Howard-Radio-Co-906-S 电路原理图.pdf

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1、TONE CONTROL nmnrrr JUUUUUL 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS 9 i s i “if T 3 i uiw m iiiss iiHiisg: ,-2rfx*222 -2Z -z * ozwo Ik wzSzz Eo tsiea S * * S o S1 1| Trrrrr Oo sis K K Os zz HHfr Oi OS $ ? 8, z o t- 10 o o J Oi 0 3 - 10 n o 6SA7 75 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1948 MOST-OFTEN-NEED

2、ED RADIO DIAGRAMS Howard Radio Company. Model 906-S. See page 75 for Schematic. Voltage reading taken from ground with voltage at line set at 117 volts A.C. These readings were taken with a vacuum tube voltmeter of the VoltOhmyst Junior type. TUBE FUNCTION CATH. * SC. * PLATE * B * 6SG7 R.F. 7.2 5 3

3、 200. 6 210. 8 6SA7 Convertor . . . . -10. 85. 5 4 225. 3 6SK7 1st. I.F. 3. 5 90. 6 230. 8 6SQ7 Det. & 1st. Audio. 110. 6 6V6 Output. 13. 8 230. 4 280. 3 5Y3 Rectifier . , . . 290. 8 Voltage drop across filter choke 10 volts * Socket Terminal Number. DUMMY ANTENNA SIG. GEN. CONNECTION GEN, FREQ, BAN

4、D POSITION DIAL SETTING ORDER OF TRIMMER ADJUSTMENTS TRIMMER FUNCTION SEE NOTE 1 .05 Mfd. Grid of 6SA7 455 KC BC Off Station D I.F. Peak to Maximum A 2 .05 Mfd. Ant. 455 KC BC Off Station Null B 3 400 Ohm. Line A Ant. Post 600 KC BC 600 KC Maximum C 4 400 Ohm. Line A Ant. Post 1400 KC BC 1400 KC BC

5、Osc. and R.F. D 5 Repeat operations 3 and 4 E 6 400 Ohm. Line A Ant. Post. 6 MC A 6 MC 05) Maximum F 7 400 Ohm. Line A Ant. Post 20 Ml B 20 MC 03)02) Maximum G 8 Accurately set signal generator at one Ml and check-through both short wave dials, harmonics to be one MC apart. NOTE A. The I.F. adjustme

6、nts are iron core slug tuning and it should not be necessary to move them very far in either direction from the factory setting, since they are of a very stable nature. NOTE B. Important. Connect the signal generator to the antenna screw on the outside of the radio chassis and keep the metal of the

7、chassis between the generator lead and the wave trap coil. Use your signal generator to the desired turned up powerful position and ad just the wave trap trimmer to null. NOTE C. Padding condenser adjustment for calibration at low frequency end of broad cast band. NOTE D. Set dial at 1400 KC. Adjust oscillator and R.F. trimmer for maximum sensitivity. NOTE E. Check broadcast stations across dial for accuracy. 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN