AKAI X-100D

Commentary

Tape deck with cross field head.

Cross-field head is used for the head part.
This head was the first to be put into practical use by AKAI. In the conventional recording method, a signal current and a bias current are applied to the recording head together, but the recorded signal is erased or weakened by the influence of a wide bias magnetic field.
In the cross-field method, the signal current is applied to the recording head, and the bias current is applied to the external bias head. Moreover, each head is located at a predetermined spatial position with relative offset, so that the signal recorded on the tape is not adversely affected by the bias field.

Uses a hysteresis synchronous 2-speed motor.
The amplifier section is equipped with an all-silicon transistor solid-state preamplifier.

Equipped with automatic shut-off mechanism, tape cleaner, DIN jack, stereo headphone jack, 3-digit tape counter and VU meter.

It uses a universal power supply voltage selector and can freely change the voltage between 100 VAC ~ 240 VAC. It can be used at either 50 Hz or 60 Hz.

It can be used either horizontally or vertically.

38cm/s is also supported by using an adapter.

Model Rating

Type	Tape deck
Tape speed	4.75cm/s(1 7/8inch/s) 9.5cm/s(3 3/4inch/s) 19cm/s(7 1/2inch/s) 38cm/s (15inch/s, when using adapter)
Wow flutter (during playback)	0.15% RMS or less (19cm/s) 0.25% RMS or less (9.5cm/s) 0.35% RMS or less (4.75cm/s)
Frequency characteristic	19cm/s : 30 Hz to 23 kHz ± 3 dB 9.5cm/s : 30 Hz to 18 kHz ± 3 dB 4.75cm/s : 30 Hz to 9 kHz ± 3 dB
Total harmonic distortion factor	3% or Less (1 kHz, 0 VU)
Signal-to-noise ratio	45 dB or more
Input level	Mic (jack) : 0.5 mV or more Line (jack) : 50 mV or more
Output level	0VU(1.23V RMS)
Recording (playback) compensation characteristics	NARTB characteristics
Recording bias frequency	60kHz
Recording level indication	2 x VU meter
Recording system	4-track stereo / monaural, cross field bias system (Japanese Patent No. 451906)
Fast-forward and rewind method	90 seconds each (370m tape, 50 hz) 75 seconds each (370m tape, 60 hz)
Recording time	Mono : 8 hours (370m tape, 4.75cm/s) Stereo : 4 hours (370m tape, 4.75cm/s)
Heads	Recording / Playback : 4-track stereo / mono (low impedance, 1 kHz, 1k Ω) Bias Head : 4-track stereo (low impedance, 60 kHz, 500 Ω) Erase Head : 4-track stereo (low impedance, 60 kHz, 300 Ω)
Motor	Hysteresis synchronous 2 speed motor
Semiconductor used	Transistor : 11 Diode : 2 pcs Requestor : 2
Power supply voltage	6-step switching between 100 V ~ 240 V AC, 50Hz/60Hz
Power consumption	55VA
External dimensions	Width 340x Height 340x Depth 230 mm
Weight	13.5kg