SC-1mk3 Mic Preamp

3rd Generation! SC-1mk3 Mic Preamp Kit

The SC-1mk3 Mic Preamp is a clean, "fast", clear, low-noise, high-gain preamp. It's sound is very transparent, offering a flat response, smooth highs and well-defined mids.


None – this feature was introduced in the original SC-1 preamp (mk1 version)
mk2 – this feature was first introduced in the SC-1mk2 version, and also available in the mk3 version
mk3 – this feature is new for the SC-1mk3 version

  • Low-Noise, High-Quality Mic Preamp
  • All solid-state design, using chipsets from THAT Corp and Burr-Brown
  • Soft-start, slow ramp-on +48V phantom power
  • mk2: Option to use input transformer for added sound “flavor”
  • mk2: Gain range from +12 to +72dB, in 6dB increments from +12db to +42dB; 4dB increments from 46dB to 72dB.
  • mk2: Onboard Power Supply Regulation, adjustable +/- voltage rails
  • mk2: Reduced clicking and popping when changing gains
  • mk3: Further reduced clicking and popping when changing gains
  • mk3: Robust 48Volt short circuit protection (from accidental phantom power shorts)
  • mk3: LED-lighted push buttons for phantom power, -20dB pad and polarity reverse
  • mk3: VU Meter, 5-LED bargraph
  • mk3: Relay controlled Pads
  • mk3: Relay controlled Polarity Reverse
  • mk3: Bigger PCB area, more room to work with
  • mk3: Hole locations compatible with our X-12 Mic Preamp. (Now you can have (1) X-12 Mic Preamp and (1) SC-1mk3 Mic Preamp in the same 1u Rack Case)
  • Electronically balanced input and output stages with option to use Input Transformer
  • 12-position Grayhill gain selector switch
  • Input RFI protection
  • Input clamping protection
  • Output surge protection circuit
  • Output RFI protection
  • High quality Bourns, sealed, conductive plastic potentiometer for volume control
  • Gold-plated, machined, low-profile IC sockets
  • Use of high quality 1% Metal Film resistors, and high-quality ceramic and electrolytic capacitors
  • Solder pads for optional INSERT jacks
  • On-board jumper terminals
  • Easy to assemble, easy to troubleshoot design
  • Thick PCB board with 2oz. copper
  • Very affordable!!! This is quality product that is reasonably affordable! (i.e. because there are no middlemen, and we don’t do expensive glossy magazine advertising! )

Download PDF file of Assembly Guide/Kit Instructions

Click here to Order SC-1 Mic Preamp Kits!

Audio Samples

Listen to SC-1 Audio/Demo Sound clips

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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 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.


Click here to order 1u Ready Made Front Panel!


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