RCA-Victor-Co-Inc-R-99 电路原理图.pdf

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1、PAGE 398-B MODEL R-99 High -Fidelity Electrola MODEL R-99 RADIOTRON COMPLEMENT (1) RCA -6L7Audio Volume Expander (2) RCA -6C5Audio Driver (3) RCA -2A3Power Output Audio Frequency POWER OUTPUT Undistorted.12 watts Maximum15 watts PICKUP TypeLow Impedance Magnetic Impedance100 ohms at 1,000 cycles 71,

2、0111 TOP BACK Of CHR5515 -Radiotron Locations Electrical Specifications (4) RCA -2A3Power Output (5) RCA -6C5Expander Amplifier (6) RCA -6H6Expander Rectifier (7) RCA -5Z3Full -Wave Rectifier Range Approximately 30 to 8,000 cycles LOUDSPEAKER TypeSuper 12 -inch Electrodynamic Impedance (V.0 )111/4 o

3、hms at 400 cycles PHONOGRAPH (MANUAL OPERATED) MotorSynchronous Type Speed (at rated frequency)78 r.p.m. POWER -SUPPLY RATINGS Voltage. .105-125 volts Frequency (two types) 50 or 60 cycles Power Consumption 180 watts MODEL R-99 (Second Production) The RCA Victor Model R-99 (second production)is iden

4、tical to the original model except for slight modifications. These modifications are as follows: new design of input trans- former T2, compensation pack, and volume control R4; RCA -6L7 audio volume expander tubegridresistor R5 changed in value from 330,000 -ohm to1meg.; a 56,000 - ohm resistor R24

5、is used in place of the former plate reactor L5; new design of interstage transformer T3; capacitors C12 and C13 have changed in value from 270 mmfd. to100 mmfd.; change in power cable; and a slight re -arrangement of parts. Model R-99 (second production) may be identified by reference to the assemb

6、ly wiring diagram figurewhere it may be seen that the input transformer T2 and the com- pensation pack are built in one unit (input pack) with cable connections to the pickup and to the volume control. In the original model the input transformer and the com- pensation pack were constructedas separat

7、e units witha cable connection between them. Model R-99 (second pro- duction) amplifier chassis may be identified by the 56,000 - ohm resistor R24 which is connected between the RCA -6C5 audio -driver tube plate terminal and an adjacent terminal board. Service data for Model R-99 (first production)

8、is directly applicable to the instrument except for the data contained herein. Cathode Current Reading-RCA-6C5 driver tube -2.8 ma. Voltage Measurements(Referring to figureService Data for Model R-99firstproduction)-Voltage valuesfrom diode plate P2 and the diode cathode C2 of the RCA, 6H6 Diode tub

9、e to chassis should be (7.3V.*), 0.35V; from plate P and from cathode C of the RCA -6C5 driver tube to chassis should be 145V. and 4.8V. respectively. BLACK BLACK OUTPUT TRANSF. T4 (no) FIELD I3804. LB BLACK BROWN BROWN BLACK BLACK -BROW N IA- 11141-0 -Loudspeaker Wiring Radiotron Cathode Current Re

10、adings Measured with Milliammeter Connected at Tube Socket Cathode Terminal under Conditions Similar to Those of Voltage Measurements (1)RCA-6L7-Expander7.6 ma. (2) RCA-6C5-Audio Driver4.4 ma. (3) RCA-2A3-Power Output41ma. (4) RCA-2A3-Power Output41ma. (5) RCA-6C5-Expander Amplifier1.9 ma. (6) RCA -

11、6H6 -Expander Rectifier0ma. (7) RCA-5Z3-Rectifier.165ma.* (* Cannot be measured at socket) 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 74.3. AC. POWER SUPPLY 01.7-711:-) TZ ; 12,000. I I L_ EXPANDER I CONTROL L 114 =M ED. 1000+ C3 2S to,opo. CI

