Stewart-Warner-Corp-9005-B 电路原理图.pdf

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1、MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS C9 C9 in C9 in C9 bg |o| .f-, goa COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 141 -Measured with vacuum tube voltmeter 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS STEWART-WARNER MODELS 9005-A, B. When gang condenser is fully m

2、eshed, dial pointer should be in the position indicated by the 54 mark on the dial. If it is set incorrectly, release the pointer clip on the dial cord and reposition pointer. Connect an output meter across speaker voice coil or from the plate of the 1A5GT tube to chassis through a 0.1 Mid. condense

3、r. Connect the ground lead of the signal generator to the receiver ground lead (black) or to the chassis. Set volume control to maximum volume position and use a weak signal from the signal generator. DUMMY ANT. IN SERIES WITH SIGNAL GENERATOR CONNECT HIGH SIDE OF SIG. GENERATOR TO SIGNAL GENERATOR

4、FREQUENCY RECEIVER DIAL SETTING TRIMMER NUMBER TRIMMER DESCRIPTION TYPE OF ADJUSTMENT .1 MFD. Condenser Grid cap on 1A7GT tube 455 KC Any point where it doei not ailect the signal 1-2 2nd I.F. Adjust lor maximum output. Then repeat adjustment. mgm 1st I.F. 200 MMFD. Mica Condenser External antenna l

5、ead (blue) 1500 KC 1500 KC 5 Broadcast Oscillator Adjust for maximum output. 200 MMFD. Mica Condenser External antenna lead (blue) 1500 KC Tune to 1500 KC generator signal 6 Broadcast Antenna Adjust for maximum output. APPROXIMATE STAGE GAIN DATA Be sure R.F, and I.F. stages are accurately aligned b

6、efore measuring gain. R.F. gains can be measured with a “channel type instrument containing a tuned and calibrated R.F. amplifier. A vacuum tube voltmeter may be used for audio gain measurements. Observe following precautions. 1. For all gain measurements 2. For R.F. and I.F. measurements 3. Be sure

7、 radio is 4. When using a “channel” connect signal generator as connect negative terminal of a U/j- carefully tuned type instrument carefully shown. Use 600 KC signal volt battery to A.V.C. lead and posi- to generator sig- tune it for maximum out- with 400 cycles modulation tive terminal to chassis.

8、 This pro- nal (use weak put at desired frequency (use nearby frequency if vides a definite operating point. signal for sharp before making measure- local station interferes.) tuning.) ments. The R.F. and I F. stage gains shown below are less than under normal operating conditions due to the use of

9、lVfe volts fixed bias in order to establish a definite operating point. Therefore, these values are not intended to indicate the full capability of a stage. Differences in tube characteristics, tolerance of parts, adjustment of tuned circuits, and variations of line voltage will influence stage gain

10、. Accuracy of measurements is dependent upon careful tuning of receiver to generator signal and experience in using your test equipment. These factors may create considerable variation in gain measurements. DIAL AND POINTER DRIVE CORD ARRANGEMENT To string dial cord, set gang condenser to fully mesh

11、ed position and use following parts: Clip on end of cord Cord (36 inches) Ring for dial cord Tension Spring 114955 117057 119087 114968 POWER LINE OPERATION The following power pack may be used to operate this set on 110 volt 50-60 cycle A.C. power lines. Porta-Power Model “H This unit is manufactured by the General Transformer Corp., 1250 W. Van Buren St., Chicago, Ill. COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN