Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

My Transistors, original or copy?
My Transistors, original or copy?
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 27th June 2014, 07:36 AM   #551
obscurus is offline obscurus
diyAudio Member
 
obscurus's Avatar
 
Join Date: May 2013
hfe ~ 170 -> ok since it is grade E (100 - 200).
And you are right, V collector breakdown > 200V means it is different to test for me.

I concern about this trans because Sanyo seem usually use print with white text, not laser print like of me. My friend have a pair of used 2SC3117/2SA1249 from Sanyo, look the text on body like this pic.

Click the image to open in full size.
  Reply With Quote
Old 27th June 2014, 11:14 AM   #552
AndrewT is offline AndrewT  Scotland
R.I.P.
 
Join Date: Jul 2004
Location: Scottish Borders
For a test voltage of > 250Vdc, you will need a very much higher value current limit resistor.
Maybe 100k, to prevent destruction of the DUT, when it begins to avalanche.
__________________
regards Andrew T.
  Reply With Quote
Old 19th July 2014, 06:21 AM   #553
Chris Goldring is offline Chris Goldring
diyAudio Member
 
Chris Goldring's Avatar
 
Join Date: Jan 2012
Hi!

Are these real K135/J50?

They are from the ebay seller "polida2008".

Yes, they are Abused, tortured and tested hardly! They seem to be equal to the datasheet. But might be a renamed exicon perhaps?
Attached Images
File Type: jpg IMG_9834.jpg (468.7 KB, 347 views)
File Type: jpg IMG_9829.jpg (517.6 KB, 342 views)

Last edited by Chris Goldring; 19th July 2014 at 06:23 AM.
  Reply With Quote
Old 19th July 2014, 07:08 AM   #554
davada is offline davada  Canada
diyAudio Member
 
Join Date: Jul 2004
Location: Fort St John, BC Canada
Quote:
Originally Posted by Chris Goldring View Post
Hi!

Are these real K135/J50?

They are from the ebay seller "polida2008".

Yes, they are Abused, tortured and tested hardly! They seem to be equal to the datasheet. But might be a renamed exicon perhaps?
What year is the date code on those? 4J2.

The print look authentic. Try removing it with lacquer thinner.
__________________
David.
  Reply With Quote
Old 19th July 2014, 07:20 AM   #555
Chris Goldring is offline Chris Goldring
diyAudio Member
 
Chris Goldring's Avatar
 
Join Date: Jan 2012
Yes. I have 4J2, 2A9, 9513 on the "2SJ50" and 3J1, 1022 on the "2SK135"

I tried with acetone and the 2SK135 doesn't loose it's painting. However if i rub hard enough some of the "2SJ50" loose it's painting, not much but it does.
  Reply With Quote
Old 19th July 2014, 07:26 AM   #556
davada is offline davada  Canada
diyAudio Member
 
Join Date: Jul 2004
Location: Fort St John, BC Canada
Quote:
Originally Posted by Chris Goldring View Post
Yes. I have 4J2, 2A9, 9513 on the "2SJ50" and 3J1, 1022 on the "2SK135"

I tried with acetone and the 2SK135 doesn't loose it's painting. However if i rub hard enough some of the "2SJ50" loose it's painting, not much but it does.
It shouldn't. Try the thinner.
__________________
David.
  Reply With Quote
Old 19th July 2014, 11:48 AM   #557
AndrewT is offline AndrewT  Scotland
R.I.P.
 
Join Date: Jul 2004
Location: Scottish Borders
The To3 backplate looks quite thick.
Is it steel or aluminium?
__________________
regards Andrew T.
  Reply With Quote
Old 19th July 2014, 11:58 AM   #558
basreflex is offline basreflex  Spain
diyAudio Member
 
Join Date: Oct 2007
package is very prone to destroy the fets by ESD.

the unwrapping alone is risky.
try to squeeze alu foil through the pins, through the wrap. then cut stuff loose..
  Reply With Quote
Old 19th July 2014, 12:06 PM   #559
Chris Goldring is offline Chris Goldring
diyAudio Member
 
Chris Goldring's Avatar
 
Join Date: Jan 2012
I know, that's the package i received them in! (not good at all)

The backplate is magnetic (like everything on these FETs) so i guess i's steel and not aluminium.

I tried with some "White spirit" and the markings stayed. I have no thinner :/
  Reply With Quote
Old 19th July 2014, 01:36 PM   #560
kevinkevin is offline kevinkevin  United Kingdom
Account disabled at member's request
 
Join Date: Mar 2014
'Polida2008' !!

I've had fakes from them before .

Kevin
  Reply With Quote

Reply


My Transistors, original or copy?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
NTE transistors-->> Backwards from original case layout!! What the heck! 777funk Solid State 1 10th May 2009 03:49 AM
Need DVD copy software! Kyte_08 The Lounge 7 16th February 2008 02:48 PM
how to backup original cd as the same sound quality as original cd ctrn Music 3 16th May 2006 05:21 PM
Copy of Kore-Eda pre ? sinski Chip Amps 2 4th May 2006 01:03 PM


New To Site? Need Help?

All times are GMT. The time now is 04:34 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki