B1 with Korg Triode

[Algar_emi]

The AC/DC Meanwell power module MPM-20-24 is good from 80 VAC to 264 VAC, so good around the world...

 

[Rewind]

I believe we could make an LTP with the Korg tube(s) if that's what you want,
in fact I think it would be easy using a CCS on the Cathodes.

"LTP" as in Leslie Tube Preamp?

 

[R-K Rønningstad]

Long Tailed Pair - I guess you knew!!!

I would propose a JFET constant current source.
Using the NuTube for this will require some real estate as you will need one per channel.

 

[Algar_emi]

Hi. I openned a small GB, if still interested put your name. Thanks

https://www.diyaudio.com/forums/group-buys/334216-gb-b1-nutube-pcb-integrated-ps.html#post5704087

 

[rchomeless]

Nothing is wrong, mine measures the same way. It is the impact of having the caps in place. Your other measures match my own as well. Connect a source and an amp and you should be in good shape.

Having said that, I ALWAYS test with disposable speakers first...

Thanks Eric! it works now.

 

[Loudthud]

I believe we could make an LTP with the Korg tube(s) if that's what you want,
in fact I think it would be easy using a CCS on the Cathodes.

NuTubes don't have cathodes. You could tie the heaters together, but the heater supply will have to float with very little capacitance to ground. At $50USD each for a NuTube, I think I'll stick with a 12AX7 or 12AT7.

 

[Nelson Pass]

They do have cathodes.

Attached is a conceptual diagram of the Nutube as LTP.

 

[R-K Rønningstad]

 

[Halauhula]

I believe we could make an LTP with the Korg tube(s) if that's what you want,
in fact I think it would be easy using a CCS on the Cathodes.

I'm in on this. It seems all the sources and power amps I' interested in use balanced outputs and inputs, respectively.

 

[watchal]

Hi dont know this question allready post or not.
what the exactly voltage on R plate of nutube .
supply with 24v so shuould be 19 ... v on r plate 332k

thanks

 

[avtech]

I've ordered the Nutube accessory kit from RS UK. I think it's the daughter board and perspex cover that I posted a picture of a while back, but I'm not too sure as there's no description or photo on the RS website. At ~£11 with free delivery I felt it worth investigation.

I will report back when it arrives.

I'd be interested to hear what the accessory kit comprises. Can't find any information on it so far, although RS do show stock.

 

[Wodgy]

I'd be interested to hear what the accessory kit comprises. Can't find any information on it so far, although RS do show stock.

In Japan, there's apparently an official KORG accessory kit. It's possible that the RS one may be the same. Not sure how to share a link, but Akizukidenshi carries it, with photos of the contents.

 

[jostwid]

Just received board, J-Fets and tube!
Many many thanks to Papa Nelson, Qwertyl and Puggie

Time to donate something to the community! After all, what would we miss if we did not have the community!?

 

[Hadox]

In Japan, there's apparently an official KORG accessory kit. It's possible that the RS one may be the same. Not sure how to share a link, but Akizukidenshi carries it, with photos of the contents.

The accessory kit arrived yesterday.

I haven't got an image hosting account set up, but it's this one:

https://www.marutsu.co.jp/contents/shop/marutsu/img/goods/010/1349684/1349684_1.jpg

In other words, you get a small mounting board (not clearly visible in the photo), a harness and connector, a Perspex case, 3 different sized self-adhesive foam pads and some good clear English instructions (when ordered from RS UK, at least). The bigger, green board in the photo isn't included.


Additionally, there's a small socket with the same pin layout as the Nutube, so you don't have to solder the Nutube directly to the small mounting board, although this would mean the Perspex case can't be used.


Quite a neat little kit.

 

[GASCo]

That website also has an evaluation board that looks a little different than what we've seen in the west. Maybe the initial iteration of it.

Nutube 6P1用評価ボード NUTUBE-EVALUATION-BOARDの通販ならマルツオンライン

 

[laverda]

I’ve ordered a couple of kits from RS here in the UK, because as and when when the B1 Nutube becomes available through the store, I have at least one to build for a family member....
Delivery for the accessory kit is 5 days instead of next day but it’s still free shipping.... here in the UK.

 

[Halauhula]

I hope that, here in the US, DIY Store sells the accessory kit. It seems that it would be a "must-have" purchase for the socket and the nice cover.

 

[sov]

The Korg Nutube in a big box with an awful amount of nothing and some bling-bling. A led hidden behind the volume knob is a tip from someone here but I forgot who should have the credit. Shifting the B1 buffer with 25k Alps pot to B1 Korg triod it’s finally time for sound check. It’s very(!) clear, distinct and pleasant from high to low but with several clicks on the knob a bit hard. It’s fine since I never turn the volume to 11. Perhaps it’s the 10k pot speaking? Tips, tweaks and suggestions are welcome.

Nutube makes its presences when switched off with a slight ringing. No input switch due to the one source, DAC.

- Consider a change of attenuators load resistor to 20k.
- When is it applicable to shift speakers polarity?
- Fantastic base and mid but would like softer treble, perhaps too much gain for my speakers.

Transformer 50VA
Salas ultra bib
XMAS Korg Nutube PCB with 2sk370 (big thanks to Mr Pass(!) and qwertyl)
10k Stepped Attenuator w Z-foil
T1: 24,0V
T5/T6: 0,620/0,618V
T7/T8: 10V/10V

Multibit Gungnir - B1 triod - M2 - Cornwall III

 

[carsten.witt]

@japanese speaking people,

I would like to order the Nutube Accessory Kit (K-13581 / 4959112186620) from akizukidenshi.com but I can't japanese and all tried translator didn't make really sense. :-(

So my question is now can some one help me please?

Many thanks!

 

[carsten.witt]

... or, i tried some searches for this kit and didn't found another supplier or contact email. Some hints?