Montgomery-Ward-and-Co-62-265 电路原理图.pdf

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1、MANUAL OF MOST-OFTEN-NEEDED RADIO DIAGRAMS WARDS AIRLINE RADIO MODELS 62-425 and 62-265 The tube complement of this chassis is as follows: 1 Type 6A7pentagrid oscillator and first detector. 1 Type 78 remote cut-off pentode as I.F. amplifier. 1 Type 75 duplex diode triode as diode detector, A.V.C. an

2、d A.F. 1 Type 41pentode output tube. 1 Tvpe 5Z4 or 5Y3high vacuum rectifier. ALIGNING INSTRUCTIONS: .CAUTIONNo aligning adjustments should be attempt ed without first thoroughly checking over all other possible causes of trouble, such as poor installations, open or grounded antenna systems, low line

3、 voltages, defective tubes, condensers and resistors. In order to properly align this chassis, an oscillator (generator) is absolutely necessary. No aligning adjustments should be attempted with the chassis in the cabinet. Remove the knobs and the two bolts which are used to fasten the chassis. All

4、adjustments should be made with a non-metallic screw driver. RESONANCE INDICATOR: Use as a resonance indicator an ontput meter connected across the primary of the speaker inpnt transformer, or by means of an adapter between the plate and screen terminals of the type 41 output tube. Use only enough s

5、ignal to get a readily readable ontput. A low range output meter or the low scale of a multi-range voltmeter should be used. ALIGNING I. F. TRANSFORMERS: (465 K. C.) Connect external oscillator which has been adjusted to 465 kilocycles in series with .1 mfd. condenser, to the control grid cap of the

6、 type 6A7 tube. Ground the chassis to the oscillator. Adjust output I.F. transformer (No. 108-83) and input I.F. transformer (No. 108-82) to resonance. See label on bottom of cabinet for location of these transformers. R. F. ALIGNMENT: (535-1720 K. C.) 1. With gang condenser in its minimum capacity

7、position, plates entirely out of mesh, connect an external oscillator in series with a 200 mmf. condenser to tan antenna and black ground leads and make the following adjustments: (a) With external oscillator set at 1720 kilocycles, adjust oscillator trimmer (rear of gang condenser). (b) Re-set exte

8、rnal oscillator to 1400 kilocycles, rotate con denser, pick up oscillator signal and adjust antenna trimmer to resonance (front section of gang condenser). (c) Check sensitivity at 600 and 1000 kilocycles. mt-Acr j &or-T Description In Set Volume Control and Switch (1 meg ohm) 1 Two Gang Variable Co

9、ndenser 1 Line Cord & Plug 1 Ivory Bakelite Knob (Model 62-265) 2 Brown Bakelite Knob 1 Spring for above knob 2 DIAL PARTS LIST Pilot Light Socket 1 Dial Crystal onlyless escutcheon 1 Dial Pointer Complete with screw 1 Brown Bakelite Escutcheon complete with crystal 1 Ivory Bakelite Escutcheon complete with glass (Model 62-265) 1 Dial Scale 1 6-8 Volt, T-51 Pilot Light Bulb 1 Pointer Bushing Stud 1 Pointer Bushing Assembly 1 Drive Pulley 1 Dial Bracket Take-up Spring Drive Belt 1 Horse Shoe Washer 1 COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 111 收音机爱 好者资料库 RadioFans.CN