Aiwa AD-1800

Aiwa AD-5700

1 9 7 5 april 1975
1 9 7 6 1976

Horizontal semi-big recorder which has the unusual offering of two noise-reduction systems : Dolby (Dolby) and DNL (Philips).

DNL stands for Dynamic Noise Limiter so it works with a gate and the two systems were meant to be used together.

Also an SST mechanism (Solid and Stabilized Transport) which has a very large 10,4cm / 448g flywheel amounting to 5090g/cm torque and Hall-element driven auto-stop.
Precision-engineered reel axis, 0,05µ capstan finish, 4-point head support, solidary capstan / pinch roller mounting and stabilized power-supply.

The rest is more common : separate bias/eq switches, mic/line mixing, tape run LED, 2-level peak LEDs, auto-zero memory, quick-cue key and oil-damped cassette holder.

The AD-1800 was named AD-5700 in Japan.

Aiwa AD-1800, image 1 Aiwa AD-1800, image 2 Aiwa AD-1800, image 3
Aiwa AD-1800 specifications
Title Value
Motor : AC hysteresis synchronous
Tape speed : 4,8cm/s
Wow & flutter : 0,05% (WRMS)
FF & Rew time : 95s (C60)
Head : Ferrite Guard head (FGH)
Erase : AC system
Recording bias : 105Khz (AC bias)
Frequency response : 30Hz...14Khz (LH)
30Hz...17Khz (CrO2)
30Hz...18Khz (FeCr)
S/N ratio : 65dB (Dolby + DNL on, CrO2)
Inputs : 0,25mV / 600...10kOhm (MIC)
50mV / 100kOhm (line)
0,1mV / ??kOhm (DIN)
Outputs : 0,775V / 50kOhm (line)
0,775V / 50kOhm (DIN)
8 Ohm ('phones)
PC : ??W
Dimensions : 42,3 x 15,2 x 29,5cm
Weight : 7,1kg.
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