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Gain - 26-68 dB Gain Stepped recallable with Grayhill Switch
48V - For Phantom Power Microphones
Pol - Switches the Polarity of the Input
Pad - Enables - 20dB Pad at the Input
Low-Cut filter - 10-250 Hz (24dB/oct)
High-Cut filter - 3.5-20 kHz (24dB/oct)
Colour Module (DIYRE) - to add coloration
Output Fader -  -∞ to +12dB after Preamp
Level Meter - internal switchable After Fader or After Preamp
Peak Led - After Preamp
High quality pots (TT Electronics and Alps Alpine)
Balanced THAT1646 Output
AS194H Super Matched Transistors

Its running on +16V/-16V/+48V in the 500 API/ VPR Rack
or in the GDIY 51X Rack

More Pictures and Build Thread
GroupDIY Help Thread

Here are some listening samples
Soundcloud SL Preamp Comparison

Build Docs Also check our New LED Meter Board and advanced Calibration

All our Build Guides


Excluding Sales Tax
  • This Preamp is a recreation of a Classic Preamp design used in a 4000E Desk. The preamp section is based on the E149 schematics. This Preamp design was supposed to be the transformerless version of the E01 Preamp. So this Preamp was intended to mimic a transformer behaviour. This Preamp uses two super matched dual Transistors AS194H for the Input Signal. In the Original there were two MAT02 used, since the specs of the AS194H are totally close to that Original Part we use this Transistor without any difference in Sound. The Preamp design itself is a mixture of Discrete Input and Op Amp Gain Stages. In the Original both Stages are controlled by a dual Pot, we changed to a stepped Gain Pot for more accuracy and recallability. The Design has a super matched Input and since there are more discrete Transistors working for the sound the preamp adds more grit and space to the signal. The Sound of this Preamp is really powerful and has a dynamic character that mimics a transformer and makes it versatile for most productions. Due to the high quality Op Amps the Preamp achieves also a clear frequency response.

    The Addons of this Preamp are Peak LED and a full Meter, which can be selected Pre or Post Fader. The Fader at the End of the Preamp module gives the most flexible options to make this Preamp use in different situations. In that combination of Preamp and Fader there are already a lot of possibilities for sound colouration with the Preamp. In addition we added a variable Low and High Cut Filter, to clean up the Signal before recorded and DIYRE compatible Colour Modul Option to add another Colour to this preamp.

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    • Free Standard Shipping in Europe on orders over 100€

    Return of untouched Original Products is possible during a time of 14 days after receiving your article, check our Return Policy

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