RCA-Victor-Co-Inc-Q24 电路原理图.pdf

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1、PAGE 402-C MODEL 024 Six -Tube, Five -Band, AC -DC, Superheterodyne Receiver Chassis No. RC -508 Electrical and Mechanical Specifications FREQUENCY RANGES Standard Broadcast (A Band) 540-1,720 kc (556-174 m) Medium Wave (B Band) 3.0-9.5 mc (100-31.6 m) 31 Meter Spread Band 9.5-11.7 mc (31.6-25.6 m)

2、25 Meter Spread Band 11.7-15.1 mc (25.6-19.9 m) 19-13 Meter Spread Band 15.1-22.5 mc (19.9-13.3 m) INTERMEDIATE FREQUENCY 455 kc TUBE COMPLEMENT (1) RCA -125A7 1st Detector-Oscillator (2) RCA -12C8 I -F Amplifier, 2nd Detector, A.V.C. (3) RCA-12SC7 A -F Amplifier, Phase Inverter (4) RCA-50L6GT Power

3、 Output (5) RCA-50L6GT Power Output (6) RCA-35Z5GT Rectifier TONE CONTROL POWER -VOLUME TUNING RANGE CONTROL CONTROL CONTROL POWER SUPPLY RATINGS 105-125 volts A -C 40-100 cycles or D -C 50 watts 160-180 volts A -C 40-100 cycles or D -C 55 watts 210-250 volts A -C 40-100 cycle:or D -C 65 watts LOUDS

4、PEAKER (RL -92-1 ) Type 6 -inch permanent magnet dynamic V. C. Impedance at 400 cycles 3.4 ohms POWER OUTPUT Undistorted 3 watts Maximum 3.5 watts Model Q24 Controls Replacement Parts Insist on genuine factory -tested pests, which are seedily dentllied and may be purchased Irons authorized dealers.

5、STOCK DESCRIPTION STOCK DESCRIPTION CHASSIS ASSEMBLIES 18190 Resistor -47 ohms, 1 watt (RC -508) 35711 Resistor -100 ohms, 4 watts 2736 Resistor -180 ohms, 1 watt 35635 Ballast-Ballast resistor (M-91462-2) 32165 Resistor -470 ohms, 2 watts 35640 Bracket-Bracket with one pulley for indicator 3526 Res

6、istor -2,200 ohms, I watt cord 30494 Resistor -4,700 ohms, I watt 35822 Bracket-Flywheel and shaft mounting bracket. 30128 Resistor -12,000 ohms, I watt 35639 Bracket-Long bracket with three pulleys for 12759 Resistor -15,000 ohms, I watt indicator cord 13998 Resistor -22,000 ohms, watt 12714 Capaci

7、tor-Medium air trimmer (C4, C5) 12454 Resistor -33,000 ohms, I. watt 34654 Capacitor-Mica trimmer -comprising 3 sections 30651 Resistor -270,000 ohms, I watt (Cl, C3, C6) 12285 Resistor -470,000 ohms, I watt 35648 Capacitor -6 mmfd. 13730 Resistor -1 meg., I watt 33099 Capacitor -15 mmfd. . 12679 Re

8、sistor -2.2 meg., I- watt 31350 Capacitor -18 mmfd 13601 Resistor -10 meg., I watt 35644 Capacitor -47 mmfd., ceramic 35633 Shaft-Range switch indicator knob shaft. . 13141 Capacitor -47 minfd., moulded 35637 Shaft-Tuning shaft 30949 Capacitor -56 mmfd., mica (I -F) 35634 Socket-Ballast resistor soc

9、ket (Remove terminals 12723 Capacitor -56 mmfd., moulded not required.) 35645 Capacitor -68 tumid., ceramic 31639 Socket-Dial lamp socket 13057 Capacitor -68 mmfd., mica 31251 Socket-Tube socket 30904 Capacitor -100 mmfd., mica (I -F) 33742 Socket-Phono. input socket 12720 Capacitor -100 tumid., mou

10、lded 13638 Spring-Drive spring 12694 Capacitor -220 mmfd. 35621 Switch-Range switch 31433 Capacitor -560 mmfd. 35636 Transformer-First I -F transformer-less grid 35643 Capacitor -3,000 mmfd. lead and clip 33806 Capacitor-.0015 mfd. 35628 Transformer-Second I -F transformer 5107 Capacitor-.0025 mf d.

