Groups > sci.electronics.design > #461828 > unrolled thread

6P1 "NuTube"

Started by	bitrex <bitrex@de.lete.earthlink.net>
First post	2017-05-26 12:45 -0400
Last post	2017-05-27 08:15 -0700
Articles	20 on this page of 37 — 12 participants

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  6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-26 12:45 -0400
    Re: 6P1 "NuTube" John Larkin <jjlarkin@highland_snip_technology.com> - 2017-05-26 10:24 -0700
      Re: 6P1 "NuTube" pcdhobbs@gmail.com - 2017-05-26 10:37 -0700
        Re: 6P1 "NuTube" Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-05-26 10:42 -0700
        Re: 6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-26 14:09 -0400
      Re: 6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-26 14:02 -0400
      Re: 6P1 "NuTube" tabbypurr@gmail.com - 2017-05-26 13:20 -0700
    Re: 6P1 "NuTube" Winfield Hill <hill@rowland.harvard.edu> - 2017-05-26 12:16 -0700
      Re: 6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-26 15:53 -0400
      Re: 6P1 "NuTube" John Larkin <jjlarkin@highland_snip_technology.com> - 2017-05-26 12:59 -0700
        Re: 6P1 "NuTube" tabbypurr@gmail.com - 2017-05-26 13:34 -0700
          Re: 6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-26 17:49 -0400
            Re: 6P1 "NuTube" John Larkin <jjlarkin@highland_snip_technology.com> - 2017-05-26 14:58 -0700
              Re: 6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-26 18:13 -0400
                Re: 6P1 "NuTube" tabbypurr@gmail.com - 2017-05-26 17:28 -0700
            Re: 6P1 "NuTube" tabbypurr@gmail.com - 2017-05-26 17:24 -0700
          Re: 6P1 "NuTube" Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-27 07:06 +0000
        Re: 6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-26 16:47 -0400
          Re: 6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-26 17:03 -0400
          Re: 6P1 "NuTube" Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-05-26 14:10 -0700
            Re: 6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-26 17:25 -0400
            Re: 6P1 "NuTube" Bill Martin <wwm@wwmartin.net> - 2017-05-26 18:50 -0700
              Re: 6P1 "NuTube" Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-05-27 04:44 -0700
                Re: 6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-27 07:54 -0400
          Re: 6P1 "NuTube" John Larkin <jjlarkin@highland_snip_technology.com> - 2017-05-26 14:50 -0700
            Re: 6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-26 18:00 -0400
            Re: 6P1 "NuTube" tabbypurr@gmail.com - 2017-05-26 17:26 -0700
              Re: 6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-26 20:30 -0400
                Re: 6P1 "NuTube" tabbypurr@gmail.com - 2017-05-27 05:24 -0700
                  Re: 6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-27 08:39 -0400
                    Re: 6P1 "NuTube" Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-05-27 05:44 -0700
    Re: 6P1 "NuTube" whit3rd <whit3rd@gmail.com> - 2017-05-26 15:18 -0700
      Re: 6P1 "NuTube" bitrex <bitrex@de.lete.earthlink.net> - 2017-05-26 19:27 -0400
        Re: 6P1 "NuTube" tabbypurr@gmail.com - 2017-05-26 17:37 -0700
      Re: 6P1 "NuTube" tabbypurr@gmail.com - 2017-05-26 17:34 -0700
    Re: 6P1 "NuTube" Boris Mohar <borism_void_@sympatico.ca> - 2017-05-27 08:21 -0400
      Re: 6P1 "NuTube" John Larkin <jjlarkin@highlandtechnology.com> - 2017-05-27 08:15 -0700

Page 1 of 2 [1] 2 Next page →

#461828 — 6P1 "NuTube"

From	bitrex <bitrex@de.lete.earthlink.net>
Date	2017-05-26 12:45 -0400
Subject	6P1 "NuTube"
Message-ID	<RYYVA.239665$rp2.79739@fx31.iad>

New-manufacture dual triode vacuum tube made in a VFD factory, looks like:

<http://www.ebay.com/itm/Korg-NuTube-6P1-low-power-triode-vacuum-tube-/222378278144?ssPageName=STRK:MESE:IT&afsrc=1&rmvSB=true>

Here's the datasheet:

