Technical Details
Brand: Akai
Model:1800D-SS
Category:Vintage
Application:Consumer
Electronics:Solid State
Equalization:NAB
Country of Manufacture:Japan
Release dates:1968 - 1972
Original Price: $795
Tracks:1/4 Rec/PB
Speeds: 1 7/8, 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 3
Dimension: 17½ x 16½ x 9½ " (445 x 420 x 240mm)
Head Composition: Permalloy
Head Configuration: Quad
# Motors: 1
Voltage(s): 110-120v
Outputs: RCA
Frequency Response:( 3dB): 7½ ips: 30Hz to 22kHz
Wow and Flutter:less than 0.12% at 7½ ips. less than 0.15% at 3¾ ips
Signal-to-Noise Ratio:better than 50 dB at 7½ ips
Sound quality rating:5 / 10
Long-term reliability rating: 7/ 10
Weight: 46.2 lbs (21 kg)
Additional Details
Description
The 1800D-SS was a single motor, four-channel ‘Surround Sound’ deck with three speeds and a built-in 8-track cartridge unit which was also a four-channel example. Copies could be from four-channel open reel to four-channel 8-track.
Speed change was effected by use of the two-speed motor and a removable capstan sleeve.
The unit featured four separate input levels, four microphone inputs and two headphone outputs.
It could also be used as a quarter-track stereo deck.
The 1800D-SS featured three heads in the reel to reel section, but in an unusual configuration.
It sported a conventional two-head arrangement of one erase and one combined
record/replay head but an extra full-track erase head was fitted for 4-channel
recording. A tape selector switch for either normal or S.R.T. tapes was provided.
Additional Info
USA Price new $800
Track system
quarter-track, four channel surround sound and quarter-track stereo
four-channel eight-track cartridge
Heads
three: full track & quarter-track erase heads, record/replay combined
(reel to reel section)
Motors
one hysteresis synchronous two-speed motor
Frequency response ( 3dB)
7½ ips: 30Hz to 22kHz
3¾ ips: 30Hz to 15kHz
1 7/8 ips: 50Hz to 7kHz
Wow & flutter
less than 0.12% at 7½ ips; less than 0.15% at 3¾ ips
Signal to noise ratio
better than 50 dB at 7½ ips
Distortion
less than 1.5% at 7½ ips (1,000Hz at “0” VU recording)
Erase ratio
better than 70dB
Bias frequency 100kHz
Inputs
4 x Microphone: 0.4 mV impedance 30 Kohms
4 x Line: 40 mV impedance 100 Kohms
2 x DIN: 5mv
Outputs
4 x Line: 1.228V max. load impedance more than 20 Kohms
2 x Din: 0.4V
2 x Headphones (front and rear) : 100 mV at 8 ohms