Hitachi IA 1000 Service Manual

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HITACHI

Hitachi. Ltd. Tokyo Japan

HITACHI HI-EI COMPONENT

PRE-MAIN AMPLIFIER
MODEI. IA-IOOO

SERVICE MANUAL

l A-1000
No.35 1971
1. SPECIFICATIONS

Type: ....................... Solid State Stereo Amplifier PHONO-2 .................................. 70dB
Circuit systcmz. . . . Sub-Complementary SEPI constant current TUNER AUX ................................ 85dB
drive system 0T1. circuitry Most suitable loading impedance: ................... 4- 160

Semi-conductor: ............................... IC: 2 Damping factor: .............................. 50 (80)
Transistor: 36 Equalizer characteristic: .................... RIAA :0.5dB
Diode: 18 Bass control ........................... i lZdB (IOOHZ)
Music power (IHF): ......................... 140W (80) Treble control: ......................... i lZdB (10kHz)
Practical output: .......................... SS/SSW (80) Loudness control (VolumeélOdB): +10dB(50Hz), +4dB(10kllz)
Rate of all higher harmonic distortion: ............... 0.5% Iii-filter (12dB/oct): .................... lOdB (lOkHz)
Frequency characteristic: .................. 201127 801(Hz Low filter (lZdB/oct): ..................... -8dB (SOIIz)
(only Main Amplifier) Rating power consumption: ............. 120V/6OH2 120W
Input sensitivity: (for U.S.A. standard)
(at an output lkHz, 40W) 120V/60Ilz 87W

* The numerals in parentheses show input impedances. (for Canada standard)
PHONO-l MC ................... 0.25mV (2000) 220V, SO/60Hz 120W
MM ...................... 2mV (50k0) 240V, 50/60Hz 120W

PHONOQ ,,,,,,,,,,,,,,,,,,,,,,,,,,,, SmV (501(0) Cabinet dimensions: ........ 446 (W) x 137 (H) x 330 (D) mm
MIC ................................. 2mv (35km (17-5/8 x 5-3/8 x 13 in)
TUNER ........................... 140mV (1001(0) Weight: ............................. 12.6kg (27.8 lbs.)
AUX-1, 2 .......................... 140mV (100k0) ACCessory devices: ...... VU meter, Micr0ph0ne mixing
TAPE IN (Pinjack) .................. I40mV (lOOkQ) circuitry, Loudness switch, [Ii-filter
TAPE IN (DIN) ..................... SOOmV (1001(0) switch, Low filter switch, Tape moni-
Recording output (at a rating output): toring switch, DIN connector,
TAPE OUT (Pin jack) ....................... 140mV Headphone jack, PHONO input
TAPE OUT (DIN) .......................... 40mV sensitivity change-over switch, AC
Center channel output: ....... 2.5V (at both channel outputs) auxiliary power, Speaker changeover
Channel separation: . switch, Center channel output
PliONO-l, 2 ....................... More than 50dB terminal, Pre-amp. output terminal,

TUNER ' AUX ..................... More than 50dB Main amp. input terminal,

Signal-to-noise ratio (IHF):
PIIONO-l ..................... (MC) 60dB, (MM) 65dB

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2. FEATURES

9.0.00.

Noise has been reduced to the minimum and S/N (Signal-to-Noise) ratio has been further improved by the
adOption of Hitachis high-performance, low-noise type hybrid IC (Integrated Circuits) in the equalizer
section.

Since the tone control uses the NF type step-system, clear tone effect can be enjoyed.

Complementary ITL, OTL circuits of constant current drive system and Hitachi high-performance silicone
transistors have realized the lowest distortion and minimum noise.

Since an arnplifier for the exclusive use of a micrOphone is built-in, mixing with other program source is
possible.
commenting on record concerts.

This amplifier can be used without any input transformer, because the head amplifier for MC (Moving
Coil) type cartridge has been installed in the amplifier.

It is possible to use this model for various purposes, because the lA-lOOO is equipped with a pre-main
detachable terminal.

Using the center-channel output terminal makes it possible to utilize this model as a center woofer system.
An electronic protection circuit is adopted for safety use.

The one-touch system of speaker connection terminal makes speaker connection easier.

The VU meter built-in is convenient for output and balance ascertainment.

Therefore, this model is very convenient for singing songs with background of some records or

3. FRONT AND REAR PANEL

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Fig. 1 FRONT PANEL

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Fig. 2 REAR PANEL

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