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
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 10th February 2020, 09:12 PM   #4141
TYM is offline TYM  France
diyAudio Member
 
TYM's Avatar
 
Join Date: Jun 2019
Location: Lyon
I used the Nelson Pass recommended wall warts and the caps are the originals...
  Reply With Quote
Old 10th February 2020, 09:23 PM   #4142
ClaudeG is offline ClaudeG
diyAudio Member
 
Join Date: Jan 2015
Thanks TYM

On my side I used one similar to what Papa recommended but with 40% less ripple and a tad more oomph. Perhaps this would have given you a similar improvement, who knows.

Working from there, I upgraded 3 PS caps from 1000 to 2200uf. That brought (only) a subtle improvement, diminishing returns I guess. From there a huge linear regulated lab supply with far more amp capability brought a slightly different sound, but not really a better one, so I kept my quality wall wart and upgraded caps (and I didn't think I would, LOL).

What really brought a decisive upgrade IMHO were the cap replacement (the 3 electrolytic caps in the signal path per channel replacesd by 3 PPP caps), and of course a quality pot (Tocos in my case)

Enjoy your unit very much

Claude
  Reply With Quote
Old 10th February 2020, 09:27 PM   #4143
TYM is offline TYM  France
diyAudio Member
 
TYM's Avatar
 
Join Date: Jun 2019
Location: Lyon
Thank you Claude for your advices
  Reply With Quote
Old 10th February 2020, 09:36 PM   #4144
ClaudeG is offline ClaudeG
diyAudio Member
 
Join Date: Jan 2015
You are welcome anytime :-)
  Reply With Quote
Old 11th February 2020, 11:26 PM   #4145
rmauror is offline rmauror  Italy
diyAudio Member
 
Join Date: May 2018
Location: Piedmont, near Turin
Sorry about 4107#, maybe before I translated incorrectly... I wanted to mention that the Mr. Pass project is very nice, certainly not the one I assembled! ... damn google translator... and my english language ... I keep working on completing the Korg B1 preamp and Aleph 3 amplifier, when I have free time. From the test performed about 10 days ago, I really think that the paired Pass preamp + Pass amp is excellent!
The attached images are certainly out of topics, but allow me that I am really very excited about my first project, that I want to share it with all of you.
Thanks and good music to all of you!
Mauro
Attached Images
File Type: jpg Aleph3 001.JPG (78.9 KB, 374 views)
File Type: jpg Aleph3 002.JPG (61.3 KB, 375 views)

Last edited by rmauror; 11th February 2020 at 11:32 PM.
  Reply With Quote
Old 14th February 2020, 10:47 AM   #4146
polaron is offline polaron  France
diyAudio Member
 
Join Date: Aug 2013
B1 with Korg Triode
Hello, I'm back!

Rather than making a new pre amp and a new amp, I decided to improve the performance of my Korg tube pre amp and USSA2 amplifier. They are already improved with the best parts in the right places and the sound is excellent, but it can be pushed further...


So, I am trying to detect what are the parts, in the KORG PRE AMP that are in the signal path. Well, I will not change the transistors for better ones...(Ih Ih Ih!!! I'm kidding!)


Seing the schematic of our Korg preamp, the one in the manual, the original, I would say that in the INPUT we have 50K, 10μf and 1K in the signal path, and in the OUTPUT we have 10μf and 100R.


Can anyone confirm or correct?


Also, It seams to me that the 1K connected to the plate and Q1 is for signal, but anyway, it must be important, connected to the plate. I bet is signal, yes it is. There is also a 10μf cap going to the triode. That said, all the 10μf caps in my preamp are from kaisei. I would use a very good resistor in this 1K.


Thank you!
Francisco
  Reply With Quote
Old 14th February 2020, 02:09 PM   #4147
ClaudeG is offline ClaudeG
diyAudio Member
 
Join Date: Jan 2015
Hi,

Of course you could replace a lot of parts but I am not sure that it would bring a lot of benefits nor that you would also end up ruining the set up by replacing some parts that are relevant to the sound tuning as wanted by Papa.

IMHO, the most benefits are obtained by simply replacing the 3 10uF electrolytic caps (per channel, so 6 in total) that are directly in the signal path and have no other function than blocking DC (and act secondary as "unwanted high pass filters"). You can do that 6 cap mod easily and I found, as many others, that it did improve the sound a lot. Not sure you can do much more TBH, but glad to be proven wrong. I studied the schmatic back then with the help of others here and found that some 'part tuning' my limited understanding had led me to consider initialy... would have been risky or detrimental.

In short, you can replace these 6 caps with PPP caps with other (much lower) values. If you are interested in findind out more on that, I advise you use the search function around my posts: I posted some months ago here a hopefully comprehensive describtion on this topic (parts, calculations to determine the cap's values, fitting instructions and humble personal sonic review)

Good luck either way, that B1 Korg is a fantastic gift from Papa, with some but limited tuning potential re parts swap - but then don't forget the voltage bias allows also lot of (unique?) possibilities and it sounds already great as it is!

Claude
  Reply With Quote
Old 14th February 2020, 03:11 PM   #4148
polaron is offline polaron  France
diyAudio Member
 
Join Date: Aug 2013
B1 with Korg Triode
ClaudeG,


Thank you for your valuable comment.


I have the best 10μf caps available, in my opinion, installed.
They're from Audio Note Kaisei, non-polar.
Each time I use them in signal, when lytics are necessary, I have very good results.
They are very expennsive for lytics, but hey, if you can improve the sound of your pre amplifier with a few euros...
that's not expensive at all.


When you say "In short, you can replace these 6 caps with PPP caps with other (much lower) values", do you mean that lower values will be better for SQ?
When you say lower values, do you mean not lytics, like film caps, for example 1 or 2μf films?


In my experience, when I install a much better resistor in the signal path like the Z foils, for example, I get impressive improvements, so important as caps.
Do you really think that swapping those resistors that are directly in the signal path will not make a difference?



In the other hand, I may be wrong.
One day I decided to change all the important parts of a litle amplifier and solder very good boutique ones. I had two of those amps in a drawer.
I was very excited and the amp sounded very good to me, after the mods.

Then I decided to ear the amp without the mods and the sound was exactly the same...

Last edited by polaron; 14th February 2020 at 03:15 PM.
  Reply With Quote
Old 14th February 2020, 10:10 PM   #4149
ClaudeG is offline ClaudeG
diyAudio Member
 
Join Date: Jan 2015
Hi,

Quote: When you say lower values, do you mean not lytics, like film caps, for example 1 or 2μf films?

Yes of course, that's the point as said previously! Forget electrolytics, whatever good they are supposed to be, IMHO they will never sound as good as PPP caps. But that's me and my ears :-).
And the beauty is the initial values are not required, see my posts (search function is your friend, all what I know has been written here).

I realise perhaps you not to understand all of my previous post. PPP stands for "polypropylène", as you are likely to be French, so indeed NO electrolytics is in the signal path in my case.

Quote: In my experience, when I install a much better resistor in the signal path like the Z foils, for example, I get impressive improvements, so important as caps.
Does not match mine. As long as the resistors are non magnetic and very good quality low ppm ones, I must say I don't make any difference at all. OK, some exotic boutique parts do sound indeed differently, not necessarly better, guess a matter of distorsion? Can be useful to adjust some things, but TBH, I am not really into all that as I like to get things right first time, so I leave you with testing resistors and will be delighted to read your report. Reading your post again, I am not sure you are that convinced either ;-)

Good luck whatever your decision and let us know your findings

Claude
  Reply With Quote
Old 14th February 2020, 11:03 PM   #4150
polaron is offline polaron  France
diyAudio Member
 
Join Date: Aug 2013
B1 with Korg Triode
It's late and I am very interested about that search in your posts. Tomorrow.


I wondered what PPP is. Now I know! Lately I found the meaning of SQ, BTW and TBH.
My english is improving! But TBH, sometimes french people talk by initials. BTW, I'm portuguese, living in France.



Yes, PPPs are much much better than lytics for signal, that I know.
Some not expensive but good PPPs are not so cheap whatsoever...
I wonder if low values like 0.47μf and 1μf would work here.
I am very excited with this mod. I will definitely make it.

Can you help me with these values or... do I find some explanation about it in your posts? (That I'll be seeing tomorrow)


I decided that I will install the PPPs. Can't miss it. Then, I can try VARS or Audio Notes, just one per chanel and if it works I'll replace the others. I will report here.


Thanks!
  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 156 24th December 2019 12:33 AM
New tube tech from Korg Newk_Yuler Tubes / Valves 38 15th January 2017 02:55 AM
2 X PIONEER CDJ-1000 MK3 PLAYER, Korg M3 88-Key Workstation / Sampler,Yamaha Korg holocoast Vendor's Bazaar 0 22nd August 2009 08:03 AM
tapping into keyboard of Korg Polysix mashaffer Instruments and Amps 0 5th October 2008 02:06 AM
Just ordered a Korg EMX-1 MikeHunt79 Tubes / Valves 5 19th May 2008 09:34 PM


New To Site? Need Help?

All times are GMT. The time now is 01:32 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki