RCA-Victor-Co-Inc-27K 电路原理图.pdf

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1、PAGE 42i-C MODEL 21K Chassis No. RC -567 Seven -Tube, Two -Band, AC, Superheterodyne Receiver Electrical Specifications FREQUBNCY RANGES Standard Broadcast 540-1,600 kc Short Wave 9.4-15.9 me INTERMEIDIATE FREQUENCY 455 kc PUSH-BUTTON RANGES One station between approximately 540-1,030 kc One station

2、 between approximately 610-1,250 kc Two stations between approximately 740-1,430 kc One station between approximately 880-1,600 kc TUBA COMPLEMENT (1) RCA-6SK7 R -F Amplifier (2) RCA-6SA7 1st Detector -Oscillator (3) RCA-6SK7 I -F Amplifier (4) RCA-6SQ7 2nd Detector, A.V.C. (5) RCA-6SQ7 A -F Amplifi

3、er (6) RCA-6K6GT Power Output (7) RCA -5Y3 -G Rectifier PILOT LAMPS (2) Mazda No. 51, 6.3 volts, 0.20 amp. Push Button Adjustment The station push buttons connect to separate magnetite -core oscil- lator coils and separate antenna trimmers which must be adjusted for the desired stations. Use an insu

4、lated screwdriver or alignment tool such as RCA Stock No. 31031. Allow at least five minutes warm- up period before making adjustments. In the event that the receiver is to be used with an external an- tenna use one or two feet of wire (as an antenna) to ensure sharp licaking during the final adjust

5、ment procedure. For loop operation, the nk should be strapped across terminals on back of set. In either case the procedure is as follows: 1. Make a list of the desired stations, arranged in order from low to high frequencies. 2. Turn the range selector to A band, and manually tune in the first stat

6、ion on the list. 3. After turning range selector to PB position, push in station button No. 1 (extreme left). Then adjust the No. 1 oscillator core (L-15) to receive the station. 4. After oscillator core is set correctly, adjust C-37 for maximum output. Clockwise adjustment of corea and trimmers tun

7、es the circuits to lower frequencies. 5. Adjust for each of the remaining stations in the same manner. 6. Make a final careful adjustment of the oscillator cores and an- tenna trimmers. On the 880 to 1,600 kc push-button, the higher frequency stations may be received with L-11 either in or out (osci

8、llator frequency either 455 kc below or 455 kc above the station frequency). The adjust- ment with this core in its out position (oscillator frequency 455 kc above the station frequency) is the correct one. 180 170 160 150 140 130I 120 110 100I90 POWER OUTPUT RATING Undistorted 2.5 watts Maximum 4.5

9、 watts LOUDSPEAKER (RL -70-L5) Type 12 -inch Electrodynamic V.C. Impedance 2.2 ohms at 400 cycles POWER SUPPLY RATINGS 105-125 volts, 50-60 cycles, 90 watts 105-125 volts, 25-60 cycles, 90 watts Universal, 40-60 cycles, 90 watts Height Width Depth Cabinet Dimensions (inches) 38 2611 . 12 Chassis Bas

10、e Dimensions (inches) 211 18 . 6q Overall Chassis Height 711 Tuning Drive Ratio 10-1 Weight (Net, 41 lbs.) (Shipping, 56 lbs.) 550-1500 KC 740-1430 KC 310-1wq MO -t030 KC I KC TRINAIYI-ZND SCREWS 0 0 e 4 3 L 1 CORE 0 0 0 I 0 RODS 80 70 60 50 40 30 20 IO 0 STAr1DARD BROADCAST 0 lOO 120 .14.9. 160 a R

11、c,4 Vie_oe - s g3 T T r 7 T T r 1 g t t e t 1 1 1 1 1 31 10 II 25 m SHORT WAVE 1g1I lip / 1 13 14 19m) 27 K 1111111IIIIIII11111111II111II11111II911i11TI11IIII IIIpIII 111111111111111111I11111111p111111111I111IIIIII111I111111111111111I1IIII1III111III,IIIIIIIIIIIlIII11111111 180 170 160 150 140 130 12

12、0 110 100 90 80 70 60 50 40 30 I 20 10 0 RCA VICTOR DIVISION OF RADIO CORPORATION OF AMERICA, CAMDEN N. J., U. S. A. 收音机爱 好者资料库 RadioFans.CN PAGE 422-C 27K Alignment Procedure Cathode -Ray Alignment is the preferable method. Connections for the oscillograph are shown in the schematic drawing. Output