<http://www.nutube.us/downloads/Nutube_Datasheet_31.pdf>

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#461839

From	John Larkin <jjlarkin@highland_snip_technology.com>
Date	2017-05-26 10:24 -0700
Message-ID	<asogicli72kluihks2j2gtbaromc9evl0j@4ax.com>
In reply to	#461828

On Fri, 26 May 2017 12:45:36 -0400, bitrex
<bitrex@de.lete.earthlink.net> wrote:

>New-manufacture dual triode vacuum tube made in a VFD factory, looks like:
>
><http://www.ebay.com/itm/Korg-NuTube-6P1-low-power-triode-vacuum-tube-/222378278144?ssPageName=STRK:MESE:IT&afsrc=1&rmvSB=true>
>
>Here's the datasheet:
>
><http://www.nutube.us/downloads/Nutube_Datasheet_31.pdf>

Somewone here (me, actually) once conjectured about using a VF display
as a gain element.

Terrible as a tube, especially for $50. Probably a good 60 Hz magnetic
field sensor.


-- 

John Larkin         Highland Technology, Inc
picosecond timing   precision measurement 

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

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#461841

From	pcdhobbs@gmail.com
Date	2017-05-26 10:37 -0700
Message-ID	<1a7a2b10-1080-46fd-9edc-bf1240f386e0@googlegroups.com>
In reply to	#461839

>Someone here (me, actually) once conjectured about using a VF display 
>as a gain element. 

Sort of a small, poor-quality thyratron. Not too practical, but a fun way to kill an afternoon in my retirement (circa 2040 hopefully). 

>Terrible as a tube, especially for $50. 

Yeah, those plate curves would give small children nightmares, if they knew what they were looking at. 

And they're schlooow.  

Cheers

Phil Hobbs

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#461842

From	Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com>
Date	2017-05-26 10:42 -0700
Message-ID	<h6qgicpboiiqko3c6o49jkm1hbjqfh6had@4ax.com>
In reply to	#461841

On Fri, 26 May 2017 10:37:07 -0700 (PDT), pcdhobbs@gmail.com wrote:

>>Someone here (me, actually) once conjectured about using a VF display 
>>as a gain element. 
>
>Sort of a small, poor-quality thyratron. Not too practical, but a fun way to kill an afternoon in my retirement (circa 2040 hopefully).

When I turn 100 ;-)
 
>
>>Terrible as a tube, especially for $50. 
>
>Yeah, those plate curves would give small children nightmares, if they knew what they were looking at. 

Typical for triodes.

>
>And they're schlooow.  
>
>Cheers
>
>Phil Hobbs
		
                                        ...Jim Thompson
-- 
| James E.Thompson                                 |    mens     |
| Analog Innovations                               |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| STV, Queen Creek, AZ 85142    Skype: skypeanalog |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |

     Thinking outside the box... producing elegant solutions.

"It is not in doing what you like, but in liking what you do that
is the secret of happiness."  -James Barrie

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#461849

From	bitrex <bitrex@de.lete.earthlink.net>
Date	2017-05-26 14:09 -0400
Message-ID	<ob_VA.92007$bP2.29303@fx13.iad>
In reply to	#461841

On 05/26/2017 01:37 PM, pcdhobbs@gmail.com wrote:
>> Someone here (me, actually) once conjectured about using a VF display
>> as a gain element.
> 
> Sort of a small, poor-quality thyratron. Not too practical, but a fun way to kill an afternoon in my retirement (circa 2040 hopefully).
> 
>> Terrible as a tube, especially for $50.
> 
> Yeah, those plate curves would give small children nightmares, if they knew what they were looking at.
> 
> And they're schlooow.
> 
> Cheers
> 
> Phil Hobbs
> 

The plate curves would be very linear in the region between 40 and 80 
volts Va and 1.0 -> -1.0 volts on the grid. Sadly the anode can barely 
handle any power dissipation.

