K176 + J50 pairing, any problems? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 13th February 2014, 01:30 AM   #1
Junm is offline Junm  Philippines
diyAudio Member
 
Junm's Avatar
 
Join Date: Dec 2008
Location: Dau
Send a message via Yahoo to Junm
Default K176 + J50 pairing, any problems?

A friend of mine comes to me and ask to build him a mosfet amp, but he gave me 2SK176 and 2sJ50's.... I know they are not exact compliments but it his only stocks 4 pcs K176 and 4 pcs J50..He could not find K135 or J56 and if there is, it's definitely expensive

Looking at the attached datasheet...k176/j56 are higher voltage /wattage (200v/125w) version of the K135/J50.

What will be the consequences if I push-through the project using PP amp sch with +/- 50V rails?
Attached Files
File Type: pdf 2SK175_76.pdf (91.4 KB, 24 views)
  Reply With Quote
Old 13th February 2014, 11:47 PM   #2
Junm is offline Junm  Philippines
diyAudio Member
 
Junm's Avatar
 
Join Date: Dec 2008
Location: Dau
Send a message via Yahoo to Junm
With 70 views no one have the idea if it's possible. These are laterals i think VGS will be the issue. Looking the typical transfer characteristics there's only a slight variance in Vgs with reference to Drain current.

With the verticals like the IRF's and FQP's , this is possible as long as the rds is closely match irregardless of max VDD and Max drain current capability as well as Crss, Ciss and Coss.
Any can shade some light here?
Attached Files
File Type: pdf 2SJ49_50.pdf (194.3 KB, 5 views)
File Type: pdf 2SK175_76.pdf (91.4 KB, 2 views)

Last edited by Junm; 13th February 2014 at 11:58 PM.
  Reply With Quote
Old 13th February 2014, 11:55 PM   #3
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
Asymmetrical distortion.

These devices are recommended to be used as complimentary pairs. Substituting a similar device for one that is recommended is a recipe for a horrible result.
  Reply With Quote
Old 13th February 2014, 11:57 PM   #4
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
no problems
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 13th February 2014, 11:59 PM   #5
Junm is offline Junm  Philippines
diyAudio Member
 
Junm's Avatar
 
Join Date: Dec 2008
Location: Dau
Send a message via Yahoo to Junm
Quote:
Originally Posted by Zen Mod View Post
no problems
Regarding what aspects?
  Reply With Quote
Old 14th February 2014, 12:03 AM   #6
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
keep voltages in sane region for lower voltage parts and that's it

N and P polarity of these mosfets - regarding capacitances, even for strict complementary parts , aren't the same - that's why you can see (often) additional picocaps on one side of OS

I had opportunity to see Hafler DH200 coming from factory with mixed (as your intention) mosfets in output - one polarity for DH200 , other one for DH500

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 14th February 2014, 12:10 AM   #7
Junm is offline Junm  Philippines
diyAudio Member
 
Junm's Avatar
 
Join Date: Dec 2008
Location: Dau
Send a message via Yahoo to Junm
Quote:
Originally Posted by Zen Mod View Post
keep voltages in sane region for lower voltage parts and that's it

N and P polarity of these mosfets - regarding capacitances, even for strict complementary parts , aren't the same - that's why you can see (often) additional picocaps on one side of OS

I had opportunity to see Hafler DH200 coming from factory with mixed (as your intention) mosfets in output - one polarity for DH200 , other one for DH500

That's a big enlightenment Zen Mod....Thanks.

Keeping the same voltage that will not exceed the lower pair.
According the owner of these Mosfets it was originaly intended for Hafler's as repair kits and these are the ones left and cannot find exact compliments.

Last edited by Junm; 14th February 2014 at 12:12 AM.
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
All new Hitachi J50 and K135 for sale! Sound of Silence Swap Meet 2 1st April 2011 08:44 AM
Need K135 Have new J50's for trade or $$ Zero Cool Swap Meet 6 8th February 2008 08:33 PM
LL1660, a match for SK135/J50? Jay Solid State 13 9th October 2005 05:02 PM
j50+k135 mosfet replacments themadhippy Parts 9 6th January 2003 08:13 PM


New To Site? Need Help?

All times are GMT. The time now is 04:38 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2