Admiral-SS644 电路原理图.pdf

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1、VOLUME R-19, MOST-OFTEN-NEEDED 1959 RADIO SERVICING INFORMATION Admiral i2bi-i2bia-5T4a chassis Models 632, 633, 634, 642, 643, 644, 649, 654, 662, 663, 664, 671, use Chassis 12B1. Chassis 12B1A has a different panel; used in later Model 649. Same model numbers with prefix SS use auxiliary stereo un

2、it 5T4A. (Additional material on pages 10-11) r-r*. DRUM POSITIONS-* I SHOWN WITH GANG 4. FULLY OPEN PULLEY LOCATED BEHIND UPPER DRUM AND GANGED TO SAME SHAFT-, INOC.U -DRUM GANGED TO TUNING CAPACITOR SHAFT DRUM /( POSITIONS SHOWN WITH GANG FULLY OPETTi DRUM GANGED TO TUNING CAPACITOR SHAFT- PULLEY

3、LOCATED BEHIND- /A UPPER DRUM AND GANGED TO SAME SHAFT Run changes refer to 12B1 schematic diag ram on next two pages. Start of prodactton !2Bt. (JJR25 (t5K,1W) chonged to (22K,iW) to permit full inter changeability 6BE 6 tubes. R33 changed to (390K,t/2W); R34 to (IOOK, 1/2W) and C39 to (. 002MF) to

4、 improve AM operation. R 70 (470Kt !/2W) odded between Mtt ond M12 to minimize rumb te. ) R70 (470K, 1/2 W) removed to increase chonnet seperohon tor stereo operohon. To insure proper operation of OFF-ON-POWER retoy at tow tme voltages, R45 (39K, 2W) removed ond R7t (33K, 2W) odded m its ptoce. Stri

5、nging Diagram. (Early Production) VAPe2AX7 INPUT G EL84 MASTER kJ 12aY7%x. EL84 T86i6 o -LJQ Qlj Q 6AU6-6BA6-6AU6 w GZ34 or- . 5AR4 Stringing Diagram. TAPE OR 616 2AX7 3D 1 SPEAKER SOCKET Top View of 12B1 Chassis, Tube Locations Shown. Top View of 5T4A Chassis J(/4) To educe possibility of regenerat

6、ion m strong N signal oreos, 08 1.02MF) ond C2t (.02MF) removed, R72(75K 5%) and R73 ( 75F.5X) odded to IF section. R65 (80K) connected to 8 * 200 V. For stondordizohon of potts, C9A and 8 (duo! .004MF: V2 screen ond filament bypass) removed. CI9 (.OtMF) V2 screen bypass and C72 ( 005MF) V2 filament

7、 bypass odded. C22A ond B (duot .004MF; V3 screen ond filament bypass) removed. C22 (.OtMF) V3 screen bypass ond C73 I STEREO (-005MF) V3 filament byposs added, I Q QC C24A and 8 (duo! .004MF; V4 screen ond CONTROL Titoment byposs) removed. C24 (.O/MFt il V4 screen byposs and C?4 /.005MF) V4 | filom

8、ent bypass, odded. V8 changed to ECC83. JL, Fo improved freguency response, CS5 f* chonged to .02MF, C64 chonged to 02MF, l_J C66 ond C6? each chonged to .022MF. IMl C75 (.OO/MF) odded from ptote to screen of VP C76(00MF) odded from ptote to screen of Vt2. To increose AM oudio output, R33 changed y

9、to tOOK ond.-R34 changed o 390K. R7A O (tOOK, IW) odded. R?5 (to ohms, t/2 watt) odded between pm 2 of vtB ond R2 to reduce possibility of RF regeneration. Schematic of 5T4A Amplifier Chassis Stamped Run 10. V212AX7 PHASE INV. EL84/6BQ5 AUDIO OUTPUT VI 03 _ SBI 81-1 STEREO AID OC COHTROl CABLE,(S (H

10、OT USED ON All MODELS) MI03 STEREO TAPE MI02 INPUT RECORD-PUT i rS*Tjl_ j RECOROJT PUT V212AXT EL84/6BQ5 T AU0I0 OUTPUT 1- . VI04 *AURESISTOR VALUES IN OHMS A*0 CAPACITOR VALUES IN MICROFARADS UNLESS OTHERWISE SPECIFIED. ALL VOLTACES TAKEN l|TH VACUUN TUBE VOLTMETER. FOR VOLTAGE READINGS, ALL CONTRO

11、LS AT MID-ROTATION AND NO SICNAL APPLIED. VOLTACES TAKEN NlTH AMPLIFIER CONNECTED TO MASTER UNIT. AMPLIFIER MAT BE DPERATEO SEPERATELT 8T PLACING JUMPER IRE ACROSS RELAT TERMINALS (AMDS. * MEASURED WITH Mt09 DISCONNECTED. t MEASURED WITH ViOS REMOVED FROM SOCKET. f MEASURED WITH ViOi, Vi02. VIOJ ANO V10* REMOVED FROM SOCKETS. 9 收音机爱 好者资料库 RadioFans.CN