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Korg Nutube B1 Full Kit

  • 2500


Korg Nutube B1 (also known as B1K) pre-order is now open!

Following great feedback about our "pioneer" batch of kits and chassis, we are now finally opening pre-orders for the production run of Korg Nutube B1 full kits.

A detailed build guide from 6L6 will be ready before shipping. A pre-order-only silver faceplate option will be available for purchase only while the pre-order is open. The build guide is now available at B1K Build Guide.

Korg Nutube B1 Pre-Order Key Dates

  • Pre-orders open April 20th 2020
  • Pre-orders close April 27th 2020, or earlier if we reach our production limit
  • Shipping will occur once production is complete (current estimate is sometime late Q3, 2020, see the B1K pre-order status page for details)

For answers to the following questions and more please see the B1K Pre-Order Status Page:

  • General information about diyAudio Store pre-orders
  • Opening, closing and shipping dates
  • Cancellations and refunds
  • What happens if you miss out
  • Can I change my shipping address?
  • Risks and challenges statement

Discussion threads / Links:


At the Burning Amp Festival in 2017 Nelson presented a pre-amp using the Korg Nutube dual triode. The latest revision of the circuit available is now available complete with Fairchild JFETs and all directly supplied by Nelson Pass. 

Please check the following links for more information:

There are 4 elements to building a complete preamplifier. Purchase the elements separately, or all together as a "full kit" bundle for $299. To build a complete preamplifier you will need:

  1. Nutube ($49.99)
  2. PCB + JFETs ($25)
  3. Chassis ($129)
  4. Completion Kit ($99)

What's in the completion kit?

Everything else you need to complete the project other than 1, 2 and 3 above. It's an assortment of bits and pieces that joins the Nutube, PCB and Chassis together, turning the whole things into a "full kit", hence the name "completion kit". 

The included "wall wart" style power adapter supports an input voltage of 90-264V and has a US style plug. If you don't live in the US you will need to obtain a suitable plug adapter.

What are the chassis specifications?

  • Galaxy 230x170 full aluminum chassis, anodized black with white printing
  • Internal dimensions 40x210x170mm
  • LED hole ø2mm
  • Left switch
    • Hole ø6.5mm
    • 15mm x 15mm square rear recess, 7mm deep
  • Right switch
    • Hole ø6.5mm
    • 15mm x 24mm rectangular rear recess (allows for switch and LED), 7mm deep
  • Potentiometer hole ø10mm, with ø32mm round recess in the front ø8mm deep
  • Rear RCA holes ø10mm
  • Rear power switch hole ø11mm

Customer Reviews

Based on 31 reviews
No Problems
Great sound
Great kit to follow an ACA build
Just great
Clean sound, with a hint of flavor
B1 Korg Exelent quality
Nutube B1 with Aleph J is Magic
Great kit

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