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The Hitachi IA-1000 is a rare and sought-after integrated amplifier from the early 1970s, known for its distinctive "constant current drive" system designed to minimize distortion. This model was part of Hitachi's premium Lo-D line, which aimed to provide high-fidelity performance. Rather than the direct-coupled system typical of the time, the constant current drive allows the driver stage to operate with high impedance, reducing distortion for improved sound clarity and smoothness.
 
Known for its robust design, the IA-1000 includes a mix of metal and veneer, giving it a high-quality aesthetic appeal. It has a power output of 55 watts per channel at 8 ohms and offers a frequency response from 10 Hz to 100 kHz, which contributes to its balanced and clear sound profile.
 
This model uses carefully selected silicon transistors to ensure Hi-Fi quality sound. The equalizer section features a high-gain, low-noise hybrid IC (FA-6001T), providing a broad dynamic range and stable performance. In addition, it employs a BAX tone circuit, a type of tone control that allows users to adjust sound frequencies for personalized audio shaping. The IA-1000 also has unique features such as a center channel output, enabling a center woofer system, and a microphone mixing amplifier for blending with other sources.
 
For vinyl enthusiasts, the IA-1000 includes a built-in head amplifier for MC cartridges, allowing compatibility with low-output cartridges, which was a rare feature at the time. The preamp and main amp can also function independently, making it versatile for different audio setups. An electronic protection circuit further ensures reliable operation and protection of internal components, adding to its robust design.
 
 

Hitachi IA-1000 / Pre-Main Integrated Amplifier / Rare

$699.00 Regular Price
$664.05Sale Price
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  • The Hitachi IA-1000, introduced in the early 1970s, is a highly regarded integrated amplifier that offers a unique blend of vintage aesthetics and robust engineering. Here are some key details about its design and performance characteristics:

     

    • Power and Output: The IA-1000 delivers 55 watts per channel at 8 ohms. It employs a cap-coupled design, popular at the time, which contributes to its warm and rich tonal character. This design choice is especially appreciated by vintage audio enthusiasts who favor its smooth audio response and characteristic analog warmth.

     

    • Build Quality: Known for its solid construction, the IA-1000 features an all-metal casing with veneered wooden side panels that add a refined, classic look. Its VU meters, solid knobs, and attenuated tone controls contribute to its functional yet elegant design. The amplifier is relatively easy to service due to its modular PCB card layout, a thoughtful feature that simplifies access to components for repairs and upgrades.

     

    • Phono Stage Options: The IA-1000 includes both MM (moving magnet) and MC (moving coil) phono inputs, making it versatile for various types of turntables. This flexibility was relatively advanced for its time and makes the IA-1000 especially appealing to vinyl enthusiasts who value options for different cartridge types.
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