RCA-Victor-Co-Inc-18T 电路原理图.pdf

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1、PAGE 372-C MODEL 18T Chassis No. RC -511 Eight -Tube, Three -Band, AC, Superheterodyne Receiver Electrical Specifications PUSH-BUTTON RANGES One station between approximately 540-1,030 kc Two stations between approximately 610-1,250 kc Two stations between approximately 740-1,430 kc INTERMEDIATE FRE

2、QUENCY 455 kc One station between approximately 880-1,560 kc FREQUENCY RANGES Broadcast 540-1,560 kc Medium Wave 1.58-4.0 me Short Wave 5.8-18.0 me TUBE 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., and A -

3、F Amplifier (5) RCA-6SF5 Phase Inverter (6) RCA-6K6GT Power Output (7) RCA-6K6GT Power Output (8) RCA -5Y3 -G F.-NArr POWER SUPPLY RATINGS 105-125 volts, 50-60 cycles, 90 watts 105-125 volts, 25-60 cycles, 90 watts PILOT LAMPS (2) . Mazda No. 51, 6.3 volts, 0.20 amp. POWER OUTPUT RATING Undistorted

4、5.0 watts Maximum 5.5 watts LOUDSPEAKER (RL -79-A5) Type 6 -inch Electrodynamic V.C. Impedance 3.4 ohms at 400 cycles Mechanical Specifications Height Width Depth Cabinet Dimensions (inches) 113 18 103 Chassis Base Dimensions (inches) 21 63 16 Overall Chassis Height 101 Weight 253 lbs. (Shipping), 2

5、1i lbs. (Net) Tuning Drive Ratio Push Button Adjustment Six 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 insulated screwdriver or alignment tool such as RCA Stock No. 31031. Allow at

6、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 peaking during the final adjustment procedure. For loop operation, the link should be strapped across A an

7、d G terminals on back of set. In either case the procedure is as follows: 1. Make a list of the desired six stations, arranged in order from low to high frequencies. 2. Turn the range selector to A band, and manually trine in the first station on the list. 8. After turning range selector to PB posit

8、ion, push in station button No. 1 (extreme left). Then adjust the No: 1 oscillator core (L.14) to receive the station. It may be necessary to maintain approximate tracking between antenna and oscillator to receive weak stations. Approximate tracking will be indicated by noise, when tuned , 17 a stat

9、ion, which will disappear when the station is correctly tuned. 4. After oscillator core is adjusted properly, adjust C-8 for maxi- mum output. Clockwise adjustment of cores and trimmers tunes the circuits to lower frequencies. 5. Adjust for each of the five remaining stations in the same manner. 15.

10、1 6. Make a final careful adjustment of the oscillator cores and antenna trimmers. Owing to the relatively high RF gain, it may be found that there are several settings of each push-button magnetite core that will bring in any particular station. In such cases, it is advisable to unscrew the push-bu

11、tton loop trimmers to minimum capacity before adjusting the push-button magnetite coree. O OOOOOOp 850-156014145143011(1610-13505C/540-10305 (010 0I0 0r01 TR, MMERSCREWS C 6 6 4 j t CORE RODS I 0, LiNK ANT -ONO. TERMINAL EIOARD 1 1 ar- TO RLMOVL ACM, TAKE OVT TNL515-TWO SCREWS j CONNECTOR FOR VICTRO

12、LA POWER CHASSIS OR TELEVISION ATTACHMENT CORD 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 the oscillograoh are shown in the chassis drawing. Output Meter Alignment.-If this method is used, connect the meter across the voice coil, and turn the re

13、ceiver 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. Calibration for Alignment.-The proper dial calibration for align- ment purposes can b

14、e set up in two ways: 1. The dial may be removed from the cabinet by sliding out the two spring pieces which clamp it in its mounting position. The condenser plates should then be turned into full mesh, the pointer adjusted to the scratch at the left end of the dial back- ing plate, and the dial sli

15、pped under the pointer so that its extreme left calibration mark coincides with the pointer. The dial may be held in place with scotch tape. In this manner the actual receiver dial is used for alignment. When alignment is finished, the scale should be replaced including the fibre light shields which

16、 are folded under the ends of the glass scale. 2. A calibration scale is attached to the tuning drum. The correct setting of the gang, in degrees, for each alignment frequency is given in the alignment table. Check the position of the drum, making sure that the 0 degree scale mark is horizontal with

17、 the gang in full mesh. - Pointer for Calibration Scale.-If method (2) is used, improvise a pointer for the calibration scale by fastening a piece of wire to the LIS (6orTOM) L 20 (Top) 465 KC. AlifinmPnt Procedure PAGE 373-C 18T Cathode -Ray Alignment is the preferable method. Connections for chass

18、is, and bend the wire so that it points to the 0 degree mark on the calibration scale when the plates are fully meshed. Steps Connect high side of teat oscillator to- Tune test osc. to- Turn radio dial to- Adjust the follow - ing for maximum peak output- 1 6SK7 I -F grid in series with 0.01 mfd. 455

19、 kc A band Quiet Point between 550 and 750 kc L-21 and L-22 (2nd I -F Trans.) 2 6SA7 grid in series with 0.01 mfd. L-19 and L-20 (1st I -F Trans.) 3 Antenna terminal in series with 300 ohms (A antenna trimmer C-11, should be turn out) 15.2 me 15.2 me (149) C band C-24 (Osc.)* C-15 (Det.) Rock gang C

20、-1 (R -F) Rock gang 4 Antenna terminal in series with mmf. 2.44 mc 2.44 me (91.5) B band C-27 (Osc.) C-19 (Det.) 5 Antenna terminal in series with 200 mini.L-28 (Preset A osc. trimmer C-28 turn out) 800 kc 600 kc (33.2) A band Rock gang 6 Antenna terminal in series with 200 mmf. 1,500 kc 1,500 kc (1

21、63.4) A band C-28 (Osc.) C-20 (Det.) C-11 (R -F) 7 Repeat step 5, then 8 8 Antenna terminal in series with 300 ohms 15.2 me 15.2 me (149) C band C-1 (R -P ) Rock gang * Use minimum capacity peak if two can be obtained. Check to determine that C-24 has been adjusted to correct peak by tuning re- ceiv

22、er to approximately 14.29 me where a weaker signal should be received. Note.-Oscillator tracks above signal on all bands. To reduce sensitivity during RF Alignment connect a 15,000 ohm, watt resistor across secondary of 1st IF transformer. Calibratin Sole nnnnnnnllnnmlnnnnunmiilllnnnnminnnllnnnnnnnn

23、nnmlnnnnnnniiinimlunljnniliinnnIrnmlim 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 a = 5A51 600 1IAEIIjIAI B 900 IIf10 .1113.15.3u SPECIAL POLICE 1.6 AMATEUR 1.3 2.0 OUCE 2*5 AIRCRAFT TROPICAL 0.0 a A A A A A a A . . A AMATEUR 40 . . A . . . . -0. 3.5 SERVICES SHORT WAYS lentrom

24、MICA) OPOOKNAn 4666 OMAN N. ro II K .1A+no L NMWN11115 N. KONG Sri) PLD 110 LONDON PA/III TOKYO PITTtON seSUNPN ILA.71M aCHINr 10515 25M 511LIN LONDONA*IS AMTE 19 M N.YOSK PORE 1 O N PAIII salty 16 M LONDON A B Cwomrmemes 6 1 8 9 10 12 14 16 18 C . . a A a A , . . A a . a RA l . . . . A a A , . A A

25、A 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 I50 160 170 180 Receiver Dial Scales, and Corresponding Calibration Scales The corresponding position of the dial indicator for any setting of the calibration scale can be determined by drawing a line from this point on the bottom calibration scale

26、to the same point on the top calibration scale. For example, 33.2 on the calibration scale corresponds to 600 kc on A bank. Read instructions under Alignment Procedure. For proper dial calibration, the pointer should fall on the scratch mark on the dial backing plate with condenser fully meshed. Thi

27、s scratch is 3j inches from the left extremity of the plate. 收音机爱 好者资料库 RadioFans.CN PAGE 374-C I8T X g s X in ,n 4 4 e dr N apNO li i-ii-.A.A.,-,-11,sn =c_ = oE-11- N VN LP-Ter-4 6-14 Ole U a N N 13 8 S 1111-NA/V-111 2e d 2o$ I Cr uP H H 0u ua mo ()ex H 11 N d c2 an o i NOIL u u 11,m 0 mJ 00 N N 19

28、e u N N r 收音机爱 好者资料库 RadioFans.CN J FFf o U w J m O cc OvD Z z O J M01 -13A CZ D J m A m m U sl a 0 PAGE 375-C 18T o rc o :7c0 u f- % In re PAGE 376-C I 8T DIAL POINTER PULLEY DRIVE CORD SHOWN WITH GANG AT MAX. CAPACITY 3 TURNS DRIVE CORD DRUM ler (RENO Failure to Oscillate on Push -Button Tuning: S

29、hould a case of non -oscillation on any push- button range he experienced, check the oscil- lator grid leak to assure that it is 56,000 ohms. Some sets employed a 33,000 ohm leak which was occasionally found troublesome with low line voltage. Low -Frequency Oscillator Push -Button Coil: To ensure lo

30、w -frequency coverage on the push-buttmi oscillator coils in these models, a high -inductance coil, Stock No. 37133, is used for the 540-1,030 kc push-button oscillator ranges. -C LOOP TO SI -S2 ri F= Y O s a Ad t11 SEC. LOOP ANTENNA COIL. BLUE BLACK f C II ANT 1500 KC. .Tr CI -ANT. 15.2 MC, 0 BLACK