11、 35635 Tube-Ballast resistor 4838 Capacitor-.005 mfd._ 33726 Washer-C washer for pulley, Stock No. 35630 4858 Capacitor-.01 mfd., 500 volts 14393 Capacitor-.01 mfd., 1,000 volts SPEAKER ASSEMBLIES 4870 Capacitor-.025 mid. (RL -92-1) 5196 Capacitor-.035 mfd. 4839 Capacitor -0.1 mfd. 32907 Cap-Dust ca

12、p 33824 Capacitor-Electrolytic comprising two sections 36077 Cone-Cone complete with voice coil of 40 mfd., one section of 10 mfd. and one 5118 Plug -3 -prong male plug for speaker section of 20 mfd. 35940 Transformer-Output transformer. . 35632 Coil-Antenna coil-A band 35631 Coil-Antenna coil-sprea

13、d band MISCELLANEOUS ASSEMBLIES 35623 Coil-Oscillator coil-A and B bands 35624 Coil-Oscillator coil -19-13 meter band 35655 Back-Back cover-less power cord 35625 Coil-Oscillator coil -25 meter band 32836 -Cord-Power cord complete with plugs 35626 Coil-Oscillator coil -31 meter band 35392 Decalcomani

14、a-RCA Victor decal 35619 Condenser-Variable tuning condenser 35712 Dial-Glass dial scale 35629 Control-Tone control 35911 Frame-Dial frame complete except-less pointer 35620 Control-Volume control and power switch and dial 32635 Cord-Condenser drive cord 35648 Indicator-Station selector indicator 34

15、862 Cord-Indicator drive cord. 35652 Knob-Band indicator knob 35642 Dial-Calibrator dial for drive drum 35651 Knob-Range switch knob 35627 Drum-Tuning condenser drive drum-less can- 35650 Knob-Tone control knob brator 35955 Knob-Volume control or tuning knob 35838 Flywheel-Tuning shaft flywheel 3597

16、6 Lamp-Dial lamp 5119 Plug -3 -contact female plug for speaker cable. 35653 Mounting-One set speaker mounting hardware. 35641 Pulley-Indicator cord pulley 14270 Spring-Retaining spring for knobs, Stock Nos. 35630 Pulley-Pulley operating between the tuning shaft 35650, 35955, and 35651 and drive drum

17、 4982 Spring-Retaining spring for knob, Stock No. 35835 Resistor-Ballast resistor (M-91462-2) 35652 - 收音机爱 好者资料库 RadioFans.CN PAGE 402-C Alignment Procedure Cathode -Ray Alignment is the preferable method. Connections for the oscillograph are shown in the chassis drawing. Output Meter Alignment. -If

18、 this method is used, connect the meter across the voice coil, and turn the receiver volume control to maximum. Test -Oscillator. -For all alignment operations, connect the low side of the test -oscillator to the receiver chassis, and keep the output as low as possible to avoid a -v -c action. Calib

19、ration Scale on Indicator -Drive -Cord Drum -The tuning diai is fastened in the cabinet and cannot be used for reference during align- ment, therefore a calibration scale is attached to the indicator -drive - cord drum which is mounted on the shaft of the gang condenser. The setting of the gang cond

20、enser is read on this scale, which is calibrated in degrees. The correct setting of the gang in degrees, for each align- ment frequency, is given in the alignment table. 1 o determine the corresponding frequency for any setting of the calibration scales, refer to the accompanying drawing which shows

21、 the dial with 0.180 calibration scales drawn at top and bottom. Pointer for Calibration Scale. -Improvise a pointer for the calibra- tion scale by fastening a piece of wire to the gang -condenser frame, and bend the wire so that it points to the 180 mark on the calibra- tion scale when the plates a

22、re fully meshed. Dial -Indicator Adjustment. - After fastening the chassis in the cabinet, attach the dial indicator to the drive cable with indicator at the 540 kc mark, and gang condenser fully meshed. The indicator has a spring clip for attachment to the cable. LI TOP L2 BOTTOM ADJ. 455KC L3 BOTT

23、OM L4 TOP ADJ 455KC BALLAST RESISTOR Tube and Trimmer Location Dial -Indicator and Drive Mechanism Spread -Band Alignment. -The most satisfactory method of aligning or checking the spread -band ranges is on actual reception of short- wave stations of known frequency, by adjusting the magnetite -core

