Sparks-Withington-Co-8L9 电路原理图.pdf

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1、MANUAL OF 1949 MOST-OFTEN-NEEDED RADIO DIAGRAMS CHASSIS “819 Sparton Superheterodyne M0DEL_ 121,1058.1059,1060 STEP BY STEP ALIGNMENT PROCEDURE *0 064, 1072 ALIGNMENT OTffiRATOR OF CONNECTS) TO IXMCr (JfflJKRATOR BAND TUNING ANT. FREQUENCY SWITCH COND. SETTING SETTING Set dial pointer even with left

2、-hand stop line with condenser gang closed. Connect output meter across speaker terminals. Pin ff of 6bb5 Conv. Tube .02 MFD. Cond. 456 KC. T4 Sec. Slug Max. Reading T4 Prl. Slug Max. Reading T2 Sec. Slug Max. Reading T2 Pri. Slug Max. Reading Repeat operation #3- A.M. Ant. AJI. - R.F. On Cabinet Re

3、peat operations #5 and #6 Check Calibrations at 600, 1000 and 1500 KC. _ F.M. - I.F. Alignment using an aJI. Generator and Output Meter. Open C2D Ant. Tri. I Peak Accurately 15 F.M. Pin il of 2nd .02 MFD. iq.7 jjc. FJ1. Ratio Det. 6BA6 Tube Cond. Sec. Slu 15 Pri. Slug Max. Readin Max. Reading NOTE:

4、Operations 11, 13, 14. 15. 18 and 19 must be made with generator output as low as possible, consistent with a usable output meter reading. _ Gjon T5 Sec. Slug Max. Reading T3 Prl. Slug Max. Reading T1 Sec. Slug T1 Prl. Slug I Max. Readl Pin #1 1st 6AB6 Tube mm Cont. Tube .02 MFD. Cond. 10.7 mo. F.M.

5、 Open .02 MFD. Cond. 10.7 MC. FJi. Open Adjust secondary slug on l5 ratio detector traneformer to minimum deflection or dip on output meter. Under certain conditions it is possible to adjust l5 8*c. slug to minimum noise with the receiver tuned to a weak station. This operation is very critical and

6、the receiver must be tuned to the center response only. _ T.M. - R.F. alignment using an A.M. generator with frequencies of 88 to 108 MC. and a vacuum tube voltmeter, or D.C. voltmeter. (20,000 OHMS per volt). F.M. Ant. Place meter across C32 elect, condenser. (Meter reading approx. 1 volt.) _ C39 o

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