DACT Stereo Phono Stage Module
HIGH END KIT for PHONO MC/MM module from Denmark

Phono preamplifier module with very accurate RIAA equalization(+/- 0.05dB)
Adapts to nearly all moving coil (MC) and moving magnet (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 two separate power supplies.
Balanced output option.

RIAA Phono Stage Amplifier module

Example of internal view of assembled kit
Assembled kit CT100 with copper cover shielded
Rear view of assembled kit, with balanced BNC socket panel R/L

The CT100  is a two channel phono preamplifier 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 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 resistors
- Input accepts moving coil/moving magnet(MC/MM) cartridges without step-up transformer
- Input loading 10 to 47 for MC/MM selectable in 21 steps
- Input nominal levels 0.1mV to 10mV selectable in 34 steps
- High output drive Balanced +/-28V, Unbalanced +/-14V
- High accuracy RIAA equalization with +/-0.05dB tolerance
- Additional time constants of 31.8uS and/or 7950uS are selectable
- Total harmonic distortion 0.0003%
- Low output impedance-drivers long signal cables
- High output current capability-drivers high impedance headphones
- Two-stage dual-supply voltage regulator on-board for each channel. Separate DC supply input for each channel(dual mono)

Typical Applications
- High performance RIAA preamplifier for MC and MM cartridges
- High performance RIAA headphone amplifier
- Upgrading Hi-Fi equipment
- Reference RIAA preamplifier
- Test equipment RIAA preamplifier

Maximum ratings
Notes Symbol Parameter Value Unit
1 Vs Supply voltage ± 50 V
1 Vin Input voltage (Av = 40dB to 80 dB) ±1  V
1 Ts Storage temperature range -40 to + 85  °C
Notes: 1. Exposure to maximum rating conditions for extended periods of time may affect device reliability.

Operating Ratings
Notes Symbol Parameter Value Unit
2 Vs Supply voltage range ±9 to ±35 V
2 TA Ambient temperature range -25 to + 70  °C
Notes: 2. Operating ratings indicate conditions for which other device parameter may not apply

DC Electrical characteristics
typical values at TA = +25
°C, Vs = +/- 20V and RL= 1KΩ unless otherwise specified
Notes Symbol Parameter 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, 1000, 47K
  Cin Input capacitance (DIP switch selectable) Approx. 100, 200, 300, 400  pF
3 IB Input bias current  (Input bias current cancellation preadjusted) Max. 0.5  uA
4 PSRR Power supply rejection ratio (AV = 40 dB, 10 Hz to 20K Hz) 120 dB
  Ro Output resistance (Vo = 1V, DC to 100K Hz) 0.1
  Vo Output voltage swing (unbalanced) Min. ±14.2 V
  Io Output current (RL= 100 Ω) ±25 mA
  Is Supply current (each channel) ±22 mA

AC Electrical characteristics
typical values at TA = +25
°C, Vs = +/- 20V and RL= 1KΩ unless otherwise specified
Notes Symbol Parameter Value Unit
  Vin input nominal levels (Vo = 1V) ]
(DIP switch selectable), (0.10mV ~AV = 80 dB),

(1.0mV ~AV = 60 dB), (10.0mV ~AV = 40 dB),
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= 40 dB) 100  mV
  Av Voltage gain (DIP-switch selectable) 40 to 80  dB
4,5 ¡µAV RIAA equalization deviation (Ref. = 1Khz, 10 Hz to 20KHz) ±0.05 dB
  Bw Bandwidth (-3dB, Vo = 1V, Av= 40dB) 2 MHz
4 En Input noise voltage density (Fo= 1k Hz, Av = 80 dB) 0.5 nV/±Hz
4,6 S/N Signal to noise ratio (Av = 40/60/80 dB) 98/90/71  dB
4 CS Channel separation (Av = 40dB, 10 Hz to 20kHz) 120 dB
4 THD Total harmonic distortion (Av= 40 dB, Fo= 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 can be maximum 5uA for loss than one second
    4.  Measuring instrument: Audio Analyzer VP-7722P Panasonic
    5.  RIAA time constants are 75uS, 318 uS and 3180 uS. Additional time constants of 31.8 uS and/or 7950uS are DIP-switch selectable
    6.  Input short-circuited. Reference: 1V, response: RMS. Weighting: IHF-A

    CT100             Phono Stages NLE17 + panel of two Balanced BNC sockets
    CT100-pow1   Power Supplies +/- 22V for CT100, For 220-240VAC mains. Two adapter's are required to operate CT100 in dual mono. Pin plug is European type.

* CT100 is designed and manufactured in Denmark
* Visiting Danish Audio ConnecT DACT's web pages for more product information
* Latest news letter from DACT