Capacitor-Electrolytic, comprising 1 section of 20 mfd. and 1 section o

16、f 12 mfd. (C19, C20). 35120 Cone-Cone, complete with voice coil 35115 Coil-Antenna coil 35611 Speaker -4 -inch dynamic speaker, complete with 33452 Condenser -2 -gang variable tuning condenser cone-less output transformer 35113 Control-Volume control and power switch. 34174 Transformer-Output transf

17、ormer 32834 Cord-Drive cord 35117 Drum-Tuning condenser drive drum 11785 Lamp-Dial lamp. MISCELLANEOUS ASSEMBLIES 31193 Lead-Antenna lead 14439 Resistor -100 ohms, watt (R12) 35122 Back-Cabinet back for Model 45X5 30880 Resistor -150 ohms, watt (R8) 35125 Back-Cabinet back for Model 45X6 13998 Resis

18、tor -22,000 ohms, watt (R1) 35124 Dial-Glass dial scale 12454 Resistor -33,000 ohms, watt (R9) 35123 Knob-Ivory tuning or volume control knob for 12284 Resistor -220,000 ohms, I watt (R8, R11) Model 45X6. 12285 Resistor -470,000 ohms, watt (R7) 35121 Knob-Walnut tuning or volume control knob 12679 R

19、esistor -2.2 meg., * watt (R4) for Model 45X5 13601 Resistor -10 meg., watt (R5) 35126 Spring-Retaining spring for knobs, Stock Nos. 35329 Shaft-Tuning shaft. 35121 and 35123 Additional Replacement Parts: Stock No. 35337 Coil-Oscillator coil 11909 Spring-Spring and fibre washer to take up play in drive shaft 收音机爱 好者资料库 RadioFans.CN