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Korg NuTube is now available online
Korg NuTube is now available online
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Old 15th January 2017, 01:11 AM   #1
pmillett is offline pmillett  United States
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Default Korg NuTube is now available online

I am now distributing the Korg NuTube 6P1 to DIYers, experimenters, and small OEMs.

For those of you that haven't heard of it, the NuTube is a newly developed, low voltage tube. It is a dual directly-heated triode. It is a very low power device, consuming only milliwatts of power.

You can get more information about the 6P1, including the full datasheet, at NuTube.US.

Also available is an evaluation board and other hardware to make using the 6P1 a little easier. These are also described on NuTube.US.

Sales will be done through an eBay store: NuTube.US Store | eBay Stores. Please be patient, it seems eBay takes some time to propagate the listings so that they show up in the store and in searches.

Thanks!

Pete
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Old 15th January 2017, 09:22 AM   #2
sharpi31 is offline sharpi31  United Kingdom
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Korg NuTube is now available online
I'm really interested to see what the tube experts make of this.
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Old 15th January 2017, 09:12 PM   #3
Koifarm is offline Koifarm  Netherlands
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Just ordered 2 at your store.
Waited almost a year but do not get the tubes from Japan.

Ronny.
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Old 16th January 2017, 02:35 PM   #4
pmillett is offline pmillett  United States
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Default eBay is still indexing...

eBay is taking forever to get these items properly indexed.

In the mean time, you can directly access the listings:

Korg NuTube 6P1 - low-power triode vacuum tube | eBay

Bare carrier PC board for Korg NuTube 6P1 | eBay

Evaluation board for Korg NuTube 6P1 | eBay

Assembled carrier board for Korg NuTube 6P1 | eBay
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Old 17th January 2017, 05:08 PM   #5
vanofmonks is offline vanofmonks  United States
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So, any chance of a redesign of the LR phono stage with these?
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Old 17th January 2017, 09:04 PM   #6
rickmcinnis is offline rickmcinnis  United States
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Looking at the data sheet I think this thing is intended to be a "tone" generator.

I wonder if it is even capable of driving a circuit on its own?

They show a sample circuit with a single FET input and output and this tube PARALLELED in between.

Novel and interesting; they look to be useless for the home audio market and at the price an expensive novelty at that.

As usual I would welcome being proved wrong.
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Old 19th January 2017, 01:33 AM   #7
pmillett is offline pmillett  United States
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Quote:
Originally Posted by rickmcinnis View Post
Looking at the data sheet I think this thing is intended to be a "tone" generator.

I wonder if it is even capable of driving a circuit on its own?

They show a sample circuit with a single FET input and output and this tube PARALLELED in between.

Novel and interesting; they look to be useless for the home audio market and at the price an expensive novelty at that.

As usual I would welcome being proved wrong.
I guess one could make exactly the same comments about a 300B tube...

I do view it as a "signal processing element" more than an amplifier. It has pretty low gm. If your goal is a low distortion amplifier, regular tubes and opamps are far better.

Korg's main application for this is musical instruments, not hi-fi.

That said... I have built both a headphone amp and a class-D hybrid amp using this device. In both cases they are set up to ADD some even order distortion to what would otherwise be a very low distortion amplifier - essentially to make a solid state amp sound like a single-ended tube amp, without high voltage supplies.

Whether this is a good thing or bad thing is up too the listener - I won't debate it. But why would somebody want to listen to a single-ended 845 amp when they could listen to a class-D amp that has far better specs at 1/10 the cost?

Pete
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Old 19th January 2017, 01:35 AM   #8
pmillett is offline pmillett  United States
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Quote:
Originally Posted by vanofmonks View Post
So, any chance of a redesign of the LR phono stage with these?
Nope. The gm is too low, so it generates too much noise for a phono preamp.

As much as the tube purists will disagree, for me, sometimes, opamps are best...

Pete
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Old 25th January 2017, 10:41 AM   #9
EUVL is offline EUVL  Europe
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Any information on device to device variations ?


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Old 25th January 2017, 04:11 PM   #10
pmillett is offline pmillett  United States
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I have not seen data from Korg on it yet. My experience so far with about 20 headphone amplifiers has been that they are pretty close unit to unit. I am using fixed bias.

I did allow for gain adjustment, mostly to make sure that the channels were matched. Without adjustment they were within a dB or so.

Pete
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