F5 Turbo Builders Thread - Page 123 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 2nd February 2013, 12:21 PM   #1221
Nikitas is offline Nikitas  Greece
diyAudio Member
 
Join Date: Nov 2011
Location: Amsterdam
Hi all,
I'm building an f5t v2, and in the process of testing i managed to fry the fairchilds....Now I'm waiting for replacements. Looking to my stuff this morning i found a quad of 2SK1530 2SK201 toshibas. I read somewhere,don't remember where though, that these thingies could replace the fairchilds.

So, just out of curiocity, has anybody tried these?Any major differences in sound?
I'm thinking, since, i'm waiting and have nothing to do, try them. Any thoughts on what i should change on the boards? I've everything set for fairchilds at the moment.

I would appreciate any recommendations/ideas.
  Reply With Quote
Old 2nd February 2013, 12:50 PM   #1222
Rush is offline Rush  United States
diyAudio Member
 
Join Date: Sep 2009
Location: Tampa, Florida
Quote:
Originally Posted by Odysseas View Post
Hi all,
I'm building an f5t v2, and in the process of testing i managed to fry the fairchilds....Now I'm waiting for replacements. Looking to my stuff this morning i found a quad of 2SK1530 2SK201 toshibas. I read somewhere,don't remember where though, that these thingies could replace the fairchilds.

So, just out of curiocity, has anybody tried these?Any major differences in sound?
I'm thinking, since, i'm waiting and have nothing to do, try them. Any thoughts on what i should change on the boards? I've everything set for fairchilds at the moment.

I would appreciate any recommendations/ideas.
Nelson Pass discusses the 2SK1530/2SJ201 in the original F5T article. I used them in one of my original F5 and they sound great.
Later in the F5T thread Nelson mentioned 2SK1529/2SJ200 as having less input capacitance and is a good option as well for the F5T. Neither of these will pass the current of the Fairchild devises. All of these are no longer in production.

Rush
  Reply With Quote
Old 2nd February 2013, 01:25 PM   #1223
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
THey will work great and will plug directly in with little effect. Just look up their datasheet and try to get an idea of the VGs needed for the bias you want. Before plugging them in, set your pots below that point about 25%-50%. You have tested you FE and all is good. As long as you mount and isolate them correctly, you should be able to listen within the day.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 2nd February 2013, 01:54 PM   #1224
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Quote:
Originally Posted by Rush View Post
2SK1529/2SJ200 as having less input capacitance is a good option as well for the F5T, these are no longer in production.
Oh dear, what a shame.
__________________
The buck stops Here
  Reply With Quote
Old 2nd February 2013, 01:57 PM   #1225
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
I would love to get my hands on some. If only....
__________________
...Shape the sound , Man!
  Reply With Quote
Old 2nd February 2013, 02:49 PM   #1226
dazed2 is offline dazed2  Canada
diyAudio Member
 
Join Date: Jun 2010
Location: Toronto
I have the 1530/201 in mine. I tried the Fairchild's as well.
Personally I like the toshibas more than the Fairchild's. Seems more musical.

However as buzz says make sure you turn down the bias pots before turning it on. As they bias a lot lower than the Fairchild's.
  Reply With Quote
Old 2nd February 2013, 02:58 PM   #1227
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
As well as having slightly lower C, I believe it is a little more linear in nature. No different than caps. Different flavor of ice cream.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 2nd February 2013, 03:38 PM   #1228
Nikitas is offline Nikitas  Greece
diyAudio Member
 
Join Date: Nov 2011
Location: Amsterdam
So, 0,2-0,25V across the 0,5 Ohm resistance I should be ok for burn in,right?
  Reply With Quote
Old 2nd February 2013, 03:45 PM   #1229
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Please restate what you mean. You should get about .300-.400mV across the source resistors. It looks like the Vgs should be in the range of 2-2.5V
__________________
...Shape the sound , Man!
  Reply With Quote
Old 2nd February 2013, 03:54 PM   #1230
Nikitas is offline Nikitas  Greece
diyAudio Member
 
Join Date: Nov 2011
Location: Amsterdam
the rating of voltage at 300-400mV across source resistors is for the fairchilds. Having to be more conservative with the toshibas, i'm thinking of 200-250mV across the R source.
I can't find a clear enough datasheet for the toshibas to take a look at graphs.

BTW did you manage to send the package?
  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
F5 Turbo Circuit Boards chchyong89 Pass Labs 2356 12th September 2014 07:50 PM
B1 builders thread Bas Horneman Pass Labs 696 14th July 2014 12:57 PM
F5 Turbo is posted Nelson Pass Pass Labs 635 6th April 2014 10:51 AM
F5 turbo problems Rob Dingen Pass Labs 17 11th January 2013 08:38 PM
F5 Turbo ............. if only !!!!!! a.wayne Pass Labs 23 21st January 2012 02:24 AM


New To Site? Need Help?

All times are GMT. The time now is 10:07 AM.


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