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#461847

From	bitrex <bitrex@de.lete.earthlink.net>
Date	2017-05-26 14:02 -0400
Message-ID	<n5_VA.10451$j%.9756@fx03.iad>
In reply to	#461839

On 05/26/2017 01:24 PM, John Larkin wrote:
> On Fri, 26 May 2017 12:45:36 -0400, bitrex
> <bitrex@de.lete.earthlink.net> wrote:
> 
>> New-manufacture dual triode vacuum tube made in a VFD factory, looks like:
>>
>> <http://www.ebay.com/itm/Korg-NuTube-6P1-low-power-triode-vacuum-tube-/222378278144?ssPageName=STRK:MESE:IT&afsrc=1&rmvSB=true>
>>
>> Here's the datasheet:
>>
>> <http://www.nutube.us/downloads/Nutube_Datasheet_31.pdf>
> 
> Somewone here (me, actually) 

Naturally

> once conjectured about using a VF display
> as a gain element.

Yep, it's been done. You can build a ring modulator with 'em too

> Terrible as a tube, especially for $50. Probably a good 60 Hz magnetic
> field sensor.

I'm guessing $50 is the "middleman makes his cut" price, not if one were 
to order direct from the factory in quantity, fortunately.

They're probably designed to be used in the "classic" 
"tube-harmonic-exciter" circuit for beatboxes and stuff: run the same 
signal 180 degrees out of phase into two tube grids (grid resistor 
strapped between the sections), take output from plats into a 
differential amplifier, sum into another diff amp with the original 
signal so you only get the difference between what went into the toobs 
and what came out, mix into original signal with a variable "Warm" control

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#461865

From	tabbypurr@gmail.com
Date	2017-05-26 13:20 -0700
Message-ID	<37336d9c-0cb0-4bcc-9ae1-19a9c6bb9b21@googlegroups.com>
In reply to	#461839

On Friday, 26 May 2017 18:25:14 UTC+1, John Larkin  wrote:
> On Fri, 26 May 2017 12:45:36 -0400, bitrex
> <bitrex@de.lete.earthlink.net> wrote:
> 
> >New-manufacture dual triode vacuum tube made in a VFD factory, looks like:
> >
> ><http://www.ebay.com/itm/Korg-NuTube-6P1-low-power-triode-vacuum-tube-/222378278144?ssPageName=STRK:MESE:IT&afsrc=1&rmvSB=true>
> >
> >Here's the datasheet:
> >
> ><http://www.nutube.us/downloads/Nutube_Datasheet_31.pdf>
> 
> Somewone here (me, actually) once conjectured about using a VF display
> as a gain element.

it works well enough

> Terrible as a tube, especially for $50. Probably a good 60 Hz magnetic
> field sensor.

mad price, mad specs, obsolote tech.


NT

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#461856

From	Winfield Hill <hill@rowland.harvard.edu>
Date	2017-05-26 12:16 -0700
Message-ID	<og9uv001k9h@drn.newsguy.com>
In reply to	#461828

bitrex wrote...
>
>New-manufacture dual triode vacuum tube made in a VFD factory, looks like:
>
><http://www.ebay.com/itm/Korg-NuTube-6P1-low-power-triode-vacuum-tube-/222378278144?ssPageName=STRK:MESE:IT&afsrc=1&rmvSB=true>
>
>Here's the datasheet:
><http://www.nutube.us/downloads/Nutube_Datasheet_31.pdf>

 This is for the tube-sound audio people?


-- 
 Thanks,
    - Win

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#461861

From	bitrex <bitrex@de.lete.earthlink.net>
Date	2017-05-26 15:53 -0400
Message-ID	<JI%VA.41845$8c1.31349@fx19.iad>
In reply to	#461856

On 05/26/2017 03:16 PM, Winfield Hill wrote:
> bitrex wrote...
>>
>> New-manufacture dual triode vacuum tube made in a VFD factory, looks like:
>>
>> <http://www.ebay.com/itm/Korg-NuTube-6P1-low-power-triode-vacuum-tube-/222378278144?ssPageName=STRK:MESE:IT&afsrc=1&rmvSB=true>
>>
>> Here's the datasheet:
>> <http://www.nutube.us/downloads/Nutube_Datasheet_31.pdf>
> 
>   This is for the tube-sound audio people?
> 
> 

Pretty much the only reason you'd bring any kind of new vacuum tube 
product to market these days I suppose...;-)

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#461863

From	John Larkin <jjlarkin@highland_snip_technology.com>
Date	2017-05-26 12:59 -0700
Message-ID	<o42hic9ohds0c1jf8t08pu4g402mkruscb@4ax.com>
In reply to	#461856

On 26 May 2017 12:16:48 -0700, Winfield Hill
<hill@rowland.harvard.edu> wrote:

>bitrex wrote...
>>
>>New-manufacture dual triode vacuum tube made in a VFD factory, looks like:
>>
>><http://www.ebay.com/itm/Korg-NuTube-6P1-low-power-triode-vacuum-tube-/222378278144?ssPageName=STRK:MESE:IT&afsrc=1&rmvSB=true>
>>
>>Here's the datasheet:
>><http://www.nutube.us/downloads/Nutube_Datasheet_31.pdf>
>
> This is for the tube-sound audio people?

