Stewart-Warner-Corp-61T16 电路原理图.pdf

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1、MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS STEWART-WARNER MODELS 61T16 AND 61T26 -Measured with vacuum tube voltmeter 161384 Tension Spring 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS STEWART-WARNER MODELS 61T16 AND 61T26 The R.F. and I.F. stage gains shown below are less

2、than under normal operating conditions due to the use of 3 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. Ill Dft 75X 20X m ATiiKC. 9 *r oo octet 1ISFT user liigfl 9 nmr Differences in tube chara

3、cteristics, tolerance of parts, adjustment of tuned circuits, and variations of line voltage will influence stage gain. 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 variati

4、on in gain measurements. ALIGNMENT PROCEDURE connection (see voltage chart on op- lead should extend from under the Remove chassis and loop from cabinet. Solder approximately 8 of insulated wire to any B- posite side for convenient B location). Then reinstall chassis and loop in cabinet. The B chass

5、is at the back. Connect ground lead of signal generator to B lead. Connect output meter across the speaker voice coil (terminals at back ot speaker.) Turn the tuning control knob clockwise as far as it will go (tuner mechanism is now in maximum open position with tuning slugs almost completely withd

6、rawn from coils). Dial pointer should then point to 1600 Kc mark on scale. If it is set incorrectly, release pointer clip on dial cord and reposition pointer. DUMMY ANT. IN SERIES WITH SIGNAL GENERATOR CONNECT HIGH SIDE OF GENERATOR TO SIGNAL GENERATOR FREQUENCY RECEIVER DIAL SETTING TRIMMER NUMBER

7、TRIMMER DESCRIPTION TYPE OF ADJUSTMENT Set tuner mechanism to maximum open position by turning the tuning control knob clockwise as far as it will go (Dial pointer at 1600 Kc). Then check whether the positions of the tuning slugs correspond to the positions shown in Fig. I below. If settings are inc

8、orrect, rotate the individual core and threaded stem until desired position is reached. Nets that threaded stem is prevented from moving by a dab of speaker cement at top. .1 MFD. Condenser Ungrounded term inal of trimmer No. 6 (see Fig. 2 below for location of trimmer.) 455 KC Any point where it do

9、es not affect the signal. 1-2 2nd I.F. Adjust for maximum output. Then repeat adjustment. 3-4 1st I.F. 300 MMFD. Mica Condenser External Antenna Clip on Loop Frame 1600 KC 1600 KC 5 Broadcast Oscillator (Shunt) Adjust for maximum output. 300 MMFD. Mica Condenser External Antenna Clip on Loop Frame 1

10、600 KC Tune to 1600 KC generator signal 6 Broadcast R.F. Adjust for maximum output. 7 Broadcast Antenna Adjust for maximum output. 300 MMFD. Mica Condenser External Antenna Clip on Loop Frame 1400 KC Tune to 1400 KC generator signal Ant. coil tuning slug Adjust position of slug for maximum output. R

11、.F. coil tuning slug Adjust position of slug for maximum output. 300 MMFD. Mica Condenser External Antenna Clip on Loop Frame 1600 KC Tune to 1600 KC generator signal 6 Broadcast R.F. Recheck adjustment for maxi- mtim output. 7 Broadcast Antenna Recheck adjustment for maxi- 1 mum output. nTOP VIEW O

12、F CHASSIS n =3_Jl_LL qS“o ANT. OSC. R.F. 1600KC I6C0KC 1600KC 136 AUDIO OSCILLATION FIG. 1 SLUG TUNER ASSEMBLY (Drive Parts) 117057 Cord (8 114955 Clip on 504012 Spring QPQA, FIG. 2 _i _ n-4 COIL COIL B COMPILED BY M. N. BEITMAN. SUPREME PUBLICATIONS The audio system of this receiver utilizes a two

13、stage type of inverse feed-back arrangement and. should it ever be necessary to replace the *“ speaker or output transformer, it is important to maintain a definite phase relationship in the feed-back circuit. If the connections to the out put transformer are reversed or if the feed-back connection

14、is made to the wrong side of the output trans- ) former secondary, the system will cord become regenerative instead of de generative. Under those conditions audio oscillation may result. If that occurs, oscillation may be prevented by reversing the connections to the secondary of the output transformer. 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN