Stolen Trademark Amplifier from Jim's Audio on EBAY - Page 28 - 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 7th August 2012, 09:15 AM   #271
spurlte is offline spurlte  United States
diyAudio Member
 
Join Date: Aug 2011
Default Heat Sinks Price

Quote:
Originally Posted by Nico Ras View Post
Jozua, I use tunnel heat sinks from Semicron. Call Ivan at 031 463 3245 they will cut to length and surface them.
How much for, let us say, a 20CM length? I would have to have, what, 8 pieces. Then shipped to the U.S.
  Reply With Quote
Old 7th August 2012, 12:58 PM   #272
diyAudio Member
 
Kaplaars's Avatar
 
Join Date: Jul 2010
Location: Wageningen
Spurtle; anodising gives electrical isolation, but it also can give better C/W values, so heat can be transfered better than non-anodised aluminum. Especially when you use black coating, it sounds strange, but having a black surface gives better heat emission than blank metal, but it does not improve heat emission that much, it is about 1%.

Aluminum is a bit self anodising, it almost instantly forms an oxidelayer at the top (Al2O3). That is why aluminum normally does not rust, but..... this oxidelayer is very thin. Anodising it gives a thicker, and thus better electrically isolating, layer. And with anodising you can give it other colors.

Jozua you can try local radio flee markets. Although now I think about it, distances between cities in South Afrika are probably far much greather than here in Holland I have bought a lot of nice stuff cheap from this markets. Almost every year I go with my father to Rosmalen. Great radio flee market for radio amateurs. There are even people from Poland which go to this market. Made a picture two years back:

Click the image to open in full size.

It is almost like walking into a candy store to me when I visit here
__________________
Michael van den Born - PA4MW
  Reply With Quote
Old 7th August 2012, 03:58 PM   #273
diyAudio Member
 
Nico Ras's Avatar
 
Join Date: Nov 2005
Location: East Coast of South Africa
Quote:
Originally Posted by spurlte View Post
How much for, let us say, a 20CM length? I would have to have, what, 8 pieces. Then shipped to the U.S.
Spurtle, I think these heat sinks originate from your neck of the woods. I will get Ivan's email and you can negotiate directly.
__________________
Kindest regards
Nico
  Reply With Quote
Old 7th August 2012, 04:02 PM   #274
diyAudio Member
 
Nico Ras's Avatar
 
Join Date: Nov 2005
Location: East Coast of South Africa
Kaplaars, yes distances are a little more here, Jozua lives about a two hour flight from where I am.
__________________
Kindest regards
Nico
  Reply With Quote
Old 7th August 2012, 04:16 PM   #275
diyAudio Member
 
Nico Ras's Avatar
 
Join Date: Nov 2005
Location: East Coast of South Africa
This is what the heat sink looks like, Flat sheets of aluminium (0.5mm thickness) slots into the sink all round to form the enclosed funnle or chimney and a 6" fan bolts to the end of the funnel.

The one shown is about 8" in length and converts to around around US$50. I think it will be better looking for this profile in the USA now you have an idea what it looks like.

I will do a search as well. These heat sinks are generally used for high power switching electronics such as SCRs and diodes and I would say it is an industry standard rather than something exotic.

It is fairly simple to bolt things to the heat sinks by means of the channels provided.
Attached Images
File Type: jpg 151.jpg (164.6 KB, 451 views)
__________________
Kindest regards
Nico
  Reply With Quote
Old 7th August 2012, 04:39 PM   #276
Jozua is offline Jozua  South Africa
diyAudio Member
 
Join Date: Aug 2003
Location: Cape Town
Thanks Nico !

I phoned this afternoon but Ivan is only back next week ! But if there is interest we can assist other prospective buyers and possibly get a better price? I will definitely follow up next week.

I have been holding back with this project as I prefer the compactness of the tunnels despite the disadvantages of the long wires.

Of course on a big heatsink one could use flatpack transistors with shorter wires which I am told are much better.

Regards

Jozua
  Reply With Quote
Old 7th August 2012, 05:29 PM   #277
spurlte is offline spurlte  United States
diyAudio Member
 
Join Date: Aug 2011
Default Heatsinks

Quote:
Originally Posted by Nico Ras View Post
Spurtle, I think these heat sinks originate from your neck of the woods. I will get Ivan's email and you can negotiate directly.
Thanks, I was going to build my own, but don't think I would create the needed surface area. I am almost finished with KSA-100.
  Reply With Quote
Old 7th August 2012, 09:03 PM   #278
neychi is offline neychi  Croatia
diyAudio Member
 
Join Date: Feb 2005
Location: zagreb
Quote:
Originally Posted by spurlte View Post
Why anodize? Is this for aluminum? I quess this is why Kaplaars used a copper bar for the smoother caps connections. I went to a scrap yard today and found some similar heat sinks for the output drivers. I wish someone could explain about why some are using "live" heatsinks for the TO-3s and how to get by without using such "live" setup. I will post a photo of these heatsinks ASAP.

David, I want to have all the heatsinks in the same color. That's why I will give them to the black anodizing.

More progress...
Attached Images
File Type: jpg Speak_protect.jpg (51.3 KB, 425 views)
__________________
Best Regards
  Reply With Quote
Old 7th August 2012, 09:24 PM   #279
spurlte is offline spurlte  United States
diyAudio Member
 
Join Date: Aug 2011
Default Heat Sinks

Quote:
Originally Posted by Nico Ras View Post
Spurtle, I think these heat sinks originate from your neck of the woods. I will get Ivan's email and you can negotiate directly.
Here in this Chicago, Illinois, USA? Wouldn't that be miracle?
  Reply With Quote
Old 7th August 2012, 09:29 PM   #280
spurlte is offline spurlte  United States
diyAudio Member
 
Join Date: Aug 2011
Default 2SC2238

neychi, you were able to see that I had counterfeit 2SA968s. Can you look at these 2sc2238?
Attached Images
File Type: jpg 2SC2238.JPG (707.7 KB, 411 views)
  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
Jim's Audio F5 power supply board Hikari1 Pass Labs 35 4th December 2013 10:41 PM
Jim's Audio Goldmund Telos 390 clone Tyimo Solid State 9 5th March 2013 02:28 AM
Jim's Audio F5 referenced kit. HiVi Guy Pass Labs 21 22nd November 2012 10:24 AM
Stolen items? kctess5 Multi-Way 14 23rd February 2012 10:02 PM


New To Site? Need Help?

All times are GMT. The time now is 04:33 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