I'm thinking about microphonics, especially from that long suspended
filament.


-- 

John Larkin         Highland Technology, Inc
picosecond timing   precision measurement 

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

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#461867

From	tabbypurr@gmail.com
Date	2017-05-26 13:34 -0700
Message-ID	<6419a7b4-6e3a-45c4-99da-925445b16d39@googlegroups.com>
In reply to	#461863

On Friday, 26 May 2017 20:59:25 UTC+1, John Larkin  wrote:
> On 26 May 2017 12:16:48 -0700, Winfield Hill
> <hill@rowland.harvard.edu> wrote:
> 
> >bitrex wrote...
> >>
> >>New-manufacture dual triode vacuum tube made in a VFD factory, looks like:
> >>
> >><http://www.ebay.com/itm/Korg-NuTube-6P1-low-power-triode-vacuum-tube-/222378278144?ssPageName=STRK:MESE:IT&afsrc=1&rmvSB=true>
> >>
> >>Here's the datasheet:
> >><http://www.nutube.us/downloads/Nutube_Datasheet_31.pdf>
> >
> > This is for the tube-sound audio people?
> 
> I'm thinking about microphonics, especially from that long suspended
> filament.

VFDs are lousy for that. Hopefully they've at least added more than the usual display supports. 

What I don't understand is why 1.7mW anode dissipation? I suppose it keeps heater current low for battery use. If it were meatier it could work as a headphone amp too.

But really you don't need to pay 50 notes for a dual triode. Unless you want very low heater power.

NT

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#461881

From	bitrex <bitrex@de.lete.earthlink.net>
Date	2017-05-26 17:49 -0400
Message-ID	<up1WA.28538$Pq7.3172@fx21.iad>
In reply to	#461867

On 05/26/2017 04:34 PM, tabbypurr@gmail.com wrote:

> VFDs are lousy for that. Hopefully they've at least added more than the usual display supports.
> 
> What I don't understand is why 1.7mW anode dissipation? I suppose it keeps heater current low for battery use. If it were meatier it could work as a headphone amp too.

<https://www.dropbox.com/s/8lgqxv3j7jsxfly/20170526_174629.jpg?dl=0>

"There I Fixed It"

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#461887

From	John Larkin <jjlarkin@highland_snip_technology.com>
Date	2017-05-26 14:58 -0700
Message-ID	<769hic5u3k0okuca4c9v90svjnhl2p7euu@4ax.com>
In reply to	#461881

On Fri, 26 May 2017 17:49:14 -0400, bitrex
<bitrex@de.lete.earthlink.net> wrote:

>On 05/26/2017 04:34 PM, tabbypurr@gmail.com wrote:
>
>> VFDs are lousy for that. Hopefully they've at least added more than the usual display supports.
>> 
>> What I don't understand is why 1.7mW anode dissipation? I suppose it keeps heater current low for battery use. If it were meatier it could work as a headphone amp too.
>
><https://www.dropbox.com/s/8lgqxv3j7jsxfly/20170526_174629.jpg?dl=0>
>
>"There I Fixed It"

The toob is not drawn right; it's a direct-heat filament. And that
circuit will need a floating filament supply.


-- 

John Larkin         Highland Technology, Inc
picosecond timing   precision measurement 

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

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#461891

From	bitrex <bitrex@de.lete.earthlink.net>
Date	2017-05-26 18:13 -0400
Message-ID	<zM1WA.124993$MW5.90317@fx36.iad>
In reply to	#461887

On 05/26/2017 05:58 PM, John Larkin wrote:
> On Fri, 26 May 2017 17:49:14 -0400, bitrex
> <bitrex@de.lete.earthlink.net> wrote:
> 
>> On 05/26/2017 04:34 PM, tabbypurr@gmail.com wrote:
>>
>>> VFDs are lousy for that. Hopefully they've at least added more than the usual display supports.
>>>
>>> What I don't understand is why 1.7mW anode dissipation? I suppose it keeps heater current low for battery use. If it were meatier it could work as a headphone amp too.
>>
>> <https://www.dropbox.com/s/8lgqxv3j7jsxfly/20170526_174629.jpg?dl=0>
>>
>> "There I Fixed It"
> 
> The toob is not drawn right; it's a direct-heat filament. And that
> circuit will need a floating filament supply.
> 

Since the filament doesn't draw much current I think you could feed a 
voltage regulator from the B+ for the direct heat filament voltage, and 
bootstrap the "ADJ" pin from the cathode follower's output.

"There I Fixed It"

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#461920

From	tabbypurr@gmail.com
Date	2017-05-26 17:28 -0700
Message-ID	<bee55b64-7c52-4a20-bc63-ddd59b13d42c@googlegroups.com>
In reply to	#461891

On Friday, 26 May 2017 23:13:55 UTC+1, bitrex  wrote:
> On 05/26/2017 05:58 PM, John Larkin wrote:
> > On Fri, 26 May 2017 17:49:14 -0400, bitrex
> > <bitrex@de.lete.earthlink.net> wrote:
> >> On 05/26/2017 04:34 PM, tabbypurr wrote:
> >>
> >>> VFDs are lousy for that. Hopefully they've at least added more than the usual display supports.
> >>>
> >>> What I don't understand is why 1.7mW anode dissipation? I suppose it keeps heater current low for battery use. If it were meatier it could work as a headphone amp too.
> >>
> >> <https://www.dropbox.com/s/8lgqxv3j7jsxfly/20170526_174629.jpg?dl=0>
> >>
> >> "There I Fixed It"
> > 
> > The toob is not drawn right; it's a direct-heat filament. And that
> > circuit will need a floating filament supply.
> > 
> 
> Since the filament doesn't draw much current I think you could feed a 
> voltage regulator from the B+ for the direct heat filament voltage, and 
> bootstrap the "ADJ" pin from the cathode follower's output.
> 
> "There I Fixed It"

I'm not seeing any need for the supply to be floating. In fact it can't be with a direct heated filament valve.


NT

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#461918

From	tabbypurr@gmail.com
Date	2017-05-26 17:24 -0700
Message-ID	<91deb2de-0c6b-41c6-87c9-76b6ed2ce4f6@googlegroups.com>
In reply to	#461881

On Friday, 26 May 2017 22:49:18 UTC+1, bitrex  wrote:
> On 05/26/2017 04:34 PM, tabbypurr wrote:
> 
> > VFDs are lousy for that. Hopefully they've at least added more than the usual display supports.
> > 
> > What I don't understand is why 1.7mW anode dissipation? I suppose it keeps heater current low for battery use. If it were meatier it could work as a headphone amp too.
> 
> <https://www.dropbox.com/s/8lgqxv3j7jsxfly/20170526_174629.jpg?dl=0>
> 
> "There I Fixed It"

kind of. You added another amplification stage in silicon - the seller couldn't claim that to be a vacuum state output. I guess they could describe their product as vacuous though.

If the thing could put out enough to drive a headphone it wouldn't need any transistors at all to run off a pc or similar input.

NT

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#461959

From	Jan Panteltje <pNa0nStpealmtje@yahoo.com>
Date	2017-05-27 07:06 +0000
Message-ID	<ogb8ho$1bbc$1@gioia.aioe.org>
In reply to	#461867

On a sunny day (Fri, 26 May 2017 13:34:56 -0700 (PDT)) it happened
tabbypurr@gmail.com wrote in
<6419a7b4-6e3a-45c4-99da-925445b16d39@googlegroups.com>:
>
>But really you don't need to pay 50 notes for a dual triode. Unless you want very low heater power.
>
>
>NT

We discussed radioactive isotope tube heaters long time ago.

