Packard-Bell-Co-471 电路原理图.pdf

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1、MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS /D /A a* SERVICE BULLETIN MODEL 471 (/fon4l4(CUffeljt PORTABLBECEIVEB ALIGNMENT CHART TUBE VOLTAGE CHART NOTE: VOLTAGES TAKEN FROM B WITH V.T.V.M.NO SIGNAL STAGE GAIN MEASUREMENTS Standard Output . 50 mw Dummy Antenna . .01 mfd. Volume Control . . . Ma

2、ximum Converter grid to 1st I.F. grid . 51 X at 1000 KC Converter grid to 1st I.F. grid . 65 X at 455 KC 1st I.F. grid to 2nd detector . 55 X at 455 KC Overall audio gain.014V at 1S6 grid 100 mw output 400 cycles D.C. Resistance Measurements 4 11 Standard 600 KC 600 KC _Test Loop_ 5 Repeat Step No.

3、3 NOTE: Hazeltine Test Loop No. 1150 or equivalent. 1ST l,f R n_ 2ND IF 1st I.F. Coil Oscillator Coil Primary . . . . 20 ohms Primary . Secondary . . . 20 ohms Secondary 2nd I.F. Coil Primary . . . . . 15 ohms Secondary . . . 15 ohms i IR5* j i IT4* TRIMMER LOCATIONS 3V4* CHASSIS GROUND 0- GROUND 2 DRY RECTIFIER BATT.oQA-C. -ihJ C 100 6V l1| EVEREAOY 7-5 l 754 PACK I V I | OR EQUIV. VlraWS-3 REAR VIEW OF SWITCH * SUPPRESSOR GRIDS TIED INTERNALLY AND NOT SHOWN IN SCHEMATIC 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN