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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
  • The SL4K-G91 is a top-of-the-line preamp audio DIY kit that is perfect for those who want to recreate the classic sound of the 4000G Desk. This preamp is the older brother of the 9000J Preamp Design and features a preamp section based on the G291 schematics. It uses a super matched dual Transistor AS194H for the input signal, which is just as good as the original MAT02.

    The Preamp design itself is a Single Differential Gain Stage Design. The Design has a super matched Input, followed by a stepped Gain Pot. The Sound of this Preamp is really intense and has a decisive character for most productions. Due to the high quality Op Amps the Preamp achieves a clear frequency response. With its high-quality components and attention to detail, the SL4K-G91 is the perfect choice for those who want to build a high-quality preamp for their audio system.

    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.

    • Shipping will be calculated depending on your location
    • Standard Shipping with DHL
    • UPS Express Saver as Option in Checkout
    • 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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