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B1 Rev. 2
B1 Rev. 2
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Old 11th March 2019, 03:17 AM   #191
Junebugvinyl is offline Junebugvinyl
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Does anyone know if printed PCBs are available for the B1 rev2?
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Old 11th March 2019, 05:50 AM   #192
rookakoma is offline rookakoma  Hungary
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Quote:
Originally Posted by Junebugvinyl View Post
Does anyone know if printed PCBs are available for the B1 rev2?
10PCS 2x8cm - 9x15cm Double Side Prototype PCB Bread board Tinned Universal FR4 | eBay
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Old 11th March 2019, 02:39 PM   #193
R-K Rønningstad is offline R-K Rønningstad  Norway
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There’s also a “JFET buffer board” on eBay. JFETs cascaded with bipolars. You can tear out the bipolars and possibly exchange the JFETs with the 2SK170/2SJ74 combo.
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Old 12th March 2019, 08:02 AM   #194
ludkokanta is offline ludkokanta  Croatia
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Post #146 of this thread to catch on. I proudly invented that with spiritual guidance from Zen mod. It works, its a nice compact and simple pcb but no voltage supply compoments on it
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Old 12th March 2019, 08:21 AM   #195
Zen Mod is offline Zen Mod  Serbia
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B1 Rev. 2
of course , one can look at Iron Pumpkin schematics and , with some precise soldering can make pretty good buffer with easily accessible parts

entire thing , including reg (Good Gemini ) can be made on veroboard without too much trouble , especially if using SOT-23 pcb adaptors , cheap on fleabay and around

and yes , for tougher loads , see Borbely WCF option
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Old 9th June 2019, 02:00 PM   #196
Artari is offline Artari  Ireland
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Default B1 Korg Nutube

Hello Guys!

I bought a Firstwatt SIT 3 and I’m pairing it with a Pass labs HPA-1 and Harbeth P3ESR. The amp has 8db gain and the P3’s sensitivy is 83 db I know I could/should look at high sensitivity speakers probably but I like the sound as is even if I would need more power sometimes...
Anyway, I am interested in the B1 buffer the version with autoformer if I can have some good gain (ideally 12-15db) or the B1 Korg nutube.

I understand the Korg nutube can support well a gain of 15db. Do you. Have any confirmation/suggestions? And how can I get this gain?
Thankssss
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Old 9th June 2019, 02:40 PM   #197
Dennis Hui is online now Dennis Hui  Canada
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From p5 of the B1 Korg project document

http://www.firstwatt.com/pdf/art_diy_nutube_preamp.pdf

"Also note that the circuit as presented has a little over 16 dB of gain, and happily functions as a preamp with a logarithmic input potentiometer"
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Old 9th June 2019, 08:37 PM   #198
Artari is offline Artari  Ireland
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Thank you Dennis! Sorry but I am not diy expert... Ok so if I understand correctly if I build the B1 Korg Nutube buying the pcb from the diy audio store and following the instructions I will get around 16 db of gain whch is exactly what I am looking for to pair it with. The sit 3
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Old 10th June 2019, 03:26 AM   #199
Dennis Hui is online now Dennis Hui  Canada
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That is correct.

You can find much more info at the B1 Korg thread:

B1 with Korg Triode

Cheers,
Dennis
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Old 10th June 2019, 10:03 PM   #200
Artari is offline Artari  Ireland
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Thanks Dennis!!!
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