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.

SIT Nemesis
SIT Nemesis
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 26th November 2016, 04:55 PM   #51
Soundhappy is offline Soundhappy  France
diyAudio Member
 
Soundhappy's Avatar
 
Join Date: Oct 2012
Location: Montpellier near Mediterranean Sea France
Quote:
Originally Posted by jamahamvui1978 View Post
Thanks soundhappy!
Mine is Z series. Have you ever build something with 2sk180 and did you SIT get hot ?

Best regards!
@ Jamahamvui1978

With high bias current they run hot normaly...
you can find and read threads here at DiyAudio Forum and visionate videos about 2SK Tokin sit's made by Mr Rothacher at
Audiohobby.com | DIY Audio Projects & More.

I just test my 2SK180 and 2SK182 not builds for the moment.
Be shure you get propery working sit's pair curve tracer test was more specyfication revelating.

Best regards
__________________
class A amplifiers with full range speakers
sings like angels in heaven
  Reply With Quote
Old 27th November 2016, 01:12 AM   #52
jamahamvui1978 is offline jamahamvui1978  Viet Nam
diyAudio Member
 
Join Date: Jul 2015
I read and vew nearly all articles or videos about SIT of Mr Pass and MR, that why my OPT for SITamp was built to withstand 2A - 64:8 or 4A if use 32:8. Unfortunately, my OPT was beginning to be warm at 2A so I had to reduce bias to 1.8A at first test. I'll increase B+ or try 32:8 later when I "vechai" out parts fit with changes.
If anyone love 211 tube and don't have Pass SIT.1, try SITamp with 2sk180. Even though all my mistakes it sound very great

Last edited by jamahamvui1978; 27th November 2016 at 01:17 AM.
  Reply With Quote
Old 22nd February 2018, 07:40 AM   #53
nagini262 is offline nagini262  Viet Nam
diyAudio Member
 
nagini262's Avatar
 
Join Date: Feb 2008
I found and bought a pair of Tango FG-50S for my friend, these OPT are the same as that I bought two years ago for build my SIT Nemesis with Pass SIT-1 transistors. Now I want to help my friend build the amp use 2SK180 transistor with output transformer.
Hi Mike! With your experience about 2SK180 and the FG-50S specification below, please help me make some quick calculation and tell me the voltages + current bias for the best sweet spot. The primary impedence is 64 ohm (2A), 32 ohm (2A) or 16 ohm (4A).
Thank in advance!

Click the image to open in full size.

Click the image to open in full size.
__________________
Music makes sublimation joy, help alleviate grief, soothe the pains and repel any resentment!
  Reply With Quote
Old 22nd February 2018, 12:00 PM   #54
Michael Rothacher is offline Michael Rothacher  United States
AudioMaker.Tech
diyAudio Member
 
Michael Rothacher's Avatar
 
Join Date: May 2001
SIT Nemesis
Oh, that's a beauty.

Without physically testing, it's hard to say for sure, but maybe I could sim something. Can anyone translate the winding resistances and inductances?

With the 2SK180 it should be pretty similar to the PASS-SIT-1, so you could certainly start there.

Having those other taps will be fun too.
__________________
Visit AudioMaker.Tech

Last edited by Michael Rothacher; 22nd February 2018 at 12:02 PM.
  Reply With Quote
Old 22nd February 2018, 12:23 PM   #55
nagini262 is offline nagini262  Viet Nam
diyAudio Member
 
nagini262's Avatar
 
Join Date: Feb 2008
Quote:
Originally Posted by Michael Rothacher View Post
Oh, that's a beauty.

Without physically testing, it's hard to say for sure, but maybe I could sim something. Can anyone translate the winding resistances and inductances?

With the 2SK180 it should be pretty similar to the PASS-SIT-1, so you could certainly start there.

