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K&K Sound - Progression Twin Tube Acoustic Preamp

The Progression Preamp is build for the acoustic musician who seeks an undistorted tone with the warm and crisp sound only a true tube circuit can provide.

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€ 549.95 tax incl.

€ 599.00 tax incl.


The Progression Preamp is build for the acoustic musician who seeks an undistorted tone with the warm and crisp sound only a true tube circuit can provide. Unlike solid-state circuits, which tend to sound artificial if treble response is pushed,

Progression can add a special elegant “mic-like” high-end shimmer and the warmth only a high voltage tube circuit can produce.

The Twin Tube Progression preamp features:

  • Initial solid state stage with volume, gain, 3 band EQ and peak LED
  • Final tube stage with Twin 12AX7 in- and output tubes, gain and presence controls
  • Individual outputs for both stages
  • Phase shifting capability fully based within the tube circuitry
  • Two ¼” outputs and one balanced XLR out

Important General Information:
Tubes need a bit to warm up when switched on, it takes 20-30 seconds until you hear sound. Tubes, by nature, distort a lot sooner than transistors do. For undistorted tube-sound, Progression needs a higher amplifier-master-volume compared to a solid state preamp. Most amps easily provide this extra headroom. In order to provide the truest tube sound possible, we purposely feed Progression’s line output directly from the 12AX7 tubes without going through another solid state stage.

To achieve a clean tone, set Progression’s “TUBE STAGE GAIN” low
enough to NOT distort and turn the master volume on your amp or the channel-gain/volume on the mixing board a little higher.
If you hear a slight hum you may have created a “ground loop”. Use a 3- into 2-prong
(groundless) adapter on the 120 volt power plug of Progression’s gray power-supply cable.

The “Main IN” input utilizes both, Progression’s “Solid State” - and “Tube” stage. The two-stage design allows to perfectly pre-amplify and pre-EQ the signal of a transducer in the solid state stage and then feed the strong & noise-free signal into the tube circuit. This keeps the overall noise level low and permits us keeping the full frequency response throughout the entire tube stage without any limit in treble frequencies.
Progression’s Outputs:

  • For the true tube enthusiast, the “LINE OUT” output carries the Purest tube sound, because it feeds directly from the 12AX7 output tube.
  • The “XLR Out” uses one additional solid state OP-amp in order to provide the balanced signal output.
  • The “SOLID STATE OUT” feeds from the solid state preamp only and bypasses the tube stage. It does not use the phase switch and presence control. It provides higher headroom before distortion and super low noise level. It may be used in conjunction with small amps which simply do not provide enough power to utilize the tube stage. This output can also used as a tuner out.

What else?

Here you will find reviews and customer reviews directly on the manufacturers website. On request we can also provide a test of the "Akustik Gitarre" in German.

Click here to be a great help / FAQ file open (in English) about the K&K products.

Under the "Download" tab you will find the installation instructions in English.
We gladly provide you with a German installation instructions according to EU standard available.

Listen to sound samples on the manufacturer's website at.

On YouTube you can find more sound samples, and installation instructions .

K&K Pickups are RoHS compliant. Piezoceramic is officially excluded.In the manufacture of ceramics, lead is used as it unfortunately currently there is no functional substitute. The lead is incorporated in the ceramic, and is sealed on both sides by a silver electrode. The ceramics is mounted on a solid brass plate. From above it is provided with a plastic seal, so that the lead is so hermetically sealed completely and makes contact with the skin makes it impossible. Damage to the Pickup, because you could come in contact with lead. We are WEEE conform and wear exclusively for K&K products throughout Europe, the responsibility of WEEE.

  • Anschluss: Anschluss an einen Akustikgitarrenverstärker, Mischpult, Vorverstärker oder DI-Box.
  • Anschlusstyp: Klinke, 6,35 mm Stereo, Verdrahtung in Reihenfolge der Größe der Lötfahnen: Tonabnehmer / (optionaler) 2. Tonabnehmer / optionale Stromversorgung (nicht erforderlich) / Masse des Tonabnehmers
  • Equalizer: included, external
  • Impedanz: 10 kΩ (Line-Pegel)
  • Instrumente diverse, siehe Beschreibung
  • Mounting: external
  • Phase switch: included
  • Pickup type: 1 x Transducer
  • Power supply: AC adapter
  • Uprade: not available
  • Volume control: vorhanden, extern

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