This document describes the Hitachi HT-MD30, a belt-drive semi-automatic turntable. It is designed for playing vinyl records and offers a blend of user-friendly features and solid technical specifications.
Function Description
The Hitachi HT-MD30 is a record player that allows users to enjoy their vinyl collection. It features a belt-drive system, which is known for reducing motor noise and vibration transmitted to the platter, resulting in cleaner sound reproduction. The turntable is semi-automatic, meaning it initiates playback automatically when the tonearm is moved to the record and returns the tonearm to its rest position at the end of a record, or when the user presses the "stop" button. This semi-automatic functionality adds convenience and helps protect both the stylus and records from accidental damage.
The device supports two common playback speeds: 33 1/3 RPM for LPs (long-playing records) and 45 RPM for singles. A 45 RPM adapter is included for playing records with larger center holes. The turntable is designed for easy connection to an amplifier, specifically compatible with Hitachi HRD-MD30, HRD-MD40, and HRD-MD50 models, though it can be connected to any amplifier with a phono input.
Important Technical Specifications
- Type: Belt-drive semi-automatic turntable
- Motor: DC servo motor
- Speeds: 33 1/3 and 45 RPM
- Platter: 205 mm diameter
- Wow and Flutter: 0.07% (WRMS)
- Signal/Noise Ratio: 65 dB (DIN-B)
- Tonearm: Static balance type
- Effective Length: 205 mm
- Overhang: 19 mm
- Cartridge: Moving Magnet (MM) type
- Stylus Pressure: 2.5 g (fixed)
- Output Voltage: 2.5 mV (1 kHz, 5 cm/sec)
- Load Impedance: 47 kOhms, 100 pF
- Power Source: 12 V DC (from HRD-MD30 or HRD-MD40 or HRD-MD50)
- Power Consumption: 3 Watts
- Dimensions (W x H x D): 370 x 89 x 340 mm
- Weight: 3 kg
The belt-drive system, coupled with a DC servo motor, ensures stable platter rotation and minimizes speed fluctuations, as indicated by the low wow and flutter specification of 0.07% WRMS. The signal-to-noise ratio of 65 dB (DIN-B) suggests a relatively clean audio output with minimal background noise. The static balance tonearm with a fixed stylus pressure of 2.5g is designed for optimal tracking with the included moving magnet cartridge. The turntable's compact dimensions and light weight make it a manageable addition to most audio setups.
Usage Features
The HT-MD30 offers several features to enhance the user experience:
- Automatic Mechanism: The turntable automatically starts playback when the tonearm is moved to the record and returns the tonearm to its rest position after the record finishes. This protects the stylus and record from damage.
- Manual Operation: While semi-automatic, the tonearm can also be manually cued onto a record using the cueing lever, allowing for precise placement.
- Disc Play:
- Place a disc on the platter mat.
- Select the desired speed (33 1/3 or 45 RPM) using the speed select button.
- Move the tonearm from its rest position towards the record. The platter will start to rotate automatically.
- Lower the tonearm using the cueing lever, or allow the automatic mechanism to lower it.
- At the end of the record, the tonearm will automatically return to its rest position, and the platter will stop.
- Replacing the Stylus: The manual provides instructions for replacing the stylus when it becomes worn or damaged, ensuring continued optimal sound quality.
- Connection to Amplifier: The turntable connects to an amplifier via a phono input. It requires a power supply from a compatible Hitachi amplifier (HRD-MD30/MD40/MD50) or a separate power supply unit. The manual includes diagrams for proper connection.
- Rubber Placement: A crucial step during initial setup is to correctly place the rubber stopper under the platter, which is essential for proper operation and to prevent damage during transport.
- Power Supply: The turntable is powered by a 12V DC input, typically supplied by a compatible Hitachi amplifier, simplifying the power connection in a matched system.
Maintenance Features
Regular maintenance is crucial for the longevity and optimal performance of the HT-MD30:
- Cleaning:
- The stylus should be periodically cleaned with a soft brush to prevent the accumulation of dust.
- The dust cover and turntable cabinet should be wiped with a soft, dry cloth. Avoid using harsh chemicals or abrasive materials that could damage the finish.
- Troubleshooting: The manual includes a "CAUTIONS" section that addresses potential issues like howling (acoustic feedback), induction hum, and general warnings.
- Howling: To prevent howling, ensure the turntable is placed on a stable, vibration-free surface, away from the speakers.
- Induction Hum: If an induction hum is heard, it may be caused by the turntable being too close to a motor or transformer. Repositioning the turntable or changing the installation position of the transformer may resolve this.
- General Safety: The manual emphasizes important safety precautions, including warnings about electric shock, fire, and moisture. It advises against opening the cabinet or attempting repairs, recommending qualified service personnel for any issues beyond basic maintenance. Always unplug the unit from the power source before cleaning or servicing.
The Hitachi HT-MD30 is a straightforward and reliable turntable designed for ease of use and good sound quality, making it suitable for both casual listeners and those looking for a dependable entry-level record player.
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