Korg Nutube and GSP

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Korg Nutube and GSP

Postby kheper » Thu Jan 04, 2018 1:39 pm

Has anyone used this new offering - an audio tube based on fluorescent display tube technology? It looks rather like a directly heated twin triode. The datasheet is available, but there's no direct URL link to it.

http://korgnutube.com

https://www.youtube.com/watch?v=6Azl1vzoLpA

There are serious rumors that GSP on Ebay is holding-up and not delivering vacuum tubes, shipped internationally. Tubes are now marked as "restricted items". There's some debate as to why they are restricted: environmental regulations, etc. The beginning of the end?

https://community.ebay.com/t5/Shipping- ... p/27010523
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Re: Korg Nutube and GSP

Postby Geek » Fri Jan 05, 2018 12:57 am

That tube has been rediscovered many times lately. Are they re-marketing it?
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Re: Korg Nutube and GSP

Postby kheper » Sat Jan 06, 2018 3:08 pm

From what I can tell, guitar effects manufacturers have been - recently - rolling-out distortion pedals, based on the NuTube. The tube may have found a niche. In the past, I believe that fuzz boxes relied solely on overloading diodes, leds or nand gates to provide the harmonic (and other) distortion.

https://reverb.com/news/ibanez-to-launc ... r-for-2018

The pedal incorporates Korg's NuTube technology—also found in amps like the Vox MV50—to add another tube-like sonic dimension to the stalwart overdrive circuit.
Last edited by kheper on Sun Jan 07, 2018 8:11 am, edited 1 time in total.
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Re: Korg Nutube and GSP

Postby Geek » Sun Jan 07, 2018 12:51 am

They overlooked peanut tubes?

Looking at the NuTube's spec, it's on par with some *shrug*
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Re: Korg Nutube and GSP

Postby kheper » Sun Jan 07, 2018 8:10 am

Yeah. There are a few distortion boxes in the following link which employ tubes - 12AX7 in one of them.

http://blog.thetubestore.com/tube-pedals/

Most of the OD pedals out there are solid state devices that use clipping diodes or cascading gain through multiple transistor stages. There are, however, an increasing number of overdrive and distortion pedals using vacuum tubes in the signal path.


The tube pedal is often just a marketing gimmick because pedal manufacturers know that if they drop a tube in there, we are all going to go ga-ga and buy the shiny new tube box.
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Re: Korg Nutube and GSP

Postby Geek » Sun Jan 07, 2018 9:34 am

Hahaha, that's about right :))

I had a dear friend (RIP) who got some fame fom a tube stomp project:
http://www.dogstar.dantimax.dk/tubestuf/mctube.htm

He did a HV supply for it and I know of at least one person who ditched the first transformer, used a 9V:120V, strung the tube heaters parrallel adding a dropping resistor and voila! A McTube powered from the 9VAC stomp panel (y)
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Re: Korg Nutube and GSP

Postby Poppa Fuse » Sun Jan 21, 2018 9:00 am

I have not tried the Korg NuTube. But I have cloned several designs by Pete Millett, which I found to be well engineered. He has become an "authorized, independent distributor of the Korg Nutube." You might enjoy his website. http://www.pmillett.com/ He uses ebay to sell things but ships from Texas. http://www.nutube.us/
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Re: Korg Nutube and GSP

Postby kheper » Tue Feb 20, 2018 12:21 pm

In the link is a video - in which a YouTuber receives 4 Nutubes and an evaluation board from Korg. He does a microphonics test.

https://www.youtube.com/watch?v=raYGrKWSKRE
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Re: Korg Nutube and GSP

Postby Jeffytube » Wed Mar 07, 2018 8:36 pm

I've built the Nutube Hybrid Headphone Amp, the board is designed and produced by Pete Millet. Its has a very nice sound and very quiet, and I do prefer the sound of the Nutube to the high mu 12ax7 or 6dj8. I also built the Nutube buffer amp but have not had a chance to power it up to evaluate. The boards by Pete Millet are nice but very cramp and components are small, and hard to read the polarity of capacitors. I had to use a magnifying glass for soldering the components.
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Re: Korg Nutube and GSP

Postby Geek » Thu Mar 08, 2018 2:41 am

Yep, one of these are indispensible ;)
You guys in the US have Harbour Freight... should be about $8-10
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