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JT Amplification Alpha Direct Box Tube D.I.

Desktop DI box with true high voltage circuit vacuum tube design, USA-made Cinemag output transformer, and lightweight aluminum chassis

MFR# Alpha Direct Box

Product Description

One of the most emulated components in digital recording products are tube-based products. Why? Tubes deliver a wonderfully warm signal rich with even harmonics and slight natural compression. The JT Amplificaton Alpha Direct Box has a similar signal path as a musical instrument tube amplifier: An adjustable tube preamp section. A tube output section and a big ol' output transformer

The Alpha Direct Box delivers what you need. Amazing warm tone. The R&D Process: With valuable and appreciated guidance from Producer & Studio Engineer Extraordinaire “Evil” Joe Barresi, the Alpha Direct Box went from a text message, to a hand-drawn schematic, to reality. The Alpha Direct Box is built in limited production runs in Los Angeles, CA.


  • Custom lightweight aluminum chassis
  • Vacuum tube design (true high voltage circuit)
  • Cinemag output transformer (USA-made)
  • Rotary gain control
  • Input pad switch
  • ¼” throughput jack
  • 2x 3-position voicing switches with an amazing sounding Flat mode (center position) and switchable voicings - Deep, Dark, Bright, Mid
  • Balanced XLR output connector (with +4, -10 switchable and ground lift switch)
  • Line out ¼” output jack
  • 2 x 12AX7 tubes (or 12AT7 in V1 only for pre gain reduction)
  • Includes external power supply (all world voltage)
  • Pedalboard friendly
  • Frequency response 16 Hz to 20 kHz distortion THD >0.09 @1 kHz

Product Specifications

Condition New
Width 6.2 in
Height 3 in
Depth 7.5 in
Unit Weight 4 lb
Chassis Desktop
Tube or Solid State Tube
Input Connectors 1/4-inch TRS
Output Connectors 1/4-inch TRS, Analog XLR

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I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
Matthew R.
I had two Grammy wins this year - Ray LaMontagne & Carolina Chocolate Drops. Both made with help from Vintage King!
Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
Phil T.
The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
James P.
Thank you so much! Vintage King has been so fair and easy to work with. I can't thank you enough. It feels good to trust such a hefty purchase to folks who are so helpful and knowledgeable. Vintage King is a sound designers dream store.
Noa L.
You guys have excellent customer service and I am excited about the next upgrade I complete on my fifth recording facility. I've been in the studio business for forty plus years. The salesman I worked with at Vintage King was the best of the best. You all rock!
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Jake D.
My experience with Vintage King was excellent. The order was here fast considering it was out of stock. The sales person had SKB send it to me directly and I couldn't have been more pleased.
Michael D.
From the minute I placed my order I was kept well-informed through each step in your process. Even though I was buying a comparatively modest piece of gear, your attention to detail made me feel like I was purchasing a six-figure mixing desk.
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I am a new customer of yours. You guys provided me the absolute best deals in ordering all the equipment to power my brand new recording studio. Your customer service is amazing and i will always deal with you from here on out.
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