# Hitachi HMA-8300

## Data

**General**

- Manufacturer: Hitachi
- Model: HMA-8300
- Type: Power amplifier, Class G, bipolar power transistors
- Years of manufacture: 1976 - 1979
- Made in: Japan
- Color: Black
- Remote control: No
- Power Consumption:
- 1470 W (220 V - 240 V~ 4 Ohm).

1100 W (220 V - 240 V~ 8 Ohm)

- 850 W or 1020 VA (at 120 V~)

- Dimensions: 435 (W) x 182 (H) x 404 (D) mm
- Weight: 24 kg
- Original price approx.: 2'000 DM

**Connections**

- Number of inputs: 1 (approx. 50kOhm input resistance)
- Number of outputs: 1 loudspeaker pair

**Technical Data**

- Continuous power (at distortion factor)
- 8 Ohm: 200 W/K. + 200 W/K. (20 Hz - 20 kHz, 0.1% total harmonic distortion)
- 4 Ohm: 200 W/K. + 200 W/K. ( 1 kHz, 0.1% total harmonic distortion)

- Dynamic power
- 8 Ohm: 400 W/K. + 400 W/K. (music power)
- 4 Ohm:

- Total harmonic distortion:
- at 1W Less than 0.05%.
- at 100 W Less than 0,05%
- at rated power Less than 0.1%

- Attenuation factor: 50 (20 Hz - 20 kHz, 8 Ohm), 100 (1 kHz, 8 Ohm)
- Frequency response: 5 Hz - 80 kHz (+/-1 dB)
- Signal-to-noise ratio: Noise-to-noise ratio 110 dB (IHF, A-net)
- Stereo channel separation: 80 dB (1 kHz, 8 Ohm)
- Loudspeaker impedance:
- 4-16 Ohm (except for Switzerland, UK & Sweden).

8-16 Ohm (for Switzerland, Great Britain and Sweden)

**Special Features**

- One gain control per channel
- switchable subsonic filter (rumble filter)

## Remarks

- First Class G amplifier ever offered. Marketed initially as "Dynaharmony" and "E-Series" (Series E). Late HMA-8300 models had the "Class G" designation directly. Class G technology reduces power dissipation in the power stage without sonic drawbacks, allowing the design of very high power amplifiers. Class G is widely used in stage and professional music today.

- The HMA-8300 power amplifier is built with bipolar (!) power transistors, which accommodates Class G technology. Hitachi developed and released 'Power MOSFET' transistors in amplifiers at about the same time, but did not use these power transistors in Class G circuits. The HMA-7500, HMA-7500 MkII or HMA-8500 MkII series of power amplifiers and others are built with Hitachi's 'Power MOSFET' power transistors. This other series of Hitachi power amps then had much greater success and the power amps were often reference by HiFi magazines.

- Other Class G ('Dynaharmony') devices from Hitachi:
- Preamplifiers:
- Hitachi HCA-8300

- Power amplifiers:
- Hitachi HA-5300
- Hitachi HMA-8300

- Receiver:
- Hitachi SR-604
- Hitachi SR-804
- Hitachi SR-903
- Hitachi SR-2004
- Hitachi SR-6010
- Hitachi SR-8010

## Pictures

- Image: Hitachi HMA-8300

- Excerpt from brochure: Hitachi HCA-8300, HMA-8300