RCA-Victor-Co-Inc-T4-9A 电路原理图.pdf

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1、PAGE i7 -B MODELS T 4-8A and T 4-9A These instruments are similar to Models T 4.8 and T 4.9 except for several circuit modifications. The major differences include: -rearrangement of wave -trap circuit, removal ofoscillator low frequency trimmer, replacement of the RCA -6F7 with an RCA -6B7, and ref

2、lexing of the i-f stage for additional audio amplification. The intermediate frequency remains at 460 kc. The antenna and oscillator coils are to be aligned onlyat 1400 kc.Refer to T 4.8 and T 4-9. Service Notes for loudspeaker data, power ratings and specifications. DIAL CALIBRATION: With tuning co

3、ndenser fully meshed,check dial calibration. STEP CONNECT HIGH SIDE OF TEST OSC. TO - TUNE TEST OSC TO - TURN RADIO DIAL TO ADJUST TEE FOLLOWING FOR MAX- OUTPUT 1 1st De t . Grid in series with 0.01 mfd 460 kc Quiet Point near 800 kc C12, C11 1st I -F Trans. 2 Antenna in series with 200 mmfd C27Wave

4、 Trap Minimum Output 3 1400 RC1400 kcC25, C24 Osc. Ant. Na 4 tf. ev. Ti RATE IlAr-A. mum - POWER TRANSF. CI9DET. & OSC. I1 800-CI6A7 8 130018-405 MMF MMF L1L2 CA C4 .05 MED 5-40 MMF 300 SECTION R7z TAt v C. E. POWER TRANSF C5 5-40 MMF IMMF 56,0004 3 )L4 5, 54.C6 18-205 MIME -C. 170 MMF L6 ./.L.,.5 (

5、1:4 CS CV4147F 1f5.=18 I. MEG. WAAA CAN NOT St INCADVE wiNi ORDINARY METER A / IsT.DET.&OSC. I.F. &MT. 6 B7 Ga 175= MAW 220,000, 94 547, 144044. GANG 402* aK 1400 K.C. CI .4 14.40411 004. 4404 CsCS1TIMI144 P NOE SOCKET VOLTAGES IS Va., A -C L.4 -PAANANAACC NowN. C-2 -C-5 OSC. / I -P TRANS. 667 I. F

6、4. 240.0E7 175 MMF CI R5 33.000479,000 .0025 Cizo MFD goo,13 MMF R7 56 MEG I OUTPUTRECTIFIER OUTPUT 41 ,450 AAA J .005 MFO C14 C-4 is .01 Mfd. inSome Instruments. T 13.1- 110V- 60,v 110V- 25, SI RECT FIER IV 222A 160 C S00, /O.110V. 25., 4 io CIFs318. L10 41.0 FIELD- 8 Am 1800,-mr, Cos R9 18000A 100

7、25 44417 Cr7 ST TO ALL FILAMENTS MED. Schematic Circuit Diagram T 4-8A andT4-9A R10 470,000-, v5VVW Po LAI L9 LOUDSPEAKER -WPM de, 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 18-B T4-8 A & 4-9A A ELECT. CAP. 4,t f4: 41. 7ws t. AO YELLOW OO

8、DWP TGREEN SWA 2 AMA aus-0 OZ WiS YELLOW-may Rt MEOW -C., 13.t11LIk BROW* Chassis Wiring TXRED REPLACEMENT PARTS Srocc No. DESCRIPTION STOCK NO. DESCRIPTION Receiver Assemblies 11668Resistor -5.6 Megohms-carbon type-t/4 watt (R7)-Package of 5 4244Cap-Grid contact cap-Package of 5. 11126Shield-Oscill

9、ator coilshield 6956Cap-Seconddetector Radiotronshield 3942Shield-Second detector Radiotron shield. cap 11390Shield-First intermediate frequency trans, 4246Capacitor -80 mmfd. (C3) former shield 3116Capacitor -175 mmfd. (C10) 4340Lamp-Dial lamp-Package of 5 11500Capacitor -175 mmfd. (C11) 5152Transf

10、ormer-First intermediate frequency 3784 Capacitor -900 mmfd. (C12) transformer (L5, L6, C8, C9) 5107 Capacitor-.0025 mfd, (C13, C17) 7955Transformer-Secondintermediate fre, 4868Capacitor-.005 mfd. (C14) quency transformer (L7, L8) 4836Capacitor-.05 mfd. (C4) 11665Transformer-Powertransformer -105. 4

11、841Capacitor -0.1 mfd. (C18) 125 volts 25.50 cycles 11497 Capacitor -8 mfd. (C16) 11666Transformer-Powertransformer -100- 11240 Capacitor -10 mfd. (C15) 130/140.160/195,250 volts 40.60 cycles 11661 Coil-Antenna coil (LI, L2) 11664Transformer-Powertransformer -105. 11662 Coil-Oscillator coil (L3, L4)

12、 125 volts 50.60 cycles -(T1) 11660Condenser-Two gangvariabletuning 11667Trap-Wave trap(L11, C19) condenser (C1, C2, C5, C6) 11663Volume control (R2, Si) 11659Dial-Station selector dial 11670 Resistor -330ohms-carbontype -1 watt (R8)-Package of 5 11671Resistor -18,000 ohms-carbontype -2 watts (R9) R

13、eproducer Assemblies 11669Resistor -33,000 ohms-carbon type -1 watt (R5)-Package of5 11672Coil-Fieldcoil,magnet and cone sup, port assembly (L10) 5029 Resistor -56,000 ohms -carbon type -1/4 watt (R1)-Package of 5 9588Cone-Reproducer cone(L9)-Package of 5 5158 Resistor -220,000 ohms-carbon type -1/4

14、 watt (R4)-Package of 5 5119Connector-Three-contactfemalecon - nector for reproducer cable 11172 Resistor -470,000 ohms-carbon type_1/4 watt (R6, R10)-Package of5 5118Connector-Three,contact male connector for reproducer 3033Resistor -1 Megohm-carbontype -1/4 9630Reproducer-Complete watt (R3)-Package of 54893Transformer-Output transformer (T2) . 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN