SM Pro Audio Tubebox - 500 Series Class A Tube Preamplifier

Description

This is the SM Pro Audio Tubebox Tube Preamplifier,  It has a great built in compressor.  You can turn the tube off or on as is needed.  Check the review below!  These modules work in the API Lunchbox unit and others.
Internet Review
TubeBox Preamp
My initial tinker was with the TubeBox. This is a transformerless Class A mic pre design with a 12AX7 tube circuit and LME 49720 low distortion/low noise op amps. Input gain and output level controls are available, as are 48V power and a phase reversal switch. There’s a -20dB pad switch and low cut filter — all the necessities of a completely equipped mic preamp. One small caveat is you’ll need an adaptor cable to plug a mic straight into the front of the unit as this is a TRS jack input — hey, space is at a premium with 500 series units.
The unit also features a well specified compressor with release, attack, and compression ratio controls which is quite a capable dynamics tool. Being an optical compressor it’s easy to pull an LA2A-style squash from it. Interestingly, in the good ol’ USA style, switches activate in their upward positions. When the compression circuit is switched in the extremely brightly backlit (perhaps terrawatt and nuclear powered) VU meter swaps from representing input level to gain reduction. But overall, it’s a smooth-sounding preamp and quite a tidy compressor.
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