Akai GXC-709D Stereo Cassette Deck, 1977-1979, made in Japan

Link: hifiengine

Specifications
Type: 2-head, single compact cassette deck
Track System: 4-track, 2-channel stereo
Tape Speed: 4.76 cm/s
Heads: 1 x record/playback, 1 x erase
Motor: electronically speed controlled DC
Tape Type: type I, CrO2, FeCr
Noise Reduction: B
Frequency Response: 35Hz to 16kHz (FeCr tape)
Signal to Noise Ratio: 61dB (dolby B)
Wow and Flutter: 0.06%
Total Harmonic Distortion: 2%
Input: 70mV (line), 0.3mV (mic)
Output: 0.41V (line)
Semiconductors: 28 x transistors, 36 x diodes, 2 x FET, 2 x IC
Dimensions: 440 x 165 x 285mm
Weight: 6.5kg

Akai DT-40T Tweeter, 1972-1974, made in Japan

 

Link: hifi-wiki

Akai MPC500 Music Production Center [Restoration & Repair], 10.07.2006, made in Malaysia

 

Link: akaipro | Owner's Manual [PDF, ru]

MPC500 is the first portable MPC. You can sample and create music wherever inspiration strikes: on the subway, on the plane, or even at the beach! Whether you're traveling around the globe or just across town, MPC500 is a perfect fit for your backpack, messenger bag, or briefcase. Beats and productions created in MPC500 can be dropped into your computer via USB or into your main MPC with the swappable CF card when you get back into the studio.

MPC500 is a 48-track sequencer with a 32-voice stereo sampler. It has 12 velocity and pressure-sensitive rubber MPC pads. 16MB of memory comes standard and can be expanded up to 128MB. When connected to a Mac or PC via USB, you can drag and drop data between the computer and your MPC500's CF card, just like a hard drive. Because MPC500 is compatible with other MPCs, MPC500 is the perfect way to extend your studio into your mobile lifestyle.

KEY FEATURES

• Battery powered (6 AAs) or wall powered (AC adapter included)
• Pattern-based 48-track sequencer with 16 MIDI channels
• 32-voice drum/phrase sampler with up to 128MB RAM
• Velocity and pressure-sensitive pads for responsive, accurate programming
• 12-level function places one sound on all pads with progressive level or tuning per pad
• Compact Flash drive and USB port (Mass Storage Class)
• Support for standard WAV files and MIDI sequences
• Analog I/O, headphone output, MIDI I/O
• Sounds included to get started quickly
• Four-way sample layering and velocity switching per pad
• Low-pass filter with resonance per voice
• On-board effects: two stereo effects and a master effect
  
  

Akai AR 900 + Akai AR 900T midi digital reverb [Restoration & Repair], 1986-1989, made in Japan

Link: wikipedia | Akai Professional_1988-1989 | muzines

The Akai Professional AR900 is a stereo 16-bit MIDI digital reverb, that could also be controlled by the optional AR900T remote control. It belongs to the "Akai White Series", a family of musical products launched in the last part of the 1980s. It was produced between 1986 and 1989.

According to Akai Professional's official 1988-89 Musical Instruments catalog: "The AR900 is a high quality 16-bit digital reverb with 20 preset reverb programs. Numerous variations may be created by adjusting the pre delay and the reverb time settings on the front panel. These variations can then be stored in any ofnthe 79 user memories for a total of 99 programs including the 20 presets. Programs may be selected by MIDI, a foot switch, or the infrared remote control accessory. A dual 7-band programmable graphic EQ can be used independently or in conjunction with the digital reverb to enhance the reverb sounds. The AR900 with its wide selection of useful programs has numerous application in both the studio and on stage."

AR900 FEATURES

• 8 program algorithms, 12 factory variations provide a selection of simulated ambient environments
• Independent dual 7-band graphic equalizer (100 Hz, 300 Hz, 600 Hz, 1.5 kHz, 3 kHz, 6 kHz, 10 kHz)
• Sampling resolution and frequency: 16 bit PCM, 39.0625 kHz
• Pre delay time: 0.01-210 msec.
• Reverb time: 1-16 sec.
• Equalizer section: 7-band 2-channel graphic equalizer. ±12db
• Frequency response-Dry: 20 Hz~25 kHz, ±3db
• Frequency response-Effect: 30 Hz~16 kHz, ±2db
• Connectors: LOOP SEND x2, LOOP RECEIVE x2, REV IN x2, EQ OUT x2
• Programs: Standard: 1~8; Factory variations: 9~20; User memories: 21~99
• Dimensions: 482.6(W) x 47.7(H) x 300(D)mm (EIA 1U rackmount)
• Weight: 4 kg

Akai CS-34D Stereo Cassette Deck, 1976, made in Japan

Link: hifiengine

Specifications:
Type: 2-head, single compact cassette deck
Track System: 4-track, 2-channel stereo
Tape Speed: 4.75 cm/s
Heads: 1 x record/playback, 1 x erase
Motor: mechnical governer type DC
Tape Type: type I, CrO2
Frequency Response: 40Hz to 15kHz (Cr02 tape)
Signal to Noise Ratio: 52dB
Wow and Flutter: 0.13%
Total Harmonic Distortion: 3%
Input: 80mV (line), 0.35mV (mic)
Output: 0.775V (line)
Semiconductors: 32 x transistors, 18 x diodes 18, 2 x FET
Dimensions: 378 x 110 x 225mm
Weight: 4.8kg

Downloads
instruction/owners manual
instruction/owners manual
service manual
specifications

Akai SW-157 mk II, 1975-1979, made in Japan

Link: radiomuseum

Specifications
Type: 3 way, 3 driver loudspeaker system
Frequency Response: 30Hz to 20kHz
Power Handling: 30W
Recommended Amplifier: 60W (maximum)
Crossover Frequency: 1200, 5000Hz
Impedance: 8Ω
Sensitivity: 92dB
Woofer: маркировка Akai 30S-56C 7 ohm 30W - 300 mm (12") тканевый с аккуратным количеством пропитки подвес (выворотка) - магнитная система феррит

Midrange: маркировка Akai 12M-56S 8.5 ohm 3W - 1 x 120 mm (5") - магнитная система феррит

Tweeter: маркировка Akai CT-57 8 ohm 20W - 44 mm (1 3/4") - магнитная система феррит

Enclosure: bass reflex
Finish: walnut
Dimensions: 385 x 660 x 290mm
Weight: 16.4kg

Akai AM-2450 Stereo Integrated Amplifier, 1979-1980, made in Japan

Link: hifiengine

Specifications
Power output: 45 watts per channel into 8Ω (stereo)
Frequency response: 10Hz to 60kHz
Total harmonic distortion: 0.1%
Damping factor: 30
Input sensitivity: 3mV (MM), 150mV (DIN), 150mV (line)
Signal to noise ratio: 75dB (MM), 95dB (line)
Channel separation: 55dB (MM)
Output: 150mV (line), 30mV (DIN)
Speaker load impedance: 4Ω to 16Ω
Semiconductors: 27 x transistors, 17 x diodes, 4 x IC
Dimensions: 440 x 144 x 345mm
Weight: 9.9kg
Finish: black, silver

Downloads
service manual

Related Catalogues
Innovation

Akai S950 12Bit Sampler, 1988, made in Japan

 

Link: vintagesynth | polynominal

Specifications
Polyphony - 8 voices
Sampler - 12-bit linear, 7.5 - 40kHz sampling rates (63 seconds). Up to 48kHz in S950.
Memory - 750 kB RAM in S900 (not expandable). 750 kB (standard) to 2.25 mB RAM in S950.
VCA - ADSR
Effects - None
Arpeg/Seq - None
Keyboard - None
Storage - 750K internal RAM. Up to 2.25MB in S950
Control - MIDI plus optional 8 trigger-inputs via ME35T-board
Date Produced

- S900: 1986

- S950: 1988

Country: Japan
Weight: 11 Kg
Dimensions: 482,6 x 132,6 x 410 mm

Akai AT-2450 Fm Am Stereo Tuner, 1979-1980, made in Japan

Link: hifiengine | service manual

Specifications
Type: Mono/Stereo Tuner
Tuning Bands: FM, MW
Tuning Scale: Analogue
FM Tuning Range: 87.5 to 108 MHz
MW Tuning Range: 520 to 1605 kHz
Sensitivity: 1.7uV (FM), 15uV (MW)
Signal to Noise Ratio: 75dB (FM), 55dB (MW)
Distortion: 0.2% (FM)
Selectivity: 80dB (FM), 30dB (MW)
Frequency response: 20Hz to 15kHz (FM)
Output: 2000mV
Semiconductors: 9 x transistors, 14 x diodes, 1 x FET, 4 x IC
Dimensions: 440 x 144 x 368mm
Weight: 7.3kg