DACT CT100 phono stage


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 Click here to download PDF version (289KB) of this CT100 data sheet.
 Phono preamplifier module with very accurate RIAA equalization (0.05dB).

 Adapts to practically all MC and MM cartridges on the market through a wide range of gain, input resistance and input capacitance settings.

 No step-up transformer required for MC cartridges.

 Dual-mono design with option for using two separate power supplies.

 Balanced output option built in.

The CT100 is a two-channel phono preamplifier module with very accurate RIAA equalization and many features. It is realized with the best semiconductors available and non-inductive, low noise, SMD metal film resistors. The circuit is designed to accept both moving coil (MC) and moving magnet (MM) transducers/cartridges directly in order to eliminate the need for an external MC step-up transformer or amplifier. MC/MM input loading and input nominal level values are easy to select with high resolution by DIP-switches.
The CT100 is ideal for the most demanding applications requiring accurate RIAA equalization, very low noise, extremely low distortion and superior sonic performance.
CT100 is a pre-assembled PCB ready for building into an enclosure or even better into your turntable (shorter signal cables).
The high output voltage from CT100 makes it equivalent to other signal sources like CD-players.
– Compact design. Dual-mono. Very low noise
– Balanced output option
– Non-inductive low noise SMD metal film
– Input accepts moving coil/moving magnet
(MC/MM) cartridges directly without step-up
– Input loading 10 Ohm to 47kOhm for MC/MM
selectable in 21 steps
– Input nominal levels 0.1mV to 10mV
selectable in 34 steps
   High output drive. Balanced 28V. Unbal. 14V
– High accuracy RIAA equalization with
0.05dB tolerance
– Additional time constants of 3.18uS and/or
7950uS are selectable
– Total harmonic distortion 0.0003%
– Low output impedance – drives long signal
– High output current capability – drives even
impedance headphones
– Two-stage dual-supply voltage regulator on-
board for each channel. Separate DC supply
input for each channel (dual mono)
Note Symbol, parameter (conditions / comments) Value Unit
1 VS, supply voltage +/-50 V
1 VIN, input voltage (AV = 40dB to 80dB) +/-1 V
1 TS, storage temperature range -40 to +85 deg. C
Note Symbol, parameter (conditions / comments) Value Unit
2 VS, supply voltage range +/-9 to +/-35 V
2 TA, ambient temperature range -25 to +70 deg. C
(Typical values at TA = +25 deg.C and RL = 1k unless otherwise specified)
Note Symbol, parameter (conditions / comments) Value Unit
 RIN, input resistance (DIP-switch selectable) 10,15,18,20,25,30, 40,50,60,70,80,90, 100,150,180,200, 250,400,600,1k,47k Ohm
 CIN, input capacitance (DIP-switch selectable) Approx. 100,200,300,400 pF
3 IB, input bias current (Input bias current cancellation pre-adjusted) Max. 0.5 uA
4 PSRR, power supply rejection ratio (AV = 40dB, 10Hz to 20kHz) 120 dB
RO, output resistance (VO = 1V, DC to 100kHz) 0.1 Ohm
VO, output voltage swing (Unbalanced operation) Min. 14.2 V
IO, output current (RL = 100 Ohm) 25 mA
IS, supply current (Each channel) 22 mA
(Typical values at TA = +25 deg.C and RL = 1k unless otherwise specified)
Note Symbol, parameter (conditions / comments) Value Unit
 VIN, input nominal levels (VO = 1V) (DIP-switch selectable)
(0.10mV ~ AV = 80dB)
(1.0mV ~ AV = 60dB)
(10mV ~ AV = 40dB)
0.10, 0.12, 0.15, 0.18, 0.20, 0.25, 0.30, 0.40, 0.45, 0.50, 0.55, 0.60, 0.70, 0.80, 0.90, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 7.0, 8.0, 9.0, 10.0 mV
 VINO, input overload level (f = 1kHz, AV = 40dB) 100 mV
AV, voltage gain (DIP-switch selectable) 40 to 80 dB
4,5 dAV, RIAA equalization deviation (Ref.= 1kHz, 10Hz to 20kHz) 0.05 dB
BW, bandwidth (-3dB, VO = 1V, AV = 40dB) 2 MHz
4 en, input noise voltage density (f0 = 1kHz, AV = 80dB) 0.5 nV/Hz
4,6 S/N, signal to noise ratio (AV = 40/60/80dB) 98/90/71 dB
4 CS, channel separation (AV = 40dB, 10Hz to 20kHz) 120 dB
4 THD, total harmonic distortion (AV = 40dB, f0 = 1kHz) 0.0003 %
1   Exposure to maximum rating conditions for extended periods of time may affect device reliability.
2   Operating ratings indicate conditions for which other device parameters may not apply.
3   At power up and power down the value may be maximum 5uA for less than one second.
4   Measured with Panasonic Audio Analyzer VP-7722P
5   RIAA time constants are 75uS, 318uS and 3180uS. Additional time constants of 3.18uS and
7950uS are DIP-switch selectable.
6   Input short-circuited. Reference: 1V. Response: RMS. Weighting: IHF-A

Additional information

Weight 0.5 kg