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Black Box Analog Design Preamp

Vacuum-tube microphone preamp

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Black Box Analog Design
Included with your purchase:
  • Free Shipping (USA)
  • Free Tech Support
  • Free Extended Warranty
Regular Price: $1,995.00
Save 10%: -$199.50
Sale Price: $1,795.50

Availability: Yes! It's in stock & ready to ship.

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The Black Box Analog Design Vacuum Tube Preamp is an entirely new approach to capturing audio. It is not based on any existing circuit but designed from the ground up, using the best parts and ignoring all of the standard ideas of how a preamp “should work”. The result is an incredibly versatile piece of gear that not only sounds amazing but shatters the idea of what a preamp can do!

Tonal Control
Until now, your preamp simply amplified the signal. You essentially get one sound and the ability turn it up or down. The Black Box mic pre on the other hand allows you to drastically shape the response curve of the unit without using any EQ and the associated phase shifts!

All of the shaping is done at the tubes and from the constantly variable interaction between stages allowing you to dial in virtually unlimited tonal possibilities. Essentially, you have the ability to have full control over how the microphone “hears”! You can find the sweet spot of any microphone and instrument easily and naturally!

The response curve of the Pentode stage alone gives you a huge amount of control over the tone. Coupled with the independently controlled Triode stage you have virtually unlimited tones at your fingertips.

All Tube, All Analog
Black Box Analog Design's entirely analog audio circuit uses only tubes for amplification and is entirely free of op amps, ICs and transistors!

The Pentode and Triode tube stages are the centerpiece of an entirely point to point, hand wired circuit built on copper boards. From precisely, hand matched resistors and capacitors to custom wound Cinemag transformers , every part is selected and built for the absolute highest quality sound.

Real Power
It seems that more and more manufacturers these days are moving to cheap, “wall wart” switching power supplies. Sure they are cheap but we all know that a piece of gear is only as good as its power supply! For that reason, our preamps use a massive toroidal to supply 350v of pure, linear power to get the most out of the tubes. Real power means real sound!


  • Independently controlled Pentode and Triode tube stages
  • Custom wound Cinemag input and output transformers
  • Entirely analog audio path (No ICs or Op amps)
  • Switchable input impedance done by tapping into the transformer windings
  • 5 position, gentle and musical roll off
  • Linear power supply
  • Passive output attenuation control
  • 48v Phantom power from an entirely separate supply
  • Real, amplifier isolated VU meters
  • Military spec switches
Condition New
Product Availability In stock
Tube or Solid State Tube
Channels Single-Channel
Chassis 19-in. Rackmount
Rack Spaces 3u
Direct Input Yes
Digital I/O No
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