Keystone CL-60...How Hot Should It Get? - 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 21st December 2002, 12:49 AM   #1
diyAudio Member
 
Join Date: Sep 2001
Location: Salt Lake City
Default Keystone CL-60...How Hot Should It Get?

I just received my bag-o-CL60's today and tried one in series with the transformer. Zowie Passmen....it runs at over 100 deg. C. ! I felt that was way too hot so I put two in parallel and things dropped to about 85 deg C. on each device. Is this too hot or should they be series connected?
Thanks!
Mark
  Reply With Quote
Old 21st December 2002, 12:52 AM   #2
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
When I first put them in my Aleph X they were smoking and smelling. 100 deg is fine, if you connect them in series, it won't change the temperature.

They good up to 170 deg C http://www.thermometrics.com/assets/images/cl.pdf
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 21st December 2002, 01:30 AM   #3
diyAudio Member
 
Join Date: Sep 2001
Location: Salt Lake City
Then 2 in parallel seems the best way to go which is what I thought. 85 deg C. is better than 100! Also 2 give half the resistance when hot and the main fuse still holds fine. We'll see after repeated use about the fuse as my xformer and caps are larger than the factory units had in them. I suppose another way around the heat generator is to short it with a small relay 5 or 10 sec. after turn on. At least I can remove the giant variac from my bench till amp #2 is finished....hopefully this weekend.

Mark
  Reply With Quote
Old 21st December 2002, 01:38 AM   #4
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
I wouldn't connect them in parallel, because it also reduces the resistance when cold and inrush limiting properties are not that good then. If you are afraid of heat the best way is to use relay which will short the thermistor after turn on.

I use to use CL-40 in my A75 amp and quite often I had a bridge failure. So now I'm using 2 CL-70 in my Aleph X and this should give me peace of mind about those soft recovery discreet diodes. The resistance when cold is 30ohm, when hot the voltage drop is negligable. They are so hot that you can't touch them, One other solution is to glue small heat sink using epoxy and this should lower temperature somewhat.
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 22nd December 2002, 05:21 PM   #5
fezz is offline fezz  United Kingdom
diyAudio Member
 
Join Date: Feb 2002
Location: milton keynes, UK
i was wondering what makes these current inrush limiters so special?

i am considering getting a inrush limiting thermistor for my zen amplifer which uses a 300va transformer on 230v, can i get away with a 2A thermister, but most importanly, why does everyone use this type of thermistor? and am i ok with a 'gerneric' one?
  Reply With Quote
Old 22nd December 2002, 05:33 PM   #6
Banned
 
Join Date: Apr 2002
Location: Germany, Clausthal
We use this CL60 because Nelson does so.

I use an old thermistor i don´t know the type in one amp and it works perfectly, also an other thermistor i bought at conrad elektonik worked.
  Reply With Quote
Old 22nd December 2002, 05:44 PM   #7
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
You need about 10ohm resistance when cold.
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 22nd December 2002, 06:02 PM   #8
fezz is offline fezz  United Kingdom
diyAudio Member
 
Join Date: Feb 2002
Location: milton keynes, UK
Quote:
Originally posted by Peter Daniel
You need about 10ohm resistance when cold.
well, i have a choice of:

8R 2A
20R 2A

but what i would really like to know is if the 2A is enough or do i need more (possably less) i am using a 300va transfomer on a 230v supply so i should be getting around 1.4A
  Reply With Quote
Old 22nd December 2002, 08:31 PM   #9
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
The thermistors used in Alephs are rated 5A, but since you are using 230V your current is half of what we got in America, so I imagine 2A should be fine. If you want more inrush supression you can use 20R.
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 22nd December 2002, 08:58 PM   #10
diyAudio Member
 
Join Date: Sep 2001
Location: Salt Lake City
Be sure to buy a thermistor with the correct temperature coefficient characteristics......one that lowers its
resistance when hot!!
Mark
  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



New To Site? Need Help?

All times are GMT. The time now is 01:41 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