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D2O is a low noise discrete microphone preamp, it is a further development of the famous German V series preamps of the 40's and 50's, widely recognized as one of the best sounding preamps.

General layout
D2O's general layout consists of a Lundahl 1571 input transformer followed by 2 single ended gain stages. The second gain stage can be selected to be either a high gain Fet or a Tube stage. when the high gain, all Fet circuit is engaged D2O becomes an ideal companion for microphones with a relatively low output like ribbon microphones. With the hybrid Fet/Tube circuit is engaged the sonic benefits of having a tube in the signal path can be utilized. Output drive is supplied by a discrete low impedance Fet buffer with superb sonic properties. Quality Paper in oil coupling capacitors are used, all other used components are high-end grade aswell.

Low noise / low esr power supply
In single ended preamp designs the quality of the power supply is crucial, D2O is fitted with a discrete low esr voltage regulator built with low noise components enabling optimal performance to the amplifier circuit.

switchable transformer ratio / input impedance
By selecting the transformer ratio switch a selection between a 1:1.75 (LO) or 1:3.5 (HI) transformation ratio can be made. Besides setting voltage gain, this also switches the input impedance of the amplifier between 2.25KOhm and 6.25 KOhm. Different transformation rate and impedance selection options are very desirable as they allow for more sonic options from the connected microphone.

selectable all Fet or Tube-Fet circuit
The Tube-Fet switch determines whether D2O functions as an hi gain, all Fet or hybrid Tube-Fet circuit, each with its unique sonic character.

Gain D2O all Fet: 70 dB
Gain D2O Tube/Fet: 60 dB
EIN: -128dB
Headroom: 32 dB
Input impedance: 2,25 KOhm / 6.25K Ohm
Output impedance: 100 Ohm
Power supply: 24V AC
Input: XLR
Output: XLR / 1/4" jack
Stepped attenuator
Phase reverse switch

Triton Audio D2O 500 series

  • This is a really nice mic pre to pair with Feather ribbon mics. Lots of headroom, with switchable input impedance and the ability to select the last stage as FET or sub-miniature tube. Overall, the sound is fairly warm with silky highs that really work with the extended frequency range of Feather Mics; a bit warmer with the tube stage selected. I prefer the D2o to other mic preamps aimed at ribbon microphones. The single gain knob gives a very usable output on an acoustic guitar with our mics at the second detent (2) out of 10. Please feel free to email any questions to

    I liked it so much, I became a dealer!

FEATHER Microphones

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