Pictures of your diy Pass amplifier - Page 216 - 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 25th July 2013, 02:58 PM   #2151
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
Since we are dissecting Walters build to a minute level - I'm curious about this transistor. Just have never seen that shape before.
Attached Images
File Type: jpg Thermally coupled JFETs (1).jpg (76.3 KB, 914 views)
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 25th July 2013, 03:00 PM   #2152
diyAudio Member
 
Join Date: Dec 2009
Location: stadskanaal
looks almost like some kind of heatsink around the transistor.
  Reply With Quote
Old 25th July 2013, 03:03 PM   #2153
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
Now that you say that - it sure does. Interesting.
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 25th July 2013, 03:06 PM   #2154
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
Looks like a metal condom (and a used one on top)
__________________
The buck stops Here
  Reply With Quote
Old 25th July 2013, 03:08 PM   #2155
diyAudio Member
 
Join Date: Dec 2009
Location: stadskanaal
a metal condom??? yeah whell, what the heart is full of right.

but i see copper and on the left side corner i see a cut in the material, that is what got me thinking of a heatsink.
  Reply With Quote
Old 25th July 2013, 03:30 PM   #2156
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
So, it's a DIY heatsink for a TO92.

Check my pictures on the Pumpy thread for serial manufacture ones (also copper)
__________________
The buck stops Here
  Reply With Quote
Old 25th July 2013, 03:54 PM   #2157
WalterW is online now WalterW  Netherlands
diyAudio Member
 
Join Date: Oct 2012
Location: Utrecht
Hahaa, it's a DIY heatsink for two TO92's

The 2sj74 and the 2sk170 are thermally coupled that way... a bit... best I could do...
__________________
Pass F5, F5Tv3, ACA, Aleph J, DDDAC1794, DCB1, BA3-preamp, VFET CSX1.
  Reply With Quote
Old 25th July 2013, 03:58 PM   #2158
diyAudio Member
 
BobEllis's Avatar
 
Join Date: Sep 2003
Location: Upstate NY
Quote:
Originally Posted by jacco vermeulen View Post
BOBBY

You of all folks should know how much vibration several thousands of diesel kW's, at say 2100rpm, can facilitate.

Example of a 60 KW/ton (shaft power/displacement), 45kn top speed screamer from the early '90s.
Structural damage level from excitation forces, led to a few hundred thousand dollars costs in testing & engine room modification.
Plenty of solid copper in those locations, at acceptable vibration levels, easily survive the W6 stretch.

Flexible leads is more of a convenience issue.
Thanks for putting the "problem" in perspective, Jacco. I've been out of that business too long.
  Reply With Quote
Old 25th July 2013, 06:21 PM   #2159
diyAudio Member
 
Join Date: Dec 2009
Location: stadskanaal
Quote:
Originally Posted by WalterW View Post
Hahaa, it's a DIY heatsink for two TO92's

The 2sj74 and the 2sk170 are thermally coupled that way... a bit... best I could do...

nice. i don't know when or where, but i remember seeing aluminum blocks for thermal coupling of 2 TO92's. face to face, back to back and face to back, they had them all.
  Reply With Quote
Old 25th July 2013, 06:30 PM   #2160
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 WalterW View Post
a DIY heatsink for two TO92's)
My mistake, then it's a twin sleeping bag (and a used one on top)
__________________
The buck stops Here
  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
DIY Low Pass and Mid/High Pass (Bass Blocking) Filters runslikealpaca Everything Else 1 19th June 2009 10:59 PM
Naked pictures of Pass Pete Fleming Pass Labs 30 9th December 2006 06:39 AM
My new hifi amplifier (pictures) Wejp Chip Amps 23 15th October 2004 12:16 AM
Pass Diy High Low Pass Please macka Pass Labs 127 2nd March 2004 11:00 PM
DIY Pass labs 100watt amplifier. microwalsh8504 Pass Labs 12 6th February 2004 07:27 PM


New To Site? Need Help?

All times are GMT. The time now is 04:56 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