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

Solid State Talk all about solid state amplification.

Question about "matched" power transistors
Question about "matched" power transistors
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 15th January 2013, 05:43 PM   #1
clm811 is offline clm811  United States
diyAudio Member
 
clm811's Avatar
 
Join Date: May 2002
Location: Northern California
Default Question about "matched" power transistors

I recently bought some matched pairs of "Genuine" MJL4281A/4302 off eBay. They are identical to some samples I got from ON Semi, so are prob'ly not fakes.

The seller says he used "curve tracer" and "300mA", but that was all he gave.

Each transistor of the pairs had numbers written on them:

The 4281's were marked "136.1 and "136.3"

The 4302's were marked "184.2" and "184.6 "

I'm new to the realm of curve tracers, so I'm not sure what the markings are(Beta?).

Can anybody here tell me? (The seller's english isn't very good).

Thanks,

-Chas
  Reply With Quote
Old 15th January 2013, 06:15 PM   #2
effebi is offline effebi  Italy
diyAudio Member
 
effebi's Avatar
 
Join Date: Nov 2010
Location: Milan
I do not have a crystall ball, but it looks like it is Beta (or hfe) measured at 300 mA collector current.
  Reply With Quote
Old 15th January 2013, 06:34 PM   #3
sreten is offline sreten  United Kingdom
R.I.P.
 
Join Date: Nov 2003
Location: Brighton UK
Hi, that sounds right, given the information, rgds, sreten.

Like types are matched for current sharing, not across types.

Last edited by sreten; 15th January 2013 at 06:37 PM.
  Reply With Quote

Reply


Question about "matched" power transistorsHide 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
Question about "old" technology: the wiiide baffle of the Boston Acoustics "A" series River757 Multi-Way 28 26th September 2015 12:34 PM
"WTB" "The Wire AMP" Class A/AB Power Amplifier based on the LME49830 with Lateral enantra Swap Meet 3 23rd December 2012 06:36 PM
Question about the properties of "matched" tubes skittletata Tubes / Valves 8 18th March 2008 02:37 PM
do matched pair (or maybe a quad) output tubes "aged" at the same rate? jarthel Tubes / Valves 3 9th June 2007 01:05 AM
"Topaz Ultra Isolator" - power plug question Saurav Parts 16 8th September 2004 02:09 PM


New To Site? Need Help?

All times are GMT. The time now is 09:12 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki