RCA-Victor-Co-Inc-R-71 电路原理图.pdf

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1、PACE 304-B MODELS R71 50-60 Cycles, 80 Watts Type of CircuitSuper -Heterodyne Type and Number of Radiotrons3 RCA -58, 3 RCA -56, 1 RCA -247, and 1 UX-280-Total 8 Number of R. F. StagesOne Number of I. F. StagesOne Type of Second DetectorPower Self Biasing Type of Tone ControlVariable resistance in s

2、eries with condenser that tunes secondary of interstage transformer at low position Type of Automatic Volume ControlRCA -56 controlling R: F. and I. F. stages by means of drop across resistor in plate circuit constituting bias on R. F. and I. F. stages.Manual volume control varies grid bias on A. V.

3、 C. tube Number of Audio StagesOne-Single Pentode Type of RectifierFull Wave, UX-280 Undistorted Output2 25 Watts Model R-71 is a table type receiver and the R-72 is of the Console type.Except for the loud- speaker, both models are identical.The R-71 uses a six inch speaker while the R-72 uses an ei

4、ght inch unit. Alignment Procedure STEP CONNECT HI al SIDE OF TEST OSCTO - TUNE TEST OSC TO - MEC RADIO DIAL TO ADJUST THE FOLLOKING FOR MAX. OUTPUT 1 I- F Grid In series vd tn 0.011Erd 175 Kc Qii et point near 600 KC S R -F -front Det.-Middle, Osc.-Rear.goo Xc Trimmer reached from top front of chas

5、sis. C NS IWO. co .01 PM. MAW. RESISTOR BOARD CONNECTIONS INTERNAL CONNECTIONS OF POWER TRANSFORMER 111111. IIITIMITAIK 7- I 111/1711ITT-3 -as-,.-eurs- ma. C ea -up -AL111.401. INTERNAL CONNECTIONS Of AU010 TRANSFORMER KC BROM- -I.sem Iwo on n- IA705=outst no- +147FOOZDA- Jet I Mt, n -141M-11461E-w,

6、 in, ID 1111211AL COMIECT101131f IMASS CURATOR INTERNAL CONNECTIONS OF In LE TUINFORMER to INTERNAL CONNECTIONS OF END LE TRANSFORMER 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 305-B R71 0001 ti R N 11111 4 11111 aQ kn T J0000. ,zA 0000%

7、2tri s .0f. ;100000 It I t:,s 00000 )- e,43 4 4 _0.0,000 .011, d H1111111111 . o a 收音机爱 好者资料库 RadioFans.CN PAGE 306-B R71 8, R72 REPLACEMENT PARTS Stock No. DESCRIPTION Stock N o. DESCRIPTION RECEIVER ASSEMBLIES 7054 Cord-Power cord. 2563Resistor -6,000ohms-Carbontype -1 watt-7062 Capacitor-Adjustab

8、le capacitor -15 to 70 mmfd. Package of 5 7362 Capacitor -0.025 mfd.-Located on resistor board. 2746Socket-Dial lamp socket 7439 Drum-Dial drum with set screws. 2747Cap-Grid connector cap-Package of 5 7440 Scale -Tuning dial scale 2749Capacitor -2,400 mmfd 7441 Escutcheon - Stationselectorescutcheon

9、 with 3003Cushion-Sponge rubber cushion for mounting re- mounting screws ceiver chassis-Package of 4 7484 Socket -5 -contact radiotron socket -4 used 3048Resistor -500,000 ohms-Carbon type -5 watt- 7485 Socket -6 -prong radiotron socket -3 used Package of 5 7487 Shield-Radiotron shield -6 used-Plain

10、 finish 3076Resistor -1 megobm-Carbontype -34 watt- Package of 5 7488 Shield-Radiotron shield top -1 used-Plain finish. 3252Resistor -100,000 ohms-Carbon type -34 watt- Package of 5 7501Capacitor-3.gang variable tuning capacitor-Less drive shaft and drum 3360Resistor -150,000 ohms-Carbon type -34 wa

11、tt- Package of 5 7502 Capacitor pack-Comprising one 10. mfd., one 1 mfd., two 0.5 mfd., one 8. mfd., five 0.1 mfd., one 0.3 mfd. and one 4. mfd. capacitors in metal con - 6113 Foot-Cabinet felt foot-Package of 15tainer 6142Resistor -6,000 ohms-Carbon type -3f watt- Package of S 7504Coil -1st detecto

12、r and oscillator coil complete with mounting bracket 6186Resistor -500.000 ohms-Carbon type-X watt- 8837Su pport-Receier chassis metal mounting support Package of 5 -Package of 4 6188Resistor -2 megohm-Carbontype -3.iwatt- Package of 5 8917 Transformer-Audio transformer assembly compd.- ing intersta

13、ge and output transformer in metal 6192Spring-Condenserdrivecordtensionspring- container Package of 10 8918 Transformer-Power transformer -110-120 volts - 6250Resistor -4,000 ohms-Carbon type -34 watt- 50-60 cycles Package of 5 8922 Transformer-Power transformer -110-120 volts - 6288Knob-Station sel

14、ector-Volume control ortone 25-50 cycles control knob-Package of 5 8923 Transformer-Power transformer -220-240 volts - 6298Cord-Tuning condenser drive cord-Package of 5. 50-60 cycles 6300 Socket -4 -prong radiotron socket -1 used 6301Reactor-Filter reactor 6302Bracket-Dial lamp bracket assembly R-71

15、 REPRODUCER ASSEMBLIES 6303Resistor -20.000 ohms-Carbon type -34 watt- Package of S 2975 Rivet-Cone retaining ring mounting rivet-Pack- age of 100 6304Resistor -170 ohms-Carbon type-X watt-Pack- age of 5 3237Screw assembly-Reproducer mounting screw assent - bly-Comprising 4 screws, 8 nuts, 4 washers

16、 and 4 eyelets-Package of 1 set 6306Resistor -14,000 ohms-Carbon type -1 watt- Package of 5 6182 Board-Terminal board with three terminals-Pack age of 5 6307Tone control complete with mounting not 6308Coil-R. F. coil 8702 Ring-Cone retaining ring 8921 Cone-Reproducer cone with voice coil-Package 630

17、9 Transformer -1st intermediate transformer of 5 6310Transformer -2nd intermediate transformer 9417 Coil-Reproducer fieldcoil assembly-Comprising 6311 Board-Resistor board less resistors and capacitors coil, eons housing and magnet 6312 Capacitor -650 mmfd.-Oscillator series capacitor- Package of S

18、R.72 REPRODUCER ASSEMBLIES 6315Resistor -45.000 ohms-Carbon type -34 watt- Package of S 3237Screw assembly-Reproducer mounting screw assent - bly-Comprising 4 screws, 8 nuts, 4 washers and 6317 Capacitor -0.05 mfd. capacitor 4 eyelets-Package of 1 set 6318Resistor -10,000 ohms -20 watt 6184 Board-Te

19、rminal board -3 terminals 8919 Cone-Reproducer cone complete with voice coil - 6319 Capacitor -0.01 mfd.-Located on resistor board. Package of S 6321 Coil -2nd detector plate choke coil 8920Ring-Cone retaining ring 6322 Volume control complete with mounting nut 9416Coil-Reproducer field coil-Comprising coil, cone 6323Shaft-Tuning condenser drive shaft complete with one fiat washer and two C washers-Package of 2. housing and magnet 收音机爱 好者资料库 RadioFans.CN