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#461872

From	bitrex <bitrex@de.lete.earthlink.net>
Date	2017-05-26 16:47 -0400
Message-ID	<Kv0WA.232678$kI.18775@fx43.iad>
In reply to	#461863

On 05/26/2017 03:59 PM, John Larkin wrote:
> On 26 May 2017 12:16:48 -0700, Winfield Hill
> <hill@rowland.harvard.edu> wrote:
> 
>> bitrex wrote...
>>>
>>> New-manufacture dual triode vacuum tube made in a VFD factory, looks like:
>>>
>>> <http://www.ebay.com/itm/Korg-NuTube-6P1-low-power-triode-vacuum-tube-/222378278144?ssPageName=STRK:MESE:IT&afsrc=1&rmvSB=true>
>>>
>>> Here's the datasheet:
>>> <http://www.nutube.us/downloads/Nutube_Datasheet_31.pdf>
>>
>> This is for the tube-sound audio people?
> 
> I'm thinking about microphonics, especially from that long suspended
> filament.
> 
> 

Tube warm machine idea:

<https://www.dropbox.com/s/lbm7xe044us8tr9/20170526_164028.jpg?dl=0>

Adjust the grid resistor for best warm.

(the pot on the last opamp should be on the input resistor not the 
feedback resistor)

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#461874

From	bitrex <bitrex@de.lete.earthlink.net>
Date	2017-05-26 17:03 -0400
Message-ID	<dK0WA.146388$Br6.25265@fx42.iad>
In reply to	#461872

On 05/26/2017 04:47 PM, bitrex wrote:
> On 05/26/2017 03:59 PM, John Larkin wrote:
>> On 26 May 2017 12:16:48 -0700, Winfield Hill
>> <hill@rowland.harvard.edu> wrote:
>>
>>> bitrex wrote...
>>>>
>>>> New-manufacture dual triode vacuum tube made in a VFD factory, looks 
>>>> like:
>>>>
>>>> <http://www.ebay.com/itm/Korg-NuTube-6P1-low-power-triode-vacuum-tube-/222378278144?ssPageName=STRK:MESE:IT&afsrc=1&rmvSB=true> 
>>>>
>>>>
>>>> Here's the datasheet:
>>>> <http://www.nutube.us/downloads/Nutube_Datasheet_31.pdf>
>>>
>>> This is for the tube-sound audio people?
>>
>> I'm thinking about microphonics, especially from that long suspended
>> filament.
>>
>>
> 
> Tube warm machine idea:
> 
> <https://www.dropbox.com/s/lbm7xe044us8tr9/20170526_164028.jpg?dl=0>
> 
> Adjust the grid resistor for best warm.
> 
> (the pot on the last opamp should be on the input resistor not the 
> feedback resistor)

Also connections on diffamps should be swapped to work "right" I 
believe...:-)

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#461875

From	Lasse Langwadt Christensen <langwadt@fonz.dk>
Date	2017-05-26 14:10 -0700
Message-ID	<be0d226d-8b10-47d7-b01c-7d07825993da@googlegroups.com>
In reply to	#461872

Den fredag den 26. maj 2017 kl. 22.47.42 UTC+2 skrev bitrex:
> On 05/26/2017 03:59 PM, John Larkin wrote:
> > On 26 May 2017 12:16:48 -0700, Winfield Hill
> > <hill@rowland.harvard.edu> wrote:
> > 
> >> bitrex wrote...
> >>>
> >>> New-manufacture dual triode vacuum tube made in a VFD factory, looks like:
> >>>
> >>> <http://www.ebay.com/itm/Korg-NuTube-6P1-low-power-triode-vacuum-tube-/222378278144?ssPageName=STRK:MESE:IT&afsrc=1&rmvSB=true>
> >>>
> >>> Here's the datasheet:
> >>> <http://www.nutube.us/downloads/Nutube_Datasheet_31.pdf>
> >>
> >> This is for the tube-sound audio people?
> > 
> > I'm thinking about microphonics, especially from that long suspended
> > filament.
> > 
> > 
> 
> Tube warm machine idea:
> 
> <https://www.dropbox.com/s/lbm7xe044us8tr9/20170526_164028.jpg?dl=0>
> 
> Adjust the grid resistor for best warm.
> 
> (the pot on the last opamp should be on the input resistor not the 
> feedback resistor)

you only need to connect the filament just ignore the rest

for added reliability just shine an amber led though the bottom ;)

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6P1 "NuTube"

Contents

#461828 — 6P1 "NuTube"

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#461874

#461875