X-12 Mic Preamp Kit

This is my own version of a classic preamp, popular in the 70s and still popular today. It's not a clone since I'm using a totally different signal path and design, and different input and output transformers. But the sound nevertheless is awesome. Big and beefy with lots of transformer mojo goodness.

Note: This kit is my 1u rack version with on-board local voltage regulators. For the 500-Series lunchbox version, click here. X-12mk500

• Using Made in USA, Input and Output Transformers
• 12-step Gain from 22dB to 68dB, at 4dB/step
• -20dB Input Pad
• High-quality parts
• Option to use Discrete OpAmps with the 990/2520 format
• Using high-performance chipsets, currently the best chip around
• Using High-speed 2000V/us, video buffer, high-current transformer line driver
• Using Grayhill switch - high quality mil-spec
• with output trim Bourns potentiometer - so you can overdrive the input trafo and be able to trim the output of the pre.
• Null offset trimmer adjustment
• LED-lighted push buttons for 48V phantom, pads, and polarity reverse
• Relay Controlled Polarity Reverse
• Relay Controlled -20dB Pad
• Soft-start/Ramp-up 48V Phantom Power
• Includes on-board voltage regulators
• Professional PCB, Rohs PCB with double-sided, plated-through holes, 2oz. copper
• with soldermask, silkscreen layout,
• Includes everything... 5-LED VU Meter, spacers, screws, knobs

Download X-12 Mic Preamp Assembly Guide
Don't forget to download too the VU Meter Assembly Guide

Click here for Audio Samples

Click here for X-12 Audio Samples

NOTE: The X-12 Preamp requires a Power Supply Unit.
You can use my PSU-24448mk2 and Power Transformer Kit.

You can use discrete opamps with these kits. Discrete opamps NOT provided with the basic kits.

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Ready-Made 1u Front Panel

Create a professional looking case for your DIY project. Get our ready-made Front Panel!

This 1u front panel is made from Anodized Black Aluminum, 0.125" thick. It has been pre-drilled using an accurate CNC machine, and there are pre-drilled holes for the gain, trim controls, push button switches, and for the 5-LED VU Meter.  Holes for the power switch and Panel LED lamp are also provided. This front panel is designed to work with Par-Metal.com 19" rack cases.

You'll also get (2) Front Panel transparent sticker/decals with easy to read white labels for your controls, knobs and switches. It's easy to apply: Just peel the sticker backsheet, align the sticker with the front panel holes, stick it on, and peel off the protective top sheet.

Note: For best results, wait 24-48 hours after application of decal/sticker for the decal to "cure" and completely "meld" with the aluminum front panel. Any "bubbles" or uneven-ness will disappear and the decal will adhere to the aluminum front panel very strongly. See additional photos below.

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