Nikko beta 50 pre sm

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BETA 30/3034
; BETA 50/505

STEREO PREA M PLIF IER

TYPE AND VOLTAGE

W-TYPE : UL and CSA type 120V AC
E -TYPE : NK-STD type 220V AC
)
I
VETYPE . MuITI-Voitage type K 110/720/220/240V AC

CGNTENTS
SPECIFICATIONS ............... 1,2
BLOCKDIAGRAM 3,4
DISASSEMBLY ............................................. .. ..... I ,I S
PARTSLOCATION....r.,.E..I..,I,,,.(..;.,.I....,..,h,,.,,.; ,,,,,,,, I ..... 6
SCHEMATIC DIAGRAM ............................................. 8,9,12,13
P C. BOARD ........ 1 .......................... , .................. 10,11,14I15
PARTS LIST .......................................................... 7, I6~ 18
SEMICONDUCTOR DATA,
TRANSISTORS ........................................................ 19
FIELD EFFECT TRANSISTORS ............................................. 19
DIODES, LED'S ............................ . ............................ 19
ZENER DIODES ......................................................... 19

|NTEGRATED CIRCUITS ................................................. 20

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mi 30003-567505

mg

SPECIFICATIONS

BETA 3O

Preamplifier Section

Total Harmonic Distortion (at 1,000 Hz).
Phono (MC) to Rec Out (at 7V output):

........... no more than 0.006%
Phono (MM) to Flee Out (at 7V output):
........... no more than 0.006%
Aux to Pre Out (at 1.8V output):
.......... no more than 0.008%
Input Sensitivity (at 1,000 Hz, 1V output),
Phono (MC): ................ 025 mV i 2 dB
Phono (MM): ................. 2.5 mV 1 2 dB
Tuner: ................ 150 mV i 2 dB
Aux: ................ 150mVi2dB
lnput Impedance (at 1,000 Hz),
Phono (MC): ................. 100 t 10 ohms
Phono (MM): .................. 47 t 5 kohms
Tuner: 47 i 10 kohms
Aux: .' ........ 47 t 10 kohms
Tape 1, 2: .................. 47 i 10 kohms
General
Power Requirement,
UtS.A. Bi Canada model: ....... AC 120V/60 Hz
European model: ............. AC 220V/50 Hz
U.K. & Australia model: ........ AC 240V/50 Hz
Power Consumption: ................... 10 watts

Specifications are subject to change without notice.

Signal to Noise Ratio with lHF-A Network,

Phono (MC): ................ more than 62 dB
1 Phono (MM): ................ more than 82 dB
Tuner: .................... more than 90 dB
AUX: ..................... more than 90 dB
Tape 1, 2: ................. more than 90 dB
Frequency ReSponse (20 to 20,000 Hz),
Tuner: ........................ +0, -1 dB
Aux: ......................... +0, -1 dB
Tape 1, 2: ..................... +0, ~1 dB
RIAA Equalization Deviation (30 to 15,000 Hz),
Phono (MM) to Flee Out: ............... :1 dB
Tone Control,
Bass (70 Hz): ................. +7, -9 dB
Treble (10 kHz): ................ +7, -9 dB
Muting Delay Time: ................ 4 i 2 seconds
Dimensions,
Width: ........... 482 mm, 19" (BETA 30)
440 mm, 17-3/8" (BETA 305)
Height: ........... 70 mm, 2-3/4"
Depth: ........... 258 mm, 10-1/8
Weight without package: ........... 4.8 kg, 10.6 lbs