What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Aiwa AD-F270 (1988)

 Advanced Features for Extra Value
The AD-F270 combines superb features with rellable AIWA quality for an excellent audio value in a quality 2-head deck. The AD-F270 boasts many features commonly found on more expansive decks, like Dolby B and C, high performance DX head, and fine bias control. A perfect blend of features, fidelity and quality, the AD-F270 is an unsurpassed value in sound enjoyment.
  Dolby B and C noise reduction out tape hiss for clear, dynamic recordings. And for the best performance from Normal and CrO2 tapes, the fine bias control on the AD-F270 gives you a +/-20% range of adjustment that makes it easy to "fine tune" bias for optimum response.
Finally, the Ad-F270 is equipped with an array of convenience features including Rec-mute functioning and timer Rec/play for unattended recording and playback with an optional audio timer. That,s your assurance of extra value.

Track:  4-track, 2-channel
Tape Speed:  1 lps (4,8 cm/sec)
Frequency Response
Normal Tape, at -20 VU:  20 - 15,000 Hz, 30 - 12,000 Hz (±3 dB)
CrO₂ Tape, at -20 VU:  20 - 16,000 Hz, 30 - 13,000 Hz (±3 dB)
Metal Tape, at -20 VU:  20 - 17,000 Hz, 30 - 14,000 Hz (±3 dB)
S/N Ratio:  65 dB (Dolby B, Metal); 78 dB (Dolby C, Metal, above 5 kHz)
Wow and Flutter (WRMS):  0,09%
Forward and Rewind Time for C-60 Tape:  125 sec.
Head:  REC/PB: Super Hard Permalloy Head
Erase Head:  Ferrite Head
Motors:  DC servo motor x 1
Input Sensitivity Impedance  Line-In:  50 mV/50 kΩ
Output Level Impedance
Line Out:  0,4 V/50 kΩ
Headphone:  0,14 mW/8Ω
 Power Source:  AC  110-120/220-240 V, 50/60 Hz
Dimensions (W x H x D):  430 x 127,5 x 234,5 mm
Weight:  2,9 kg

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