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B1 with Korg Triode
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Old 13th October 2018, 07:57 PM   #321
asphalt is offline asphalt
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Thank You
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Old 17th October 2018, 07:25 PM   #322
R-K Rønningstad is offline R-K Rønningstad  Norway
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One could possibly use a H2 as an inverting stage to maintain absolute phase/correct polarity of the B1-Korg. But maybe too much second harmonic out of it.

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Old 18th October 2018, 06:46 PM   #323
Nelson Pass is offline Nelson Pass  United States
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B1 with Korg Triode
My experience is that this is a trick best played once.

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Old 18th October 2018, 07:23 PM   #324
R-K Rønningstad is offline R-K Rønningstad  Norway
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Yes, I do remember you once said so, so no Mae West quote here “Too much of a good thing can be wonderful.”
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Old 19th October 2018, 02:01 AM   #325
nzlowie is offline nzlowie  Australia
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Hi all

I've just ordered Pete Millets Korg board and tube, would have prefered to use the First Watt clone board but couldn't find them....

Question now is should I use Pete's component values or do we need to change things based on development experience? I have some spare LSK170's, would these be first choice?

Any advise for this build would be gratefully received. Already using the Mesmerize buffer and have an Aska Leader pre in the pipeline...... Sort of addicted to DIY.

Cheers Dave
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Old 19th October 2018, 06:33 PM   #326
Nelson Pass is offline Nelson Pass  United States
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I think you can pop them in right where he has the bipolars.
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Old 19th October 2018, 08:45 PM   #327
asphalt is offline asphalt
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I asked Pete Millett this too. His response was:
If you to want use the JFETs instead of the bipolars in the buffer board to change drain resistors to 10K from 1 K
and add a 1K resistor in series with the gates to prevent oscillation.
Also as Nelson Pass has pointed out in previous posts you need to turn the JFET device around ie not matching the silkscreen since the source and drain leads are reversed compared to the bipolars.
I did it this way and it sounds fine.
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Old 19th October 2018, 08:46 PM   #328
tubesguy is online now tubesguy  United States
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I was just working on this today, and I'm swapping out some of the other components for the NP values, looking for something that might be able to match his gain and distortion results. If you look at the schematics side-by-side, the changes needed are apparent, and are relatively few in number. (Get some 221k resistors, always a good thing to have on hand for Nelson's projects.)

Chul is also doing this, and has posted (including some pics) in this thread.
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Old 19th October 2018, 09:31 PM   #329
MEPER is offline MEPER  Denmark
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So...….has it been decided that the NP PCB will not be offered for sale in the DIY store?
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Old 19th October 2018, 11:34 PM   #330
nzlowie is offline nzlowie  Australia
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Thanks guys. Appreciate the help.
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