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MODEL SX.38OO COMES IN FOUR VERSIONS DISTINGUISHED AS FOLLOWS:
Type Volt4e Remarks
KU 120V only U.S.A. model
s/G 1 10V, 120V, 22QV, and 240V (Switchable) U.S. Militarv model
s 1 10V, 12OV, 22OY , and 24OV (Switchabte) General exDort model
KC l20V only Canada model
r This service manual is applicable to the KU type. When repairing the S/G and S Wpe, please
see the additional service manual lp 47 -p571. When repairing the KC type. olease see the a-
dditional service manual (ART-519).
CONTENTS
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1. SPECIFICATIONS
2, FRONT PANEL FACILITIES
3. BLOCK DIAGBAM
4. CIRCUIT DESCRIPTIONS
4.1 FM Tuner
4.2 AM Tuner
4.3 Display Circuit
4.4 EqualizerAmplifier
4.5 Tone Control Amplifier
4.6 Power Amplif ier . . .
4.7 Power Indicator Circuit
4.8 Protection Circuit
DISASSEMBLY....
PARTS LOCATION
DIAL CORD STRINGING
ADJUSTMENTS
8,1 FM Tuner
8.2 AM Tuner 22
8.3 PowerAmplifier... 23
8.4 FL Indicator Circuit 24
9. EXPLODED VIEW 25
10. SCHEMATIC DIAGRAM, P.C. EOARD CONNECTION DIAGRAM AND PARTS LIST
10. 1 Schematic Diagram 3l
10.2 P.C. Board Connection Diagram 35
10.3 PartsList ...,...41
11. PACK|NG.... 46
ADDITIONAL SE RV ICE MANUAL
I.SPEC|F|CAT|ONS .....47
2. CONTRAST OF MISCELLANEOUS PARTS . . . . 48
3. SCHEMATIC DIAGRAM, P.C. BOARD PATTERNS AND PARTS LIST
3. 1 Schematic Diagram 49
3.2 Switch Assembly {AWS.148) 57
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1. SPECTFTCATIONS
Power Ampl if ier Section
Continuous Power 0utput of 60watts* per chan-
nel, min., at Sohms from 20Hertz to 20,000
Hertz with n0 m0re than 0.005% total harmo'
nic distortion,
Total Harmonic Distortion (20 Hertz to 20,000 Hertz,
I ohms)
continuous rated power output . . No more than 0.005%
30 watts per channel power output
No more than 0.005%
Intermodulation Distortion (50 Hertz : 7,000 Hertz = 4 : 1)
continuous rated power output No more than 0.0057o
30 watts per channel power output
No more than 0,005%
Frequency Response
. . . . . 5 Hertz to 200,000 Hertz l! OA
lnput Sensitivity/lmpedance (POWER AMP lN)
or,rri
1v/50 kilohms
Speaker A, B, A+B
"-:
:: ::"::'': 1*:": 1o i*
He*z' 8 0hms)
Hum and Noise (lHF, short-circuited, A network)
115d8
Preamplifier Section
I nput (Sensitivity/l mpedance)
PHONO 2.5mV/50 kilohms
AUX,TAPE PLAY 1,2 . . .. . . . 150mVl50kilohms
Phono Overload Level {T.H.D.0.005%, 1,000 Hertz)
PHONO .. .. . 250mV
Output ( Level/l mpedance)
TAPERECI,2 .. ..,. 150mV
PREAMP OUT (Rr_: 50 kilohms)
-....1V/l kilohms {Volume: max.}
Total Harmonic Distortion (20 Hertz to 20,000 Hertz)
Tone Control
BASS . tSdB (100H2)
TREBLE ..... r',l0dB(10,000H2)
Subsonic Filter . 15Hz (-6dB/oct.)
Loudness Contour (Volume control set at *40d8 position)
. . . . +6dB (100H2),+3dB (10,000H2)
Hum and Noise (lHF, short-circuited, A network)
PHONO. .....82d8
AUX,TAPEPLAY 1,2 ..,. . . . 11OdB
Attenuator. ....-20d8
FM Tuner Section
PHONO (REC OUT)
AUX,TAPE PLAY 1,2 . . . . . .
Frequency Besponse
PHONO (RIAA Equalization)
or", iori ,ro" i ,';'o^u"'
to 20'000 Hertz t0'2dB
Usable Sensitivity (lH F )
50dB Ouieting Sensitivity
MONO
STEREO
Signal-to-Noise Ratio
MONO
STEREO
Distortion (at 65dBf)
MONO l00Hz.
lkHz.
6kHz .
STEREO IOOHz.
lkHz .
6kHz -
Capture Ratio. ,
Alternate Channel Selectivity
400kHz ..,..,7ft8
Stereo Separation
1kHz. ......45d8
30H2to15kH2. ...... 35dB
Frequency Response
....2}Hzto15kHz1!loe
SpuriousResponse Ratio, . . . . . . 65dB
lmageResponseRatio ... 65dB
lFResponseRatio.. .... 90dB
AMSuppressionRatio ... 55dB
SubcarrierProduct Ratio . . . . . . . 50dB
SCARejectionRatio .... 64dB
Muting Thteshold 19.2dBf (5pV)
Antenna lnput . 300 ohms balanced,
75 ohms unbalanced.
10.3dBf {1.8itv)
16.2dBf (3.6sV)
37dBf (39pV)
83dB (at 65dBf)
78dB (at 80dBf,
0.1o/o
a.a7%
0.15%
O.2Yo
0.15%
0.25%
r.odB
No more than 0.005%
{10V output}
No more than 0.005%
(10V output)
7Hz to 8o,0oo Hertz ]f aa