12、S 1- .035 MFD. R 15)2rzooMED. 18 OUTPUT AL. .0.5MFD. R 330,0050 I vOLuME R4 1125,000. TOTAL. CS 20 MFIL EX PRNDER RECTIFIER 6H6 RIB 470,000. C20 0.5MFO. A4gY 100,000. C21 MFO. REACTOR RECT. 23 5Z3130MFD. PILOT LAMP USED ON SOME M00111 ONLV. DRIVER 6C CIO R MFO CII 0.25 MEIL,s. 3 1 O O C2 lc WO.1 C.1

13、5 .0025 CA2000. C I O.25 MF R1.1010 vOLU MK EXPANDER 6L7 C9 .05 MED. 22,000 31000. SPEAKER FRED RIO 560,0 -C8 IR MED. C25 IB MF D. 2200 RI1 5000. MOD EL R991ST PRODUCT ION -Schematic Circuit Diagram _1_04 D025 MID. R12 MEG. TONE CONTROL. f- 100,000. OUTPUT 3 T4 CUE -s DOS 01 MED.c. 54c - 2A3 OUTPUT

14、REACTOR RED 1.5 2000 REP eLUE- 3400 . BLUE- YELLOW - BLOC TRAN 5F WIRSTAGE TRAME PACK -RED - BLACK - 01A01- MTN -BLACK GREEN C, s- GREEN BROWN 120 .- MOWN- BLACK- BROWN YELLOW YELLOW 14.0E BLUE-YELLOW- BLUR POWER TRANSFORMER I I I t6 Ito 1. _Lc, III CAR. PACK 17L(19 -; REACTOR 收音机爱 好者资料库 RadioFans.C

15、N Er 44, 4. CI 2 60 194A M1 7 !LOA S 40n. 1 T2. 4 -71CUO n -MAIt .01 MFD.ft C29 2 7 C30 1 470C MMF. Ca oispAFD 005 1 MFD. o 4 NO 4000A. 1126 47,0004 0 DYNAMIC EXPM4DER CON71101. AC. POWER SUPPLY sT (,1=- FI _ _ _J AUDIO CSVOLUME ANN).EXPANDER C9 OS MFD R5 I MEG ,mum 20004 it 4 TOTAL 414 2MEG. RIE V

16、.(IMirmApa :1 6C5 Cali .035 MFD. R15 CIS 22000.5 MED. C6 E IPA MUER RECTIFIER 6H6 0 270 IIII IL F C20 RIB0.51A+0. 470,0004 O a a .2 0 DRIVER 6C5 76410211 r9 AfeWW. 100,0002000 1C2i 125 MFD. REACTOR 000 1604 C23 .316.3 30MFD. 119 22.000 -R7 Ra RIO 560000 -C13 leMFII. 10 LIFO. 33.000, 8185 IR 21 S000.

17、 :111.11: PILOT LAMP OUTPUT FIE. 10 MED.C25 R22 C2418M10.4500 SPEAKER FIELD (-Oa L.8 380 4 4-7 On tlI 0.25 MR_ T OI O R24 C MID. a 56,000A /(7 122 MIMED. TIESA. C IS 0.25 MI 7- ors MID C12 R12 +MEG TONE 02111110L CIS 100 MMF. R53 561000-A. SN-/11 -Schematic Circuit Diagram R-99 (2nd Prod.) R13 100,0

18、00. OUTPul 2A3 OUTPUT -YELLOW -68778 TARR 5F INTERSTAGE TRANSF PACK .13125 MED. T3 T4 O BLUE -YELLOve - - RED 1 119 -RED - BURR - BLACX-RED/R. -BLACK - - , 611201 GREEN ISIM01 120 MOWN-.- r MOWN - TEL1-11 YELLOW - SLY. BLOC -YELLOW-Ut- - POWER TRANSFORMER 4 REACTOR 收音机爱 好者资料库 RadioFans.CN PAGE 401-B

19、 R 99 ./tEXPANDER 17.3v. 6L7 , r 6.5v.i rA.C.-iq ; ro-fisi 95V. I9.7 V. I 248v. - J15.2v.*)226 IV. IV.O tt -61V. DRIVER 6C5 L_ 4V. 6.5V._pax. 1 Iii- DIODE 6H6 6.5V._ / - , CONTROL 0tuo AmPL. 6C5 110V. III 300v. 276v. L ELECTROLYTIC CAPACITORS 300v. r 325v. 1.25v.1.25v. Alc. 2.5v rA.c.1! OUTPUT I( A.

20、c.1I 2A3) OUTPUT (7.3V.*)-18v 0.35V. 2915 v. I I It -61V. 2A3 t -63v.*) -16v. 255v. i1 300V. 5.1v. RECT. 325v. 5Z3 370v.r A.C.370v. A.C. RESISTOR UNIT R22 BOTTOM FRONT OF CHASSIS P,111112.1 R991 ST PRODUCTION -Radiotron Socket Voltages Measured at 120 volts on 120 -volt tap, rated frequency-Volume c

21、ontrol minimum- Expander Dynamic control minimum-Dynamic amplifier adjusted asper text-No signal Note: Two voltage values are shown for some read- ings. The higher value shown in parenthesis with asterisk (*) indicates operating conditions without voltmeter load- ing. Dynamic Amplifier Adjustments I

22、tisessential that the correct voltages and currents exist at the RCA -6L7 audio expander stagein order that the expanding function may take place in the proper manner. A screw driver adjustment is accordingly provided to regu late the RCA -6L7 control grid No. 3 to the correct operating value. Two m

23、ethods of adjustment are applicable.Either method requires a normal voltage of 300 -voltsacross the filter output (resistor R22). The one to be preferred(a) requires the use of the RCA Stock No. 9633 Beat Frequency Oscillator or the equivalent, a 100 -ohm resistor, a 200 -ohm resistor,anda1,000 -ohm

24、 -per -volta -cvoltmeter(rectifier - type) having a low range of 1.0 volt and a high range of 250 volts or greater.The less accurate method (b)re quirestheuseofa RCA Stock No. 12353 SplitPlate Adapter,andasuitabled -cmilliammeter.CAUTION: Before using either method, be sure that power -supply fuse i

25、s in proper position for the line voltage. (a) Preferred Method.-Turn power switch(left front) off.Connect the200 -ohm andthe100,ohmresistorsin series between the beat -frequency oscillator terminals (upper 250 and CT) with the 100 -ohm resistor connected to CT. Calibrate the beat -frequency oscilla

26、tor,adjustitto 1,000 cycles and reduce its output. Connect the 1,000 -ohm per -volt a -c voltmeter (1 -volt range) to the beat -frequency oscillator terminals (upper 250 and CT). Remove the M plug from the F receptacle on the shielded cable running between the input pack and the volume control (seef

27、igure1).Connect beat -frequency oscillatorterminal CT to the shield on the M plug. Connect the junction of the 200 -ohm and the 100 -ohm resistors to the small pin (marked blue on diagram) on the M plug. Adjust beat -frequencyoscillatoroutputuntilthevolt- meter reads exactly1.0volt. Remove the voltm

28、eter leads from the beat -frequency oscillator terminals without disturb- ing any of the oscillator adjustments. Place the voltmeter to its 250 -volt or greater range and connect it between the plate prongs of the two RCA -2A3 power -output tubes. Con- nectionstothetube prongs may be made by strippi

29、ng R-99 (2114 proci.) Voltage 6C5 Driver Plate to chassis. 145 volts Cathode co chassis.4.8 volts approximatelyinch ofinsulation from the ends of two short leads of rubber -covered wire, wrapping one bare end around each plate prong (being careful not to allow the bare ends to short on the chassis w

30、hen the tubes are placed intheir sockets),and connectingthe voltmeter tothese leads. CAUTION: Do not touch these plate connections after the power isturned on since the potential at these pointsisrather high and carelessness might result ina serious shock. Set the expander Dynamic control (center fr

