B1 with Korg Triode

[Zen Mod]

2SK170BL

LSK170B

 

[Soundhappy]

Read Mr Pass article.
Mouser has run out of stock for 2Sk 370.

You can find LSK170 in DiyAudio Store or next
source for genuine 2SK170 BL = 2SK370 jfets are
4x Toshiba Original 2SK170BL (2 Matched pairs) | eBay
Have fun

 

[Soundhappy]

Did I not post this?

Thanks Mr Pass
From updated B1 Triode article "....the sound is extremely good , the kind of sound we look for...."
and " ....in the right circumstances it's a very impressive piece.... "

Holy soldering smoke 😀 no comments

 

[Soundhappy]

Nutube price is low if buy one 60 pcs. box, taxes no included :

Nutube 6P1 | Korg Nutube Nutube 6P1 Double Triode Thermionic Valve, Parallel Base, 45 x 16 x 5.6mm | Korg Nutube

Just my 2 uA

Edit : Do B1Triode is good warm up for sound of F5 , F5 Turbo ?

 

[reelone]

You did! Looking for the ready made PCB! Thanks NP

 

[Nelson Pass]

Do B1Triode is good warm up for sound of F5 , F5 Turbo ?

I think its character would tend to complement those amplifiers with
either quite low distortion or those which have a 3rd harmonic character.

You results may vary....

 

[Soundhappy]

Thanks Mr Pass

Well noted and understood purpose

 

[reelone]

does anyone know how to convert the Pete Millett pcb for new tube to using jfets?

 

[Nelson Pass]

Do you have the schematic? The Toshiba Jfets have a pinout which is
similar to bipolar TO-92 transistors.

 

[Locke1988]

Is it possible to get some pcb for the Korg B1?

Greetings from Germany

 

[wdecho]

You can find the schematic here.

http://www.pmillett.com/images/Nutube_buffer_sch.jpg

Nutube 6P1 Buffer PCB

 

[Nelson Pass]

Pete uses the 2N7000 N channel Mosfet. The Toshiba/LS 2SK170 or
2SK370 have opposite pinouts, so you just turn them around. After that,
you want to note the different Vds, which is about 4V for the Mosfets and
0V for the Jfets, so the input bias voltage resistors would be adjusted
accordingly.

And as PM notes, you want to add a Gate stopper resistor on the Fets.

Correction: you can leave the input bias resistors the same.

 

[reelone]

Hi Nelson- just uploaded schem for Millett. Will you ever sell the PCB you made for this?

Hi Nelson-sorry for the dumb questions. Which ones are the gate stopper resistors and what value should they be?

 

[Nelson Pass]

1K is a good value. They are in series with the Gate to see to it that
the minimum impedance seen by the Gate is 1K. This prevents
parasitic oscillation.

 

[Soundhappy]

Toshiba BL matched pairs for B1 Triode are back in stock 🙂
Need 8 pcs for stereo

4x Toshiba Original 2SK170BL (2 Matched pairs) | eBay

Haha BL disappear quickly

and Korg Nutube at RS store :

Nutube 6P1 | Tube thermoionique double triode Parallele, 17 broches, 45 x 16 x 5.6mm | Korg Nutube

 

[Soundhappy]

Genuine BL for Greedy Boyz not matched option :
small :
2SK170 Toshiba J-FET Transistors Qty 20 - 2SK170BL - NEW - Audio Low Noise | eBay
BIG :
2SK170 Toshiba J-FET Transistors Qty 200 - 2SK170BL - NEW - Audio Low Noise | eBay

Happy Easter or Peace and Love for You and Family 🙂

 

[Nelson Pass]

Known reliable supplier.

At $350 for qty 200, that $1.75 each.

Get them while you can.

🙂

 

[massimo]

😱
I paid 33$/100 pcs. last time I bought them (yrs ago)
Anyway, still a bargain these days... Unfortunately no J74 🙁

 

[qwertyl]

It is $625 for 200 now...

 

[rookakoma]

Qwertyl, I opened your builds.
Each are very nice🙂