RCA-Victor-Co-Inc-94BP 电路原理图.pdf

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1、582 MODEL 94BP SERIES Chassis No. RC -407 RC -407B Four -Tube, Single -Band, Battery -Operated, Superheterodyne Receiver The following models comprise the 9411P1 Series- all contain the No, RC -407 chassis. 94BP61 Dark Brown 94BP62 Tan 94BP84 Light Brown 94BP66 Gray 94BP80 Brown Leather 94BP81 Black

2、 Leather The following models comprise the 2nd Production 94BP1 Series -all contain the No. RC 4078 chassis. 94BP61 Dark Brown 94BP62 Tan 94BP64 Light Brown 94BP66 Gray Electrical and Mechanical Specifications RC 407 Frequency Range Intermediate Frequency 550-1,720 kc 455 kc RCA TUBE COMPLEMENT (1)

3、RCA- IA7-G 1st-Det.-Osc. (2) RCA -1N5 -G (3) RCA -1H5 -G 2nd-Det., A- (4) RCA -105-G BATTERIES REQUIRED A, one 1.5 volt dry plug -type A, 2 -in. x (Eveready No. 742 or equivalent) B, two 45 volt dry plug -type B, 2* -in. x (Eveready No. 762 or equivalent) CURRENT CONSUMPTION A, 0.24 ampere-B, 9.0 mi

4、lliamperes Frequency Range Intermediate Frequency RCA TUBE (OMPt.EMENT F, and A.V.C. I -F Amplifier Output 21 -in. x 4 -in. 4 -in. x 51 -in. POWER OUTPUT Undistorted Maximum 0.10 watt 0.21 watt LOUDSPEAKER Type 4 -inch permanent -magnet dynamic Voice -coil Impedance 2 ohms at 400 cycles Height Width

5、 Depth Cabinet Dimensions (inches) 9 12* 611 Weight-(Net) less batteries 6 pounds With batteries 12 pounds Tuning Drive Ratio 10 to 1 Electrical and Mechanical Specifications 530-1,650 kc POWER OUTPUT 455 kc 1ndistorted 0.12 watt (1) RCA -1A7 -G (2) RCA -1N5 -G (3) RCA-IHS-G (4) RCA-IQS-GT Ist-net.-

6、Osc. I -F Amplifier 2nd-Det., A -F, and A.(. Output 1st -Production, RC -407: The following notes apply only to the 1st. production of Models 94BP1 Series (94BP-81, 62,-84,66,80,-81). Antenna Attachment: Due to the extended service that -the 94BP1 Series radio has been put to use by many of its owne

7、rs-such as service on small boats, camping trips, and other uses in locations far distant from a reliable broadcasting source -there have been requests for information on the use of an antenna to be used in conjunction with the receiver. The radio is one of high sensitivity, but where few stations a

8、re receivable, two method, of using an external antenna may be used: (a) Five to ten turns -of wire may be wrapped around the left end (loop end) of the cab- inet attaching one end of the wire to a high antenna and the other to ground. (b) One to two turns of insulated wire spay b wrapped around one

9、 end of the loop in the cabinet, making connections to the end of an external antenna and ground. The wire may be fastened to the loop supports with scotch tape or string and the ends brought out through the rear -of the cabinet making a permanent attachment for an outside an- tenna. If care is take

10、n in placing the wire around the loop (using small 22 gauge D.C.C. wire spaced as far as possible from the loop winding) the receiver will not have to be realigned and the directional effect of the loop will not be so prevalent. Oscillator Grid Resistor in 1st -Production: The oscillator grid resist

11、or is changed from 220,000 ohms to 150,000 ohms (Stock No. 14020). RC 407E3 Maximum. 0.25 watt CURRENT CONSUMPTION A, 0.24 ampere-B, 11.6 Volume Control Change in 1st -Production: The volume control is changed from Stock No.33304 to 34427. Additional Replacement Parts: Stock No. 34426 Indicator-On-o

12、ff indicator :12571 Knob-Tan volume control or tuning knob for 94BP-61,-80, and tuning knob for 94BP-84 33309 Knob-Tan Volume control knob, 94BP-64 Circuit Modifications: Circuit modifications as explained and illus- trated below have been effected on the 1st - production (RC -4071 Model 94BP1 Serie

13、s, battery -operated portable receivers. These changes are incorporated on the bulk of production. Wherever it is necessary to service an instru- ment not having the revised circuit, it is recom- mended that the changes shown be made. ADD CMANee e20 33,000. 7e 300a CHANGE 300 MMF ro 100 WAIF VOLUME

14、CONTROL CHANGE .0015 MIO. TO 400 GRANGE 150 MM. TO loo *r CNA se 00ta MID. TO 400 IMF. cannes .0t An To 1000 Mn,. Circuit Revisions in 1st Productions Model 94BP1 Series (RC -407). milliamperes MATERIAL REQUIRED: Quantity 2 3 1 1 Part RCA Stock No. Capacitor -400 mmf Capacitor -100 mmf Capacitor -1,

15、000 mmf Resistor -390 ohm Resistor -33,000 ohm PROCEDURE: (a) (b) (c) (d) (e) (f) (g) (h) 13894 12720 12885 80498 30685 Change 820 ohm bias resistor of 1C6G stage to 890 ohms. Change plate coupling ,.dpacitor from .0025 to 400 mmfd. Change 1H5G plate by-pass from 260 mmfd to 100 mmfd. Change 800 mmf

16、d of 2nd I -F secondary by-pass to 100 mmfd. Change .0025 mfd of volume Control arm circuit to 400 mmfd. Change 1C5G plate by-pass from .01 mfd to .001 mfd. Add 88,000 ohm resistor in series with high end of volume control. By-pass high end of volume control to chassis with 100 mmfd, Loudspeakers: T

17、hree types of loudspeakers have peen em- ployed in Models BT -40 and 94BP1. Though of different design and using non -interchange- able cones, unfortunately, two of these speakers were identically marked. As a consequence, there has been considerable misunderstanding in ordering and in filling order

18、s for replacement cones, with resultant delay. In order to prevent delays in the filling of future orders, the complete speakers only will be stocked. This may be ordered by Stock Number 33058. 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 1- 583-

19、C 91BP I SERIES LOOP LOO TUBE Loor 220,00 A- 1 A7G 1ST DET. TRANS. o? 2 m GREEN 1 21 C2 31oI bnt _ n , 1N5G I.F. AMPL. 05 _ I - 1 T 60 68,0o Y V 1.-I5G 2N W i82v. i 82V. 2No I.F. TRANS. III III.GREEN F C3 +1.4V. .r+1.4V. =50 14 014 C4 1.1 _L1 MEG. O w O 0 C5 T Tn C3n 3 .00t5 2.2MEG. / 5O0,00 VOLUME

20、CONTROL 10 MEG 0025 1C5G OUTPUT s8OV. GREEN e O SC. COIL LOCATION C2 m o C1 435 HC TRANS._ 2 GREEN . r C7 05_ MER= I C!o R21 n - 68,000 MMF O tJ 4 +1.4V. m* 62v. 82V. 2ND.I.F. 8MFD1- FIL. -A +A -H WHITE BROWN YELLOW 1.5 V. 8tO 1H5G 1Q5GT 2N DET.,A.F. $A.V.C. OUTPUT i TRANS. IIk.,GREEN CIO E Io b R4

21、4/000a. o C4 T 455 KC = OSC.COIL NS6 /lA G ANT. 15001cc 0 3 10 MEG. R5 VOLUME. CONTROL 3 1 MEG. (00 +1.4V. 63 V. R7 MEG R/o to MEG O o C18 C20 O.I - MFD. Chassis No. RC 4078 400 MME 8MFD=- j:111F- -A WHITE FIL. +A BROWN 1.5V. 420n. On some Mod. ;s 1 C5G Plate Condenser i, .005 mid. VOLTAGE DROP ACRO

22、SS RESISTOR 7.5V. / PPST SWITCH 1,-ON VOL. CONTROL +B RED 90y. 1.4v. + -B YELLOW i80V. -GREEN R9 O ., I I l J 42on VOLTAGES SHOULD 1401.0 *207. WITH RATED BATTERY VOLTAGE. I MEASURED WITH CHANALYST OR VOLTOHMYST VOLTAGE DROP ACROSS RESISTOR 6v PPST SWITCH -ON VOL. CONTROL +H RED 901/. TUDE LOCATION &TRIMMER ADJ. POSITIONS 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN