B1 with Korg Triode

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Rewind

Rewind

Member
Joined 2009
jugi63 said:
Here is my version. :D

Does sound very good. Have a VAC (tube) preamp and the sound is very similar - the B1 Nutube maybe being a bit more articulate and having tighter bass. It definitely is in par, even with the basic switching power supply. No critical listening done yet though.

A big thanks, Nelson! :spin:
Click to expand...

Good thinking from Finland. The Nutube is sensitive to vibrations and wood has a nice resonance for audio. Don't burn your house down. :p
 
H

Hadox

Member
Joined 2017
Nice work, builders. Plenty of inspiration on show, thanks for sharing.

I've ordered the Nutube accessory kit from RS UK. I think it's the daughter board and perspex cover that I posted a picture of a while back, but I'm not too sure as there's no description or photo on the RS website. At ~£11 with free delivery I felt it worth investigation.

I will report back when it arrives.

Would anyone care to share an opinion on hot glue vs. Silastic vs. acoustic felt vs. Sorbothane, for Nutube vibration damping?
 
Q

qwertyl

Member
Joined 2003
qwertyl1.wixsite.com/diyaudio
My B1 Korg preamp is using the proper board now and it sounds awesome with my M2 clone :)
 

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WKCox

WKCox

Member
Joined 2004
Mrshazbot said:
Here are some pics of the final build. I went a little overboard on this one so it's a bit of overkill but I'm sure nobody minds that.

The PSU is a Sigma 11 24v regulated supply.

The volume control is a Khozmo remote controlled attenuator

I got the Nutube and carrier board from Pete Millet


The input selector is the Select-2 from Tubecad

I still need to glue the plexiglass inserts on the front panel but haven't gotten there yet but it will be smoked glass on the front.

A couple things I need to work out - My input selector pops. The other thing is that I have an Intel NUC -> DAC -> preamp and I can hear a slight buzz when the CPU is working. It wasn't there before but now I can hear it. I can't hear it while playing music but can when nothing is playing. Probably some sort of grounding thing.

Anyways, it sounds great. I have it hooked up to an F5 and it makes the bass much stronger (didn't expect that) and almost 3 dimensional but has a slight echo in my ears on the low end.

Thank you Mr. Pass !

Kevin
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Nice build Kevin!

Nelson addressed the input selection pop on the original B1 by adding 1 megohm resistors across each input. Like you, I too used the Glass-Ware Select-2 but decided to tie all the input grounds together, rather than switching grounds individually, and adding the 1 meg resistors to avoid the pop.

Just turn down the volume before changing inputs and everything should be great. :p

Enjoy!
 

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Zen Mod

Zen Mod

Official Court Jester
Joined 2003
zenmod.in.rs/
Paid Member
jugi63 said:
A Lorin Electronics silver plated contact switch. Something like this: CK – Lorlin Electronics
Click to expand...

WKCox said:
Nice build Kevin!

Nelson addressed the input selection pop on the original B1 by adding 1 megohm resistors across each input. Like you, I too used the Glass-Ware Select-2 but decided to tie all the input grounds together, rather than switching grounds individually, and adding the 1 meg resistors to avoid the pop.

Just turn down the volume before changing inputs and everything should be great. :p

Enjoy!
Click to expand...

just use shorting one (Make Before Break) and no PoP

trick old as Earth

each Lorlin , if shorting , is having big letter S somewhere between pins

read datasheet for more specific info about S and non-S
 
Q

qwertyl

Member
Joined 2003
qwertyl1.wixsite.com/diyaudio
Rewind said:
Tell us more about those Jensen transformers. Is it really a good idea? Is the goal to make them balanced? Is this the best way to do it?
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Jensen transformers... It's a long story. Ages ago I built 2 F4s and I was planning to use them as mono blocks driven by Impasse preamp. I started collecting parts, bought Jensen transformers, etc, but then I converted one of my F4s into Aleph J. I used balanced output of my DAC to drive Aleph directly. The second F4 was converted to BA-3 power amp and I built BA-3 preamp in a separate chassis. I had an idea to use Jensen transformers, which were gathering dust for a few years, as balanced to unbalanced converters on the input of my BA-3 preamp. It worked fine, but then I converted BA-3 power amp into Sony VFET. And so on and on and on... What used to be BA-3 preamp is now B1 Korg preamp. Jensen transformers are still there, and they probably work fine as balanced to unbalanced converters, but I don't use XLR connectors at the moment.
 
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