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Korg Nutube B1 Full Kit

  • 2500


2019-12-27 update: Pioneer's batch 2 of completion kits is now available SOLD OUT. We have a limited number. You can read the overwhelmingly positive feedback here in the pioneer's batch feedback thread on diyAudio.

Once these sell out, 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 January about this.

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 14 reviews
Nutube B1 with Aleph J is Magic

What a wonderful sounding preamp. Build took me about 4 hours as someone with moderate experience with electronics and a soldering iron. This is now sitting in front of Aleph-J and I'm in love with the sound. Microphonics were a problem but not hard to tame following others recommendations. Now just to finish my new DIY speakers......

Great kit

I couldn't get over how EVERYTHING was in this kit. All quality parts. These guys know what they are doing trust me, cause I surely don't. I've never built anything electronic in my life. I'm the definition of beginner and I finished this amp in 3 days! It sounds amazing. Worth more than the price. I highly recommend this kit.


Kit arrived very well packaged . With help from the build thread it was a straight forward build. I placed a piece of carpet underlay felt under the Nutube and the silicone ear pieces from earbuds on each mounting post. It is hooked to a M2x and sounds very nice.

Korg Nutube Pioneer Kit

Paired with a brace of ACA my system has never produced cleaner clearer music. My much loved 30 year push pull triode valve amp will be put away in it's original packing bested by a Korg Nutube and single ended transistor power. The Korg buffer has been favourably reviewed by professional audio reviewers against other pre-amps costing more than 10 times as much, without hearing such things it's hard to argue. I just need to build a phono stage to plug in to it now.

The Wall wart power supply that requires a travel adapter is a big disappointment - given a choice I'd opt for brick with a choice of international plugs (or a plug I can cut off and replace). Alps volume pot keeps the cost down but there are better sounding options when you are ready for not too much more- TKD, Tocos Cosmos etc. I built mine in Galaxy 2 U case so that I could mount the Korg vertically in full view and get more inputs into the back of the case with an elma switch and match the silver ACA cases I already have.

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.

Great kit

I liked this pre-amp so much, I bought and built a second one for my main stereo.

The parts are high quality, and packaged really well. The kit shipped promptly.

Really, I have nothing but praise for this project. It's awesome!

Great pre amp

This went together without any issues. Fantastic sounding unit without any of the ringing people are talking about. highly recommended. I really like the enclosure and the clean look. Same width as the amp camp amp. Could not be happier with the product.

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