13、 Meter Alignntent.-If 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

14、-v -c action. Calibration Scale on Indicator -Drive -Cord Drum.-The tuning dial is fastened in the cabinet and cannot be used for reference during alignment, therefore a calibration scale is attached to the indicator. drive -cord drum which is mounted on the shaft of the gang condenser. The setting

15、of the gang condenser is read on this scale, which is calibrated in degrees. The correct setting of the gang in degrees, for each alignment frequency, is given in the alignment table. As the first step in r -f alignment, check the position of the drum. The 90 mark on the drum scale must be vertical,

16、 and directly under the center of the .gang -condenser shaft when the plates are fully meshed. The drum is held to the shaft by plastic cement which must be tight when the drum is in the correct position. To determine the corresponding frequency for any setting of the calibration scales, refer to th

17、e accompanying drawing which shows the dial with 0-180 calibration scales drawn at top and bottom. Pointer for Calibration Scale. - Improvise a pointer for the cali- bration 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 ca

18、libration scale when the plates are 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 Ice mark, and gang condenser fully meshed. The indicator has a spring clip for attachment to the cable. L

19、7- 80T TOM LS - TOP 455 KC. 4 DUMMY TERM C5 :CANT. 9.5 MC. e CII-OSC. 500 KC - BOTTOM viEW 27 K Le -BOTTOM LIO- TOP 455 KC. L6 24.05C 600 KC Steps Connect high side of test oscillator to- Tune test osc. to- Turn radio dial to- Adjust the follow - ing for maximum peak output- 1 6SK7 I -F grid in seri

20、es with 0.01 mid. 455 kc A Band Quiet Point between 550 and 750 kc L9 and L-10 (2nd I -F Trans.) 2 6SA7 grid in aeries with 0.01 mid. L-7 and L-8 (1st I -F Trans.) 3 Yellow loop lead in series with 200 mini. 1,500 kc A Band 1,500 kc (20) C-11 (oat.) 4 600 kc A Band 600 kc (149.5) L-6 (osc.) 6 Antenn

21、a terminal in serieswtfh 47 mini. (link open) 15.2 me C Band 15.2 me (13.6) C-10 (osc.) C-4 (ant.) 6 9.5 me C Band 9.5 me (148) C-5 (ant.) (Rock gang) Radiation loop consisting of two turns of wire 18 inches in diameter located 4 to 6 feet from receiverRepeat 1,500 kc ABand 1,500 kc C-1 (on loop) 8

22、600 kc 600 kc L-6 (osc.) (Rock gang) steps 7 and 8. Use minimum capacity peak if two can be obtained. Note.-Oscillator tracks 455 kc above signal on all bands. External Antenna.-For best reception on C band with an ex- ternal antenna, peak the trimmer on, C atenna coil for maximum output on a statio

23、n in the 31 -meter band. srY1 Ns WWI FULL i, LOUP POWER -VOLUME RADIO -PHONO T i iw. wiv TUNING RANGE CONTROL TONE CONTROL CONTROL CONTROL 收音机爱 好者资料库 RadioFans.CN PAGE 423-C 27K 0 O z 1 m8 9 0 e N tl1 g- U O LLtA U A od 04O ,Jr NI- oo e o 1 o O re N N r. / I NN Uct IH o tA co O I JJn 0 e Z00 O toU 0

24、 0 U JF NO N Q N r- Nd V N o N UO -1E4 HN. z LL. f 60 Zw Vi ZF II10 0,= fu- O FV X c- r 2 N Y li (1ir - Q N ,-; o Q ! J F J Q uww *O ro m Leto t4 o - I HM. x w -.o 000 tg mtn 9Z 4 F 000r U -IM a I N S O R) Q vo UdZ 2 = r 0 s + a o O c9 8 1 $Vui iM ec: O0 92 1HI O ._. $ jj *u1d V * J.049 , i t U Ht-

25、o r- N 0 CC (el luvo, u to . O N,0 d i o g t. Doe 6 J-oCi 11gLL p O 4 - r O.p U L1 o tno 0 o m triti a r m c -r te WE dU N m Q z o 收音机爱 好者资料库 RadioFans.CN PAGE 424-C 27K Replacement Parts Insist on genuine factory -tested perb, which are readily Identified and may be purchased has authorized dealers

26、. STIOoCK DESCRIPTION STOCK DESCRIPTION CHASSIS ASSEMBLIES 31251 Socket-Tube socket (RC -567) 31418 Spring-Cord spring 36988 32145 Board-Antenna-Ground board Capacitor-Electrolytic-4 mfd., 450 volts Yt 12007 38789 Spring-Retaining spring of oscillator coil ad - justablepo core and stud Support-Drive

