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Input Transformer 1:7 Input Transformer Turn Ratio

Options with same footprints (CAPI EA2622, CAPI CA2622, AVD Audio 2622, Cinemag CMMI-8-PCA, UTM2522, Link Audio LA2622)

Balanced Transformer Output based on a 2503 Transformer (CAPI EA2503, AVD Audio 2503, UTM3503, Cinemag CMOQ-2S, Link Audio LA2503)

DOA Sockets - Add your favourite DOA to this Preamp
Gain - 26-60 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
T-Pad Output Attentuator Fader -  -∞ to +0dB after Preamp
Level Meter and Peak Led - after Preamp
High quality conductive plastic pots


Kits are avaivable with (LA2622 and LA2503) or without transformers.
DOA of your own choice ( NOT INCLUDED IN THE KIT)

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

Here are some listening samples
Soundcloud PI Comparison Test

Build Docs
All our Build Guides


PriceFrom €297.55
Excluding Sales Tax
  • The PI312 is a high-quality preamp that recreates the classic design of a 312 preamp. It uses a 1:7 transformer for a balanced input signal, ensuring that your audio is clean and clear. The preamp design features one op amp for gain, and you can add your DOA of choice (not included in the kit) for even more customization. Thanks to the input transformer, the PI312 has a unique character that sets it apart from other preamps on the market.

    The Sound of the preamp is definite and has a rough nature in Sound that works definitely in every music production. Instead of a Gain pot we are using a stepped Grayhill Switch and make this Preamp full recallable.

    The Addons of this Preamp are Peak LED and a full Meter. The Output Attentuator 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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