31、ont) to its extremecounter -clockwise position.Setthephonograph volume control (right front) to its extreme clockwise posi- tion. Turn on power switch(leftfront) and rotate this controltoitsextreme clockwise position,allowingitto remain inthisposition forall adjustments. Allow a few minutes for the

32、instrument to become stabilized. Adjust the expander bias control R20, on rear apron of amplifier (see figure 1), until the voltmeter reads 195 volts. Turn phono- graph volume control to extreme counter -clockwise position. Transfer lead from the junction of the 200 -ohm and the 100 -ohmresistorstot

33、hebeat -frequencyoscillator(upper 250)terminal without disturbing any oftheoscillator adjustments. Adjust phonograph volume control (right front) untilthevoltmeterreads50volts.Turntheexpander Dynamic control (center front)toits extreme clockwise position allowing maximum expansion totake place.The v

34、oltmeter should now read not less than 150 voltsifthe expander circuitisoperatingcorrectly.Failuretodoso indicates a defect in the system and the usual service pre- cedure should be followed. (b) Alternate Method.-Turn power switch(left front) off. Place RCA Stock No. 12353 Split Plate Adapter under

35、 the RCA -6L7. Connect a suitable dc milliammeter to the adapter. Turn both the phonograph volume control (right front) and the expander Dynamic control (center front) to their extreme counter -clockwise positions. Turn on power switch(left front) and allow a few minutes for the instru- ment tobecom

36、e stabilized.Adjust expander biascontrol R20, on rear apron of amplifier (see figure ),to give1.0 milliampere of plate current with no signal input tothe dynamic amplifier. (0 / RDJUST SCREW D SO THAT THE VERTKAL FORCE REQUIREDRDJUST RUTOMRTK SWITCH RS FOLLOWS:-WITII TO MRINTRIN RRM IN HORIZONTAL PO

37、SITION MEASURED , ,. . oworm 0 P .- Gwa 4.4/ wco fl, RT THESWITCH IN TRIPPED POSITION (OPEN ),RDJUST NEEDLE POINT WILL BE 57T5 GIUMS4OUNCE4).SWITCH SPRING .S. SO THAT THE DISTANCE URWEIGHT MEASURED WITH SCALE HOOKED UNDER NEEDLE SCREW BETWEEN CONTRCT POINTS IS AZ5.005. IO / 1 . 40(4.% NEEDLE -., LI.

38、9.W RVI, SCREW gigia .:. . *I MOTOR , . Vd MOTOR BOARD IS Le DEMON. t , . .-44, 3.0.4.maw. VIM CORM. NORM CORM TOW CONTROL 1 POWER P IRCRHm-UP_ .4 4k. ,:,.:- 1ff r -. (.f.2) , .-T.-,-.-.4.ir -. . , , 7 i . . 41.141 Istflio %It.1.(6) Km - N . sjitruwes : vki , .4.: 47 , -, SWITCH .-? e . Rae st-,cn T

39、RIP ROD RRTCHET i 14 SWITCH LEVER SWILL LARGE SPRING SPRING 11.0 IMAM e / il II if.Iler 1, ._ HOLE FOR NEEDLE CUP /.-W COUR PACK LiLIl4 also.eo.SOO. Vo46.44 i -NRUBBER t SPEAKER LOCK NUTCUSHION , V._ WITH RRM RT REST ON RUBBER CUSHION RDJUST TURNTABLE ,._.1 - SCREW AND LOCK NUT TO NEEDLE DIMENSICA S

40、HOWN. ro.r.e. ft. SWAM cmax TRIP ROD INSERT R VICTOR FULL TONE HOLE AND NEEDLE PROPERLY WARTED CLAMPING REMOW TURNTRDLE PIN IN MOW* NUT TO/ -I- MEDIUMHMV 0.1SPRING- _MOTOR CINNEININ 4It * SPRINGBOOR (110-_- LIGHT SPRIW - . ii. COMP PACK ADJUST TRIP ROO T/I CONINONNI TO THIS DIMENSION- -C. WASHER gee

41、 amc ore co.,. I ._CUP _ S-PIZP.: - WISHER /-4 . T-7.3441- MOTOR-. _BOTTOM CI BOARDSPRING,- nisi I I.- -., SUPPORTCUP CR,. ED -._. WASHER I _,_-.14.7. IE WINDER SIRS CONTROL Ft20 . PI LOT -1 LAMP 1.7 . *-T) SECTION TURN COVER TO DO NOT DISTURB PERMIT OILING A II THESE ADJUSTMENTS (USE LIGHT MACHINE

42、OIL) R99 1ST PRODUCTION Assembly Wiriirg-Motor Board Adjustments PAGE 403-B R 99 Insist on genuine STOCK No. 11350 12110 12488 5107 4838 5196 4886 4518 5170 4840 11240 12472 5212 11496 12470 12467 12465 11272 5240 12468 10907 5239 12471 12466 12206 12195 12469 11298 MODEL R-99 WEAR MD DISTORTING The

43、 output transformar aowntod on the loudspeaker unit shouldbe impacted in all eases of paneling trouble on the R-99, to am that St la not sagged and touching against the top of one of the filter lootrolytio capacitors.If this oondition ha developed, the speaker field and bias of the output stage may

44、be shorted out. Rend the transformer mounting bracket so that there is ample ear* ofOK TWIN REPLACEMENT PARTS factory tested parts, which are readily identified andma be urchased from authorized dealers. DESCRIPTION AMPLIFIER ASSEMBLIES R 99 1ST PRODUCTION Cap-Grid contact cap-Package of 5 Cap-Top s

45、hield cap for 6L7 Radiotron Capacitor -270 Mmfd. (C12, C13) Capacitor-.0025 Mfd. (C14, C26) Capacitor-.005 Mfd. (C16, C17) Capaitor-.035 Mfd. (C19) Capacitor-.05 Mfd. (C9) Capacitor-.05 Mfd. (C5) Capacitor-.25 Mfd. (C11) Capacitor-.25 Mfd. (C15, C21) Capacitor -10 Mfd. (C24). Capacitor -10 Mfd. (C10

46、). Capacitor -18 Mfd. (C8, C22) Capacitor -18 Mfd. (C25). Capacitor -20 Mfd. (C6). Capacitor -30 Mfd. (C23). Capacitor-Capacitor pack, comprising3 sections, each 0.5 Mfd. (C7, C18, C20) Clamp-Volume control or speaker cable clamp Cover-Fuse cover. Expander-Control (R20) Fuse -3 -ampere fuse (F1)-Pac

47、kage of 5. Mounting-Fuse mounting Plate -6L7 socket mounting plate assem- bly, less socket Reactor-Filter reactor (L7) Resistor -270 ohms,insulated, 1/4watt (R6)-Package of 5 Resistor -2,200 ohms, insulated,1/4watt (R11, R15)-Package of 5 Resistor -4,600 ohms, wire wound (R22) Resistor -5,600 ohms,

48、carbon type, 1 watt (R21) LIST STOCK No. 11332 12487 12286 12263 12452 12285 12486 4794 11197 11198 12464 12463 12511 12110 5107 4838 5198 4888 4518 5170 12484 12741 11203 12472 DESCRIPTION Resistor -22,000 ohms,carbontype,1 watt (R9)-Package of5 Resistor -33,000 ohms,carbontype,2 watt (R8). Resisto

49、r -56,000 ohms, insulated, 1/4 watt (R23)-Package of 5 Resistor -100,000ohms,insulated, 1/4 watt (R13, R16, R17, R19)-Package of5. Resistor -330,000ohms,insulated, 1/4 watt (R5)-Package of 5 Resistor -470,000ohms,insulated, 1/4 watt (R18)-Package of 5 Resistor -560,000ohms,insulated, 1 watt (R7, R10)-Package of 5 Socket -4 -contact 5Z3 or 2A3 Radiotron socket Socket -6 contact 6C5 Radiotron socket Socket-7.contact 6116 or 6L7 Radiotron socket Trans