Howard-Radio-Co-300 电路原理图.pdf

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1、MANUAL OF 1940 MOST POPULAR SERVICE DIAGRAMS GAB 6.T 6SK7 GQ76 r 6K6GT TUBE FUNCTION Mb PLATE Mixer 4.5 105 % 6SC7 I? 4*5 105 195 Det. X X 60 Output 15 185 l/S f u TOP VIEW PWR TRANS liV Z7-130 HSV-iO -/f-938 HSK 230K - 40-*P Howard Radio TJTndel 300 Wave-Band Switch Posi tion Positi on of Dial Poin

2、ter Generator frequency Generator Connection See Note Trimmers Adjusted (In order shown) Trimmer Function X Min. Cap. 465 KO 6A8 Grid A.E *1 H *3 X* I? X 1400 KC 1400 KC Brown lead D 5 *5 Osc. k Ant. X 600 KC 600 KC Brown lead OUT PLATE OSC. SECTla( 1 A* 3aoh-.step of the alignment should be repeate

3、d in the original order for greater acouracy. Keep output from signal Generator low. The I.F. trlmiMrs are reached through the two holes on the top of each I.F. can. B- When aligning the short wave bands, do not adjust to the IMAGE fre quency. For example, if the adjustment is correctly made at 21 M

4、C, then a weaker image will be heard at 21,000 KO less 930 KC, or about 20,070 KC on the dial. C- When adjusting this pad, more the tuning hand back and forth and ad just padder until the peak of greatest Intensity is obtained. D- See that the tuning hand is set exactly on the last line abore 540 wh

5、en the condenser is at maximum capacity. E- The following dummy antenna circuit is reoomntended, since it ie adapt able for any frequency range. The grid cap should remain in place during V .OSI MFD X F LEAP .ooo z _ _ _ rtfo - GENgRACTOO. uj-r 71 r too * .COO+JJW 40C-&- Z O riCRONCMRlCS o ret* ant

6、_ REC.&NO iis &_r-JT -1 r - _ jj _ SCXXET VOLTAGE READINGS Voltage taken from ground with line voltage at High voltage reading off reotlfler * 275 V. Drop across speaker field 75 V. Voltage taken with 1,000 Ohe per volt meter - 117 AC. 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