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GB B1 Nutube PCB with integrated PS
GB B1 Nutube PCB with integrated PS
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Old 26th March 2019, 08:18 AM   #161
avtech23 is offline avtech23  Australia
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GB B1 Nutube PCB with integrated PS
Yeah I think the switch is a 'break before make' for changing inputs.

I was intending to break the line between the 10R/3W and the 24VDC feed pad and insert a switch there but that will still leave the 230VAC connected so I haven't decided what to do other than yanking the cord each time.
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Old 26th March 2019, 08:37 AM   #162
Jeffreyjuice is offline Jeffreyjuice  United States
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GB B1 Nutube PCB with integrated PS
PCB received. Thanks!
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Old 26th March 2019, 09:18 AM   #163
chiily is offline chiily  United Kingdom
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I have my PCB now..yeah, thank you very much. Arrived looking like it had a tough trip.

I'm trying to get my head around the jfets needed, and this is going to be a newbie question.

I assume the PCB needs 8 JFET, 2SK370 or 170-GR, N-CH, Matched?

Thanks for the arrow.com recommendation great place.IMG_20190325_180422.jpeg
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Old 26th March 2019, 10:24 AM   #164
avtech23 is offline avtech23  Australia
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GB B1 Nutube PCB with integrated PS
:-o looks like it was delivered by a pack of wild dogs.

That's right. And best to match all 8 as close as possible. There is another part number available to use as well -J113. This needs additional resistors. There is some build tips a bit further back in this thread.

I ordered 50 2sk170gr from eBay and found out later they were coming from UTSource, who don't have a great reputation on here with regard to legitimate parts.

The items I got are physically correct with respect to the casing and markings but I have not set about electrically testing their properties yet.

Good luck with the build and make sure you remember to implement the changes in the PCB corrections PDF that should have been emailed to you when you paid for shipping.
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Old 26th March 2019, 12:29 PM   #165
Leeuwarden is offline Leeuwarden  Netherlands
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PCB arrived in the Netherlands too! Thanks Sylvian!
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Old 26th March 2019, 12:30 PM   #166
Leeuwarden is offline Leeuwarden  Netherlands
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Originally Posted by avtech23 View Post
There is another part number available to use as well -J113. This needs additional resistors.

Does anybody know what the resistor value must be when using J113's?
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Old 26th March 2019, 12:51 PM   #167
avtech23 is offline avtech23  Australia
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GB B1 Nutube PCB with integrated PS
The resistor value is picked depending on the IDSS of the Jfet.

There is a bit more information on the B1 thread:

B1 with Korg Triode
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Old 26th March 2019, 12:53 PM   #168
Leeuwarden is offline Leeuwarden  Netherlands
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Thanks!
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Old 26th March 2019, 01:03 PM   #169
Marra is online now Marra  United Kingdom
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GB B1 Nutube PCB with integrated PS
That looks like it's been run over chilly
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Old 26th March 2019, 04:14 PM   #170
chiily is offline chiily  United Kingdom
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Originally Posted by Marra View Post
That looks like it's been run over chilly
This was the other side...

The board is slightly bowed now. IMG_20190325_180419__01.jpeg
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