Nikko alpha VI pwr sm

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ALPHA-"VI

STEREO POWER AMPLIFIER

W-TYPE UL and CSA type 120V AC

E -TYPE NK-STD type

V . 220/24OVAC
N -TYPE DEMKO and SEMKO type

CONTENTS

SPECIFICATIONS ................................................................... 1
CIRCUIT DESCRIPTION .......................................................... 2~ 6
DISASSEMBLY ..................................................................... 7
ALIGNMENT ................................................................... 8 ~11
I P c. BOARD ................................................................. 12~15
3 BLOCK DIAGRAM ................................................................. 16
POWER TRANSISTORS MOUNTING ASSEMBLY ....................................... 17
PARTS LOCATION ................................................................ 18
PARTS LIST .................................. 19~23

SEMICONDUCTOR DATA,
TRANSISTORS ............................................................... 23
FIELD EFFECT TRANSISTORS .................................................. 23
\ ZENER DIODES .............................................................. 23
9 DIODES, LED'S ............................................................... 24
INTEGRATED CIRCUIT ......................................................... 24
CORRECTION OF SCHEMATIC DIAGRAM ............................................ 25

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ALPHA-VI

SPECIFICATIONS

AMPLIFIER SECTION

Continuous Power Output per channel:

20 ~ 2000 Hz (8 ohms) ...... more than 300 Watts
20 ~ 2000 H2 (4 ohms) ...... more than 330 Watts
1000 Hz (8 ohms) .......... more than 340 Watts
1000 Hz (4 ohms) .......... more than 340 Watts
*1000 Hz (16 ohms, BTL) ..... more than 700 Watts
1000 Hz (8 ohms, BTL) ...... more than 650 Watts
1000 Hz (4 ohms, BTL) ...... more than 660 Watts
T. H. Distortion, 8 ohms:
at Continuous Power Output . . no more than 0.008%
at 1 Watt Power Output ....... no more than 0.02%

T. H. Distortion, 4 ohms:

at Continuous Power Output . . . no more than 0.02%

*T. H. Distortion, 16 ohms, BTL:

at Continuous Power Output . . no more than 0.008%

T. H. Distortion, 8 ohms, BTL:

at Continuous Power Output . . . no more than 0.02%

T. H. Distortion, 4 ohms, BTL:

at Continuous Power Output . . . no more than 0.1%

GENERAL

Power Requirement:
W-TYPE ................... AC 120V, 60Hz

E, N-TYPE ............ AC220/240V. 50/60HZ
Power Consumption: ............. 1 KW (1.4 KVA)

Ambient Temperature during Operation: . . -10 ~ 30°C

*Specifications are subject to change without notice.

it - - - Canadian model only.

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9%

l. M. Distortion, 8 ohms:

at Continuous Power Output . . . no more than 0.01%

at 1 Watt Power Output ....... no more than 0.02%
IHF Power Bandwidth, 8 ohms: ........ 10 ~ 40000Hz
Damping Factor at 1000 Hz, 8 ohms: . . . . more than 150

Frequency Response, "NORMAL" input, 3 ohms:
at 1 Watt Power Output ..... 25 ~ 100000H2 i 2 dB

Input Sensitivity for 300 Watts Power Output:
MAIN IN ..................... 1Vi1.5dB

Signal to Noise Ratio, IHF A" Network:
MAIN (NORMAL, DIRECT) . . . better than 115 dB

Signal to Noise Ratio, DIN Filter:

MAIN IN (NORMAL, DIRECT) . . better than 90 dB

Subsonic Filter ("NORMAL" input):
at ISHZ ..................... ~3dBi2dB)

Channel Balance: ............... no more than 1 dB

Residual Hum and Noise, 8 ohms: . . no more than 0.3 mV

Idling Current: .................... 50 ~ 120 mA
Midpoint Voltage: .................. 0 t 100 mV
Muting Delay Time: ................ 3 ~ 9 Seconds
Dimensions:
Width ............... 482 mm (19 inches)
Height .............. 182 mm (7 1/4 inches)
Depth ............... 465 mm (18 5/16 inches)

Weight, without package: ........ 27,5 kg (60.5 lbs)