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Old 25th January 2017, 05:54 PM   #11
EUVL is offline EUVL  Europe
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So you already have a demo circuit ?


Patrick
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Old 25th January 2017, 07:27 PM   #12
pmillett is offline pmillett  United States
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Quote:
Originally Posted by EUVL View Post
So you already have a demo circuit ?


Patrick
Yes, a couple of things. I am building a commercial headphone amp that uses the Nutube: The Sangaku

I also designed and built a hybrid class_D amp (Nutube driving class D) as an experiment. I haven't published anything on that yet.

And, I am selling an evaluation board through the website (NuTube.) You can see it (and download the details) halfway down the page.

Pete
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Old 3rd February 2017, 11:10 PM   #13
Soundhappy is offline Soundhappy  France
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What about Nutube microphonic ?
I see case made for this purpose.
Sound is much better with ?
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Old 4th February 2017, 01:05 AM   #14
pmillett is offline pmillett  United States
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The Nutube is definitely a bit microphonic. Korg has experimented with several ways to try and mechanically isolate the tube from the PCB, including connecting it with thin wires and mounting it with a rubber sponge.

I have not seen the case that you showed, so I'm not sure how it works.

In the headphone amp I designed, I did not isolate it from the PCB. You can certainly hear a noise if you tap the PCB, but I don't think it is excessive.

If you were going to use the Nutube in a low level signal application (like a microphone or phono preamp) you would probably need to address it.

Pete
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Old 4th February 2017, 01:54 AM   #15
Soundhappy is offline Soundhappy  France
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Originally Posted by pmillett View Post
....I have not seen the case that you showed, so I'm not sure how it works.....

Pete
Hello Pete

On official Korg Nutube site they write about adaptors for minimise microphonics probably available in the near future.
This ones show on the photos are small run no official version ready we can buy on the market in Japan.
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Christophe
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Old 4th February 2017, 02:25 AM   #16
Soundhappy is offline Soundhappy  France
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Ah yes...
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Old 11th February 2017, 08:18 PM   #17
Koifarm is offline Koifarm  Netherlands
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Pete,

i received the tubes in good condition,thanks.

Now my plans and if anyone like to ad some ideas, please do.
My son is a DJ here in the Netherlands and he use a 6n16 tube buffer between his mixer and the active filtering for the main speaker amps for years now. We did various testing with and without the tube buffer but almost every body liked the music with the tubebuffer. The 6n16 buffer is a very clean buffer with about max 0,1% distortion.

Now i like to build something like that with the 6p1.

Mixer output is 1Vrms asymmetrical. I will lower that signal with resistor devider to 40mV and use this as input for 6P1. The 6P1 amplifies 5 times at 12V anode supply. This 200mV output i send to a lm4562 opamp with lme49600 buffer (like the wire design ) with 20 times amplification. Now i have 4Vrms signaal strong enough to drive long cables on stage. Playing with the bias give me the possibillitie for searching best operating point.

The above setup works also great for headphone amp design.

Last edited by Koifarm; 11th February 2017 at 08:23 PM.
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Old 13th February 2017, 09:06 PM   #18
pmillett is offline pmillett  United States
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Yes, this should work fine. You can experiment with the bias and plate load resistor on the 6P1, and also try changing the input attenuator and output gain of the opamp stage.

I'm thinking one could use a dual linear taper pot and connect one channel as the input attenuator, and the other as the opamp gain (but connected "backwards"), and have one single "distortion" control? I need to try that...

Pete
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Old 15th February 2017, 06:02 PM   #19
Koifarm is offline Koifarm  Netherlands
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Today i draw the PCB for my 6P1 Harmonizer.
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Old 16th February 2017, 03:17 PM   #20
pmillett is offline pmillett  United States
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Today i draw the PCB for my 6P1 Harmonizer.
Looks good! I'm anxious to hear how it works, and sounds...

Pete
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