Stewart-Warner-Corp-9009-B 电路原理图.pdf

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1、6SG7 6SF7 6SJ7 6V6GT 1st BET. I.F. 2nd BET.A.V.C. 1st.F. OUTFIT MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS STEWART-WARNER MODEL 9009-B Remove chassis and loop antenna (cabinet back) irom cabinet. Reconnect loop to chassis and spa

2、ce it approximately same distance from chassis as when installed in cabinet. With the gang condenser fully meshed, the dial pointer should be in the position indicated by the last mark below 55 on the dial. If it is set incorrectly, release the pointer clip on the dial cord and reposition pointer. C

3、onnect an output meter across the speaker voice coil or from the plate of the 6V6GT tube to chassis through a .1 Mfd. condenser. Connect the ground lead of signal generator to the receiver chassis. Set volume control at maximum volume position and nse a weak signal from the signal generator. DUMMY A

4、NT. IN SERIES WITH SIGNAL GENERATOR CONNECT HIGH SIDE OF SIG. GENERATOR TO SIGNAL GENERATOR FREQUENCY RECEIVER DIAL SETTING TRIMMER NUMBER TRIMMER DESCRIPTION TYPE OF ADJUSTMENT .1 MFD. Trimmer on top 455 EC Any point where it 1-2 2nd I.F. Adjust for maximum output. Then repeat adjustment. Condenser

5、 section of gang. does not affect the signal 3-4 1st I.F. 200 MMFD. Mica Condenser External Antenna Clip on Loop Antenna 1500 KC 1500 KC 5 Broadcast Oscillator Adjust for maximum output. 200 MMFD. Mica Condenser External Antenna Clip on Loop Antenna 1500 KC Tune to 1500 KC generator signal 6 Broadca

6、st Antenna Adjust for maximum output. APPROXIMATE STAGE GAIN DATA Be sure R.F. and I.F. stages are accurately aligned before 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

7、measurements. Observe following precautions: 1. For all gain measurements 2. For R.F. and I.F. measurements connect connect signal generator as negative terminal of a 13 volt battery (two shown iTee firm V C sinnol IV2 volt cells in series) to A.V.C. lead and ?1r ,nn 1 K J 1 positive terminal to Cha

8、ssis. This provides a with 400 cycle modulation definite operating point. (use nearby frequency if IMPORTANT: Disconnect battery when local station interferes.) measuring, audio stprge gains. 3. Be sure radio is carefully tuned to generator signal (use weak signal for sharp tuning.) 4. When using a

9、chan nel type instrument carefully tune it for maximum output at desired frequency be fore making measure ments. The R.F. and I.F. stage gains shown below are less than under normal operating conditions due to the use of 3 volts fixed bias in order to establish a definite operating point. Therefore,

10、 these values are not intended to indicate the full capability of a stage. *_I50X_- AT 455 KC. tan triin.-iu Differences m tube characteristics, tolerance of parts, adjustment of tuned circuits, and variations of line voltage will influence stage gain Accuracy of measurements is dependent upon caref

11、ul tuning of receiver to generator signal and experience in using your test equipment These factors may create considerable variation in gain measurements. The audio system of this receiver utilizes a two stage type of inverse feed-back arrange ment and should it ever be necessary to replace the spe

12、aker or output transformer it is important to maintain a definite phase relationship in the feed-back circuit. If the con nections to the output transformer are reversed or if the feed-back connection is made to the wrong side of the output transformer secondary, the system will become regenera tive

13、 instead of degenerative. Under those conditions audio oscillation may result. If that occurs, oscillation may be prevented by reversing the connections to the primary of the output transformer. IMPORTANCE OF MAINTAINING FIXED POSITIONS FOR LEADS AT TOP OF CHASSIS The shielded leads which are routed

14、 to the Radio-Phono switch and volume control should be tied to the upright bracket which supports the dial assembly. Grounded shields on these leads must not be allowed to contact electrolytic condenser case. If case of condenser is grounded it will short out bias voltage for 6V6GT tube. I 23E dHJE

15、 = ANT. H 1500 KC. 146 a JO. wD THIS TRIMMER GEN ERALI* OOES NOT REQUIRE ADJUST MENT. IT IS WIREO IN PARALLEL WITH TRIMMER NUMBER*. osc. 1500 KC. DIAL AND POINTER DRIVE CORD ARRANGEMENT Top view Dial plate removed To string dial cord, set gang condenser to fully meshed position 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