Having those other taps will be fun too.
Hi Mike!
I almost bought all of things for my SIT Nemesis use PASS SIT-1 amp and I hope I will finish in next two or three months. Mr.Pass told me that I should running the PASS SIT-1 transistor with FG-50S at 25VDC + 1A bias and connect to 32 ohm tap. Now, with 2SK180 is high power VFET transistor so I and my friend want to try the higher voltage + higher bias current to create a higher power output for easy to drive some big loudspeakers but we are really don't know sweet spot and which taps for connect. I will use LCR meter and tell you correct Rdc + inductances at each tap soon.
Thanks for your care!
__________________
Music makes sublimation joy, help alleviate grief, soothe the pains and repel any resentment!
  Reply With Quote
Old 3rd March 2018, 11:35 PM   #56
nagini262 is offline nagini262  Viet Nam
diyAudio Member
 
nagini262's Avatar
 
Join Date: Feb 2008
Hi Mike!
I measured the primary windings of FG-50S by DER EE DE-5000 LCR meter with frequency is 100Hz, this is the result:
1/ Tap 64: L = 298mH, Rac = 54.91ohm, Rdc = 1.21ohm
2/ Tap 32: L = 150.83mH, Rac = 27.17ohm, Rdc = 0.89ohm
3/ Tap 16: L = 74.26mH, Rac = 13.30ohm, Rdc = 0.4ohm
I hope it will helpful for you!
__________________
Music makes sublimation joy, help alleviate grief, soothe the pains and repel any resentment!
  Reply With Quote
Old 3rd March 2018, 11:52 PM   #57
Michael Rothacher is offline Michael Rothacher  United States
AudioMaker.Tech
diyAudio Member
 
Michael Rothacher's Avatar
 
Join Date: May 2001
SIT Nemesis
Ok, I'll need some time. Lots going on right now. Email me if I forget.
__________________
Visit AudioMaker.Tech
  Reply With Quote
Old 3rd March 2018, 11:55 PM   #58
nagini262 is offline nagini262  Viet Nam
diyAudio Member
 
nagini262's Avatar
 
Join Date: Feb 2008
Just help me when you have free time.
Thanks in advance!

Quote:
Originally Posted by Michael Rothacher View Post
Ok, I'll need some time. Lots going on right now. Email me if I forget.
__________________
Music makes sublimation joy, help alleviate grief, soothe the pains and repel any resentment!
  Reply With Quote
Old 14th March 2018, 02:25 PM   #59
Michael Rothacher is offline Michael Rothacher  United States
AudioMaker.Tech
diyAudio Member
 
Michael Rothacher's Avatar
 
Join Date: May 2001
SIT Nemesis
So, wanting to keep the 2SK180 under 80W or so:

32-ohm tap, 100V B+ 800mA Id might be a good place to start. That'll get you to 18W or something like that.

You'll want some supply regulation.
__________________
Visit AudioMaker.Tech
  Reply With Quote
Old 14th March 2018, 03:53 PM   #60
nagini262 is offline nagini262  Viet Nam
diyAudio Member
 
nagini262's Avatar
 
Join Date: Feb 2008
Thank you so much for your help!!!
I really have a little surprise with your result. Can you explain a little bit about 32 ohm tap? I just think with 100V B+ and 0.8A bias so the primary impedance must be higher 32 ohm. So sorry for my question, maybe my experience is wrong about this :-(

Quote:
Originally Posted by Michael Rothacher View Post
So, wanting to keep the 2SK180 under 80W or so:

32-ohm tap, 100V B+ 800mA Id might be a good place to start. That'll get you to 18W or something like that.

You'll want some supply regulation.
__________________
Music makes sublimation joy, help alleviate grief, soothe the pains and repel any resentment!
  Reply With Quote

Reply


SIT NemesisHide 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
The Arch Nemesis jan.didden Pass Labs 16 19th April 2016 12:24 AM
Ultrasimple SIT PP amp from BAF , or SIT Beast with a Thousand PSUs Zen Mod Pass Labs 347 19th August 2015 04:27 PM
SIT-1 and SIT-2 owner manuals Nelson Pass Pass Labs 25 12th September 2012 07:16 PM
Nemesis tonistefanovski Instruments and Amps 1 12th May 2006 05:41 PM
Help on Nemesis amp RichardJones Solid State 10 16th July 2004 04:57 PM


New To Site? Need Help?

All times are GMT. The time now is 02:22 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki