|30,000 yen(June, 1994 release)
The exclusive phone equalizer unit which enables playback of an analog record by
Record playback is attained by extending from the rear panel side.
AD-250 equips the printed wired board of the glass substrate formed into
the golden plate with the exclusive input circuit which matched the cartridge of
It is made to consistent with the high-output impedance of a
cartridge at the time of MM input, and it has FET composition of high S/N.
Moreover, since a minute signal is received by low impedance, the difference
input circuit by a low noise element is constituted, it is attaining low
impedance-ization of a NFB loop at the time of MC input, and it is enabling
little reproduction of noise.
Selection of the MC input impedance 10,
30, and 100ohm and the Subsonic Filter which cuts a super-low-pass noise are
carried in the core.
Before these functions equip with AD-250, they can be
set up with the switch in a printed circuit board.
(at the time of C-250 connection)
||The phone equalizer unit only for C-250
||AD Input: 20Hz-20kHz±0.2dB
(an Output power / 0.5V output)/impedance
|AD MM: 8.0mV/2.0mV/47kohm
0.25mV/0.063 mV/10ohm, 30ohm, 100ohm
|Input short-circuit, IEC-A compensation (at
the time of a rated input)
|Input conversion noise
(input short-circuit, IEC-A compensation)
|The AD maximum inlet pressure
(1kHz, distortion 0.005%)
||AD MM Input->Balanced/Unbalanced Output:
AD MM Input->Rec Output: 30dB
Input->Balanced/Unbalanced Output: 78dB
AD MC Input->Rec Output: 60dB
||25Hz, -12 dB/oct
(It sets up with the
core DIP switch of AD-250)