24、 oscillator coil for each band so that these stations come in at the correct points on the di.t When a test oscillator is employed for spread -band alignment, a final check should be made on actual reception of short-wave stations of known frequency, and the magnetite -core oscillator coil for each

25、band should be re -adjusted so that the stations come in at the cor-.ct points on the dial. For additional information, refer to booklet RCA Victor Receiver Alignment. Precautionary Lead Dress. - 1. All leads between antenna coils and switch must be as short as possible and kept away from oscillator

26、 coil, leads and switches. 2. All oscillator coil leads must be kept apart from each other and other leads and parts. 3. Blue plate lead of 2nd I -F should be dressed under other leads and against chassis. 4. Filament lead of 5OL6GT should be dressed against chassis and away from 12SC7 socket. Steps

27、 Ste a Connect the high side of the test-osc. to- Tune teat- osc. to- Range switch Turn radio dial to- Adjust the fol - lowing for max. peak output 1 12C8 I -F grid in series with .01 mid. 455 kc A Quiet Point near 180 L9 and L4 2nd I -F Trans. 2 12SA7 1st Det. grid in series with .01 mid. L1 and L2

28、 1st aI-F 3 Ant. lead in series with 300 ohms 11.8 me 25M 138.5 L5 (ant.) Cl (ant.) 4 15.2 me 17 C2 (osc,) 5 Repeat steps 3 and 4 6 15.2 me 19-13M 158 L8 (onc.) 7 9.5 me 31M 158 L7 (osc.) C3 (ant.) 8 9.5 me B 11.5 C4 (osc.) 9 Ant. lead in series with 200 min/. 1,500 kc A 26 C5 (ant.) CO (ant.) 10 80

29、0 kc 150 L8 (osc.) (Rock gang) 11 Repeat steps 9 and 10 * Use minimum capacity peak if two can be obtained. Check image to determine that C2 has been adjusted to the correct peak by tuning receiver to approximately 14.29 me (29) where a weaker signal should be received. *Peak at minimum position of

30、plunger if two peaks can be obtained. *Peck at minimum capacity if two peaks can be obtained. NOTE: Oscillator tracks above signal on all bands. 1150 170 1e0 150 140 130 120 110 100 90 eo 70 60 50 40 30 20 10 0 31 (7 MU CIO o o M. : Ous o s.1.1.10, o M. ala 9.8 10 0 10.5 11.0 11.8 mc 31 B2.9 3.2 3.8

31、 4 4 - 5.4 _ 6,6 1.8 9.5 mc B 25 ( rem Z. 0 Ten o o sol, . 12 .1 12 . 5 . 13 . O. , .110 0 15 . 5 m c 25 A 550 600 100 800 1000 1200 1400 1700 kc A 19-13 . O O .a Ma . o O ussM ISMw 0 o Ism o os M an 1. MnMf giln.118 eso 16.0 17.0 1.%18.2 19.5 ZV I I4 RIMS I, MUM 1 IIIII III11111n11111III1111I111111

32、I11111I11n111n111111111In11111I III11111I In1II11IIIIIII IIIIIII II III11111111IpIIp111IIlIIIII IIIII IIIII III IIIIIIIIIIIIII IIIIIIIIIIIIIIIIIII AO ITO 180 ISO 140 130 120 110 100 00 80 70 60 50 40 30 20 10 0 Calibration Scale Reduced Reproduction of Receiver Dial and Corresponding 0-180 Calibrati

33、on Scales BALLAST RESISTOR No.91462-t POSITION OF LUG FOR 210-280 voLTS5 FOR 160-200 VOLTS 1 cosmos -1215 VOLTS t ev- ms-4s 收音机爱 好者资料库 RadioFans.CN PAhE 403-C 2 88 . % O Gti J 89 s o N p O 8a O,O h k F z 1 Q F W Y S o0r F- n h eft. u0/0 T * o c:i Cj 2 t r , )er/he iPv 2 v a F- L N m I/ 00$ JI -;i I MI 8 Qzz o l s n 1 I V _ m v= F rn._ g a il N m ll re 8 N a A aN ua I I G If a p V u 1, le r N N $1u. - Q24 收音机爱 好者资料库 RadioFans.CN