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B1 with Korg Triode
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Old 13th March 2018, 04:48 PM   #131
wdecho is offline wdecho  United States
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B1 with Korg Triode
You can find the schematic here.

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

Nutube 6P1 Buffer PCB
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Old 13th March 2018, 05:15 PM   #132
Nelson Pass is offline Nelson Pass  United States
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B1 with Korg Triode
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.

Last edited by Nelson Pass; 13th March 2018 at 05:18 PM.
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Old 13th March 2018, 05:56 PM   #133
reelone is offline reelone  United States
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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?
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File Type: pdf Nutube_buffer_sch.pdf (48.8 KB, 117 views)
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Old 14th March 2018, 12:03 AM   #134
Nelson Pass is offline Nelson Pass  United States
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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.
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Old 29th March 2018, 08:46 PM   #135
Soundhappy is offline Soundhappy  France
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B1 with Korg Triode
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
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Old 29th March 2018, 09:09 PM   #136
Soundhappy is offline Soundhappy  France
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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
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Old 30th March 2018, 05:41 PM   #137
Nelson Pass is offline Nelson Pass  United States
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Known reliable supplier.

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

Get them while you can.

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Old 31st March 2018, 08:06 AM   #138
massimo is offline massimo  Italy
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I paid 33$/100 pcs. last time I bought them (yrs ago)
Anyway, still a bargain these days... Unfortunately no J74
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Old 1st April 2018, 07:54 AM   #139
qwertyl is offline qwertyl  United Kingdom
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It is $625 for 200 now...
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Old 1st April 2018, 03:25 PM   #140
rookakoma is offline rookakoma  Hungary
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Qwertyl, I opened your builds.
Each are very nice
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