31、 GAD. TO CHASSIS HIOH-. MEDIUM) I LOWS SOFT 1e DO O - MEDIUM OFFS LOUKy v- -FULL f/ POWER -VOLUME k TONE HIOH TUNING CONTROL CONTROL CONTROL Replacement Parts Insist on genuine factory -tested parts, which ars readily Identified and may be purchased horn authorized dealer,. I (RC el U CPB RANGE SELE

32、CTO R STOCK o. DESCRIPTION STOCK DESCRIPTION CHASSIS ASSEMBLIES 13718 Resistor -2,200 ohm, * watt (RC -511) 14024 Resistor -2,700 ohm, i watt 34785 Board-Antenna-Ground board 14559 35875 Resistor -10,000 ohm, i watt Resistor -12,000 ohm, 3 watt 31292 Capacitor-Mica trimmer for loop-comprising 2 1269

33、5 Resistor -15,000 ohm, watt 36792 sections of 3-30 mmfd. Capacitor-Mica trimmer-comprising 2 sections 13998 12454 Resistor -22,000 ohm, Resistor -33,000 ohm, watt watt 35791 of 3 -SO mmfd. Capacitor -Mica trimmer-comprising S sections 12284 12285 Resistor -220,000 ohms i watt Resistor -470,000 ohm,

34、 i watt of 8-80 mmfd. 12879 Resistor -2.2 megohm, i watt 13001 Capacitor -8.2 mmfd. 13601 Resistor -10 megohm, i watt 35804 Capacitor-Mica trimmer -comprising 1 section 14350 Screw-No. 8-32 square -head set -screw for drum of 10-160 mmfd., 2 sections of 25-250 mmfd., 35797 Shaft-Tuning shaft and pul

35、ley 2 sections of 50-400 mmfd, and 1 section of 31364 Socket-Dial lamp socket 100-540 mmfd. 35787 Socket-Phonograph input socket 12896 Capacitor-lb mmfd. 31251 Socket-Tube socket 15057 Capacitor -88 mmfd 31418 Spring-Drive cord spring 34.899 12720 Capacitor -100 mmfd. (in lat I.F. can) Capacitor -10

36、0 mmfd. 35802 Switch-Push button switch-lees coils and trimmer 34700 Capacitor -120 mznfd. 35793 Switch-Range switch 13003 Capacitor -180 mmfd. 36249 Switch-Tone switch 12952 Capacitor -330 mmfd 35836 Transformer-First I,F transformer 35877 Capacitor -720 mmfd. 35790 Transformer-Second I.F. transfor

37、mer 34787 13895 34459 SSbB! Capacitor -2,850 mmfd. Capacitor -5,600 mmfd. Capacitor-.0025cycle Capacitor-.006 mfd.id, 35588 35800 Transformer-Power transformer, 110 volt, 25 Transformer-Power transformer, 110 volt,. 80 cyycle 32787 12484 Capacitor-.05 mfd. Capacitor -0.25 mfd. 33726 Washer-C washer

38、for tuning shaft 33014 Capacitor-Electrolytic-comprising S sections SPEAKER ASSEMBLIES 35785 of 10 mfd. and i section of 20 mfd. Coil-Loop primary (Ll) (RL79A5) 35803 Coil-Push button oscillator coil 35849 Cap-Speaker cone dust cap 35789 Coil-Oscillator coil 35810 Coil Field coil, ohm 35606 Coil-R.

39、F. coil 35441 Cone-Cone completelets with voice coil 35796 Condenser-Variable tuning condenser 35809 Transformer-Output transformer 35807 Control-Volume control (i meg.) and power switch MISCELLANEOUS ASSEMBLIES 38250 Control-Volume control (2 meg.) and power 35813 Bezel-Push button bezel switch 358

40、12 Button-Push button (dark brown) 32654 Cord-Drive cord 38300 Button-Push button (light brown) 35788 Core-Core and stud for oscillator coil 35914 Decalcomania-Control panel decal 35795 Dial-Calibrator dial 35392 Decalcomania-RCA Victor decal 35794 Drum-Tuning condenser drive drum-lees cali- 35811 D

41、ial-Glass dial scale brator 35814 Knob-Range or tone switch knob (dark brown) 35799 Frame-Dial frame complete-less dial scale 38297 Knob-Range or tone switch knob (light brown) 85798 Indicator-Station selector indicator 35775 Knob-Tuning or volume control knob (dark 35786 Loop-Antenna loop winding b

42、rown) 35784 Loop-Complete antenna loop with trimmer, coil and Antenna -Ground board 38298 Knob-Tuning or volume control knob (light brown) 13988 Resistor -10 ohm, i watt 11785 Lamp-Dial lamp 13220 Resistor -58 ohm, i watt 38149 Marker-Push button marker 14439 Resistor -100 ohm, i watt 30900 Spring-Retaining spring for knobs, Stock No. 35885 Resistor -470 ohm, 2 watt 35814