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Korg Nutube B1 Full Kit

  • 2500


Pioneer's batch of completion kits has SOLD OUT. You can read the overwhelmingly positive feedback here in the pioneer's batch feedback thread on diyAudio.

The next step will be a pre-order available to everyone who is subscribed to the "Email Me When Available" full kit notification list. We expect to send an email in late October.

At Burning Amp Festival 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". 

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 5 reviews
Korg Nutube B1

sourced chassis, Nutube, Board and FETS from DIYAudiostore
used Dale resistors, Nichicon KZ and Elna caps, Alp pot,, the sound, no cursing but its you know great. very great looking and pro with the chassis and can't believe the size. Does ring on input change but stops. Much Improved when hot glued Nutube to board. Value/price can't be beat. Using with DIYAudio F5 also built this year. Loving both. Much gratitude guys and thank God for NP

Love the B1 with Korg NuTube Pioneer Kit

I purchased the B1 with Korg NuTube PCB and triode last year and waited patiently for the chassis kit to be released. Surprisingly, Jason and Jim also released a Completion Kit, which eliminated my need to acquire the caps, resistors, and diode to complete the PCB. I’m glad I waited as this kit was easy to assemble with Jim’s (6L6) photos and advice. I still have to work to reduce/eliminate the NuTube microphony that flares up occasionally, but this is a special line stage preamp with incredible detail, separation, a large and deep soundstage with excellent imaging, and organic tonality. This is a bargain and will best many vacuum tube line stage amp kits currently on the market at a lower cost.

Korg Nutube Pioneer Kit

As described, all good and easy to assemble. I set it to 9.5V. Would like to try to install better caps, silver wire and better volume pot.

I will be soon able to compare it to my Pass HPA-1 paired with FW SIT-3

Excellent sounding preamp

I thought this kit was easy to build, looks nice, and sounds great. It sounds as good as or better than some very expensive preamps, as long as I am not feeding amps with extremely low input impedance.

My only negative comment is that flipping the input toggle switch will initiate about 5 seconds of microphonics in the nutube. It would be nice if some manner of taming the microphonics were included in the kit.

My lasting impression is that this is the best bang for the buck I've ever encountered in an audio component.

Korg b1

The kit was the easiest yet to build . Very happy with the results. May mod in future, but good for now!

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