27、 cord pulley support complete 38571 Capacitor-Electrolytic comprising 2 sections of with pulley 10 mid., 400 volts and 1 section of 20 mid., 38792 Switch-Range switch 25 volts 38791 Switch-Tone control switch 35791 Capacitor-Mica trimmer comprising S sections 35638 Transformer-First I.F. transformer

28、 . of 8-80 mmfd. 35790 Transformer-Second I.F. transformer 38388 Capacitor-Mica trimmer -50-350 mmfd. for C band antenna coil 35588 Transformer-Power transformer -105.120 volts, 25 cycle 13057 Capacitor -68 mmfd. 35959 Transformer-Power transformer -105-120 volts, 34899 Capacitor -100 tumid. 50-80 c

29、ycle, less end shields 34700 Capacitor -120 mmfd. 35969 Washer-C washer for tuning shaft 12725 Capacitor -150 mmfd. 13003 38858 Capacitor -180 tumid. Capacitor -220 mmfd. SPEAKER ASSEMBLIES 30433 Capacitor -470 mmfd. (RL -70L-5) 38831 Capacitor -630 mmfd. 44338 Capacitor -2,200 mmfd. 13867 Cap-Dust

30、cap 30303 Capacitor-.0035 mid. 12079 Coil-Field coil -1,060 ohms 33584 Capacitor-.005 mfd. 11469 Coil-Neutralizing coil 49$7 Capacitor-.O1 mid. 36145 Cone-Cone complete with voice coil 32787 Capacitor-.05 mid. 5118 Plug -3 -prong male speaker plug 4839 Capacitor -0.1 mid. 36146 Suspension-Metal cone

31、 suspension 38788 Coil-Antenna coil-C band 31301 Transformer-Output transformer 38829 Coil-Coil and resistor -10,000 ohms 38787 Coil-Oscillator coil MISCELLANEOUS ASSEMBLIES 38786 Condenser-Variable tuning condenser 38404 Control-Volume control and power switch 38375 Button-Push button 34662 Cord-Po

32、inter cord (approx. 54 in. overall lgth.) 38684 Capacitor-Mica trimmer -2-20 mmfd. 35788 Core-Adjustable core and stud for oscillator coil 35869 Capacitor-Mica trimmer comprising 1 section of 38359 Cup-Oscillator coil mounting cup 10-160 mmfd., 2 sections of 25-250 mmfd., 1 36397 Dial-Drive drum cal

33、ibrator section of 50-400 mmfd., and 1 section of 38790 Drum-Drive drum-less calibrator 100-540 mmfd. 5119 Plug -3 -contact female plug for speaker cable . Plug for 38584 Channel-Rubber channel for dial scale 32641 38579 Coil-Loop primary coil -3 -prong male plug selector switch cable 38315 Coil-P.B

34、. oscillator coil-high frequency 38832 Plug-Pin plug for antenna loop leads 37638 Coil-P.B. oscillator coil-low frequency 31373 Pulley-Drive cord pulley 35871 Core-Adjustable core and stud for P.B. oscil- 38857 Resistor -390 ohms, 2 watt lator coils 14720 Resistor -1,000 ohms, watt 38798 Decalcomani

35、a-Control panel decal 12312 Resistor -3,300 ohms, watt 38794 Dial-Glass dial scale 35875 Resistor -12,000 ohms, 3 watt 38793 Escutcheon-Dial scale and push button es - 3219 Resistor -18,000 ohms, j watt cutcheon-less dial and buttons 12412 Resistor -47,000 ohms, watt 38795 Indicator-Station selector

36、 indicator 30787 Resistor -47,000 ohms, watt 35814 Knob-Control knobs 30850 Resistor -56,000 ohms, watt 11891 Lamp-Dial lamp 30651 Resistor -270,000 ohms, watt 38578 Loop-Antenna loop complete 30648 Resistor -470,000 ohms, watt 34317 Marker-Station selector markers 30649 Resistor -2.2 meg., watt 337

37、74 Mounting-Speaker mounting hardware 30992 Resistor -10 meg., watt 38580 Pivot-Loop support and pivot-on top of loop 38589 Shaft-Tuning knob shaft frame 35772 Shield-Bottom shield for power transformer, 36422 Socket-Loop cable or switch cable socket No. 35959 30900 Spring-Retaining spring for knobs 35709 Shield-Top shield for power transformer, No. 34053 Spring-Retaining spring for push button 35959 38581 Support-Loop bracket and support-on bottom 31384 Socket-Dial lamp socket of loop frame 35787 Socket-Phono input socket 38797 Switch-Selector switch