High quality 2-channel line stage / linear preamplifier module, made by Danish Audio ConnecT (DACT). CT101 is used by high-end audio and A/V equipment manufacturers and by DIY audiophiles. CT101 is ideal as the active line stage in a preamplifier. It is designed to match the DACT stepped attenuators CT1 or CT2, which mounts directly into the CT101 PCB. Combining it with DACT's CT3 input selector switch and CT4 balance control, will make a complete high-end preamplifier at the fraction of the cost of ready-made equivalents.

CT101 line stage / linear preamplifier module
DACT logo

High-end sound

2-channel linear
precision preamplifier

Ready-assembled PCB

CT101 line stage / linear preamplifier module.


CT101 is a linear 2-channel widebanded audio buffer / preamplifier. It is built on a compact PCB, which together with the use of SMD components yields a very short signal path.
CT101 is built as two mono preamplifiers on one PCB, and can be power by two individual supplies. The active devices are special ICs, and the power supply connections are decoupled with SMD capacitors.


  • Selectable gain 0, 6 or 12dB
  • Wide power supply voltage range
  • Low supply current
  • Use of special active devices and SMD resistors for low distortion, large bandwidth and superb sound
  • Compact PCB, low inductance, low stray capacitance
  • True dual-mono when using separate power supply for each channel
  • SMD power supply decoupling capacitors
  • Dual supply voltage regulators for each channel
  • All connectors and PCB traces gold plated
  • Drives difficult loads / long cables


  • High performance gain/buffer preamplifier for CD-players, etc.
  • High performance headphone amplifier
  • For upgrading Hi-Fi and A/V audio equipment
  • Reference audio preamplifier
  • Large bandwidth amplifier

Use CT101 to build an active high quality 2-channel audio preamplifier. One of DACT’s stereo CT1 or CT2 stepped attenuators may be solder directly onto the PCB (see the photo on the right) to adjust the volume. This is an almost ideal preamplifier for sources like CD-players. You may add DACT’s CT3 audio input selector switch and/or CT4 balance control to make a preamplifier with more features.
For detailed application information please see the RESOURCES below.


Gain (selectable):

0, 6 or 12 dB

Bandwidth (0dB gain):

25 MHz

Slew rate (0dB gain):

500 V/us

S/N ratio (IHF A):

112 dB

Channel matching:

+/-0.05 dB

Output resistance:



0.0002 %

Output voltage swing:

+/- 14 V

Output current, max.:

>25 mA

Supply voltage range:

+/-5 VDC to +/-100 VDC


If you want to view any of the resources below on your monitor, we recommend that you click on the HTML version of the resource.
For printing or filing, we recommend downloading the PDF version

CT101 Data Sheet
Click here for on-screen viewing
Click here to download PDF version (227KB)   Download the CT101 Line Stage data sheetDownload the CT101 Line Stage data sheet

CT101 Instruction Manual
Click here to download PDF version (341KB)
  Download the CT101 Line Stage instruction manual
Review of various DACT components in The Absolute Sound’

Click here for on-screen viewing
Click here to download PDF version (38KB)      DACT review in The Absolute Sound April/May 2001

Application Note:
Wiring diagram for building a full-featured preamplifier using CT101.
Click here for on-screen viewing

Application Note:
Using CT101 for building active 6- and 8-channel preamplifiers.
Click here for on-screen viewing

High Quality CT101 Photo:
Visit DACT’s Photo Gallery to view a high quality photo of CT101.


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