Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

B1 with Korg Triode
B1 with Korg Triode
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 20th July 2019, 10:08 PM   #2731
bullitt5094 is offline bullitt5094  United States
DIY Rookie
diyAudio Member
 
bullitt5094's Avatar
 
Join Date: Jan 2012
Location: Cypress, TX
B1 with Korg Triode
Cool! That amp looks awesome. I'm sure the Cornwalls will drive you out of the room at about 5 watts so I'm betting the F4 is running class A+ ;-). I would love to hear that setup. My F5 board and components were delivered to day. So that's on the TTD list after the B1K build.
  Reply With Quote
Old 21st July 2019, 12:22 AM   #2732
cjfrbw is offline cjfrbw  United States
diyAudio Member
 
Join Date: Mar 2007
Location: SF East Bay
Quote:
Originally Posted by juanitox View Post
B1 works great with any VFET amps , i wonder if the B1 Korg will not be too creamy with them .

someone tried the Combo ?
B1 Korg with Pass Clone VFET to Stax headphones is excellent in both positive and negative phase (to switch them, just switch the outputs). B1 Korg also sounds great with Yamaha B2 VFET to planar speakers. It does not seem to overdose the harmonics in the 1V or below range.
  Reply With Quote
Old 21st July 2019, 07:49 AM   #2733
Roo2 is offline Roo2  Australia
diyAudio Member
 
Join Date: Jan 2016
Location: Brissy
Quote:
Originally Posted by Nelson Pass View Post
Swap the Jfets left for right ch, one at a time if you like, until the problem
goes to the other channel. If it doesn't then it's likely the tube.

If it's a bad Jfet, email me.
Thanks Nelson. Swapped two pairs of jfets today. Tricky to get them out! No change yet.
  Reply With Quote
Old 22nd July 2019, 02:21 AM   #2734
Roo2 is offline Roo2  Australia
diyAudio Member
 
Join Date: Jan 2016
Location: Brissy
Quote:
Originally Posted by Roo2 View Post
Thanks Nelson. Swapped two pairs of jfets today. Tricky to get them out! No change yet.
Had a bit of a setback swapping the last two pairs of jfets.. Broke a leg off the last one trying to get it out.. Anyway, the problem didnít move from right to left with the swapping so the jfets must have been ok. Must be something else..
  Reply With Quote
Old 22nd July 2019, 05:26 PM   #2735
Nelson Pass is offline Nelson Pass  United States
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
B1 with Korg Triode
You can email me for a replacement Jfet.
  Reply With Quote
Old 23rd July 2019, 08:31 PM   #2736
bullitt5094 is offline bullitt5094  United States
DIY Rookie
diyAudio Member
 
bullitt5094's Avatar
 
Join Date: Jan 2012
Location: Cypress, TX
B1 with Korg Triode
Quote:
Originally Posted by 6L6 View Post
Lol...

Not this afternoon. But getting pretty close, finally.

6L6, if not the kits, are we close to having the chassis available at least?
  Reply With Quote
Old 23rd July 2019, 09:08 PM   #2737
6L6 is offline 6L6  United States
diyAudio Moderator
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
B1 with Korg Triode
I don’t do those, but yes, they are also getting close.
  Reply With Quote
Old 23rd July 2019, 10:10 PM   #2738
bullitt5094 is offline bullitt5094  United States
DIY Rookie
diyAudio Member
 
bullitt5094's Avatar
 
Join Date: Jan 2012
Location: Cypress, TX
B1 with Korg Triode
Thanks! What about the Power Supply PCBs? Is that your area?
  Reply With Quote
Old 24th July 2019, 10:56 AM   #2739
LUX35 is offline LUX35  France
diyAudio Member
 
Join Date: Jan 2011
Location: Bretagne Rennes
I finished the preamp and tried after 72 hours of heating, the B1 Korg.
A small report was needed because this preamp is well worth it.

I wanted to make it as minimal as possible and for a cost not exceeding $ 200:
One input, a potentiometer, the Korg card of Nelson with its Meanwell 75/24 power supply and one output.

Optimization of the links so that they are as short as possible and use of an excellent potentiometer: the Alps RK40.

The listening base: CD pro2, Dac PCM 1704, VFet from N.Pass, Tannoy GRF + ST100, Belden and Mogami cables.

Although with a sensitivity of 95db GRF, no hum.
However if you tap on the card, a microphone noise is heard, but who would enjoy playing the battery on the card?

In this configuration, the best sound (for me) is to associate with T7 / T8 at 9.7V and the wiring to the out of phase speakers.
The sound is ample, with a nice bass base, well timbre and associated with a great speed on transients (eg CD: The Ozelltapes Marcus Miller disc 1 / band 4)

I compared the Korg B1 with 3 other preamps: Accuphase C2000, Luxman CL360, and a DIY SE 5687 WOT in the same configuration as written above.

The Korg has nothing to envy to these 3 preamps, it is closer to the DIY SE5687.
Now, he misses it to be universal, an excellent phono input.

Thank you Nelson for this great exercise.
Good DIY to all,
Christophe

thumb_IMG_0049_1024.jpg

thumb_IMG_0048_1024.jpg
  Reply With Quote
Old 24th July 2019, 11:05 AM   #2740
Soundhappy is offline Soundhappy  France
diyAudio Member
 
Soundhappy's Avatar
 
Join Date: Oct 2012
Location: Montpellier near Mediterranean Sea France
Beautyful build Congratulations and thanks for sharing description about audio.
Have a nice day
__________________
class A amplifiers with full range speakers
sings like angels in heaven
  Reply With Quote

Reply


B1 with Korg TriodeHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Korg NuTube is now available online pmillett Vendor's Bazaar 153 18th August 2019 11:21 PM
New tube tech from Korg Newk_Yuler Tubes / Valves 38 15th January 2017 01:55 AM
2 X PIONEER CDJ-1000 MK3 PLAYER, Korg M3 88-Key Workstation / Sampler,Yamaha Korg holocoast Vendor's Bazaar 0 22nd August 2009 07:03 AM
tapping into keyboard of Korg Polysix mashaffer Instruments and Amps 0 5th October 2008 01:06 AM
Just ordered a Korg EMX-1 MikeHunt79 Tubes / Valves 5 19th May 2008 08:34 PM


New To Site? Need Help?

All times are GMT. The time now is 04:53 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki