Pioneer Series 20 Ring emitter transistor recommendations needed - diyAudio
Go Back   Home > Forums > Design & Build > Parts

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

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 22nd December 2005, 05:56 PM   #1
diyAudio Member
 
Join Date: Jan 2004
Location: usa
Default Pioneer Series 20 Ring emitter transistor recommendations needed

Hello everybody!
I have a dead Pioneer series 20 A27 amplifier in need of output transistors (I suspect that the series 20 m25 amplifier utilizes the same) .
They are 2sa1003 and 2sc2323 ring emitter transistors (to-3 case). I haven't been able to find any info or substitutions for these parts.

Googling around I found the following Ring Emitter transistors...

sanken 2sa1494 and 2sc3858
or
"super linear" 2sa1943 and 2sc5200
or
"the ultimate audio power transistor" 2sa1216 and 2sc2922

Would any of the above be a suitable replacement?

Does anyone out there have any data on the 2sa1003 and 2sc2323 ring emitter transistors? Or any recommendations to overcome this quandry?

Thanks, Ted
  Reply With Quote
Old 22nd December 2005, 06:16 PM   #2
diyAudio Member
 
Bernhard's Avatar
 
Join Date: Apr 2002
Location: Munich
Are you sure the RETs are dead ?
I have a M25, RETs are MN25 and MP25.
  Reply With Quote
Old 6th January 2006, 08:10 AM   #3
diyAudio Member
 
Join Date: Jan 2004
Location: usa
Hi Bernhard,
Thanks for your reply.
I took them out and measured them ... a few are shorted.
Cheers, Ted
  Reply With Quote
Old 6th January 2006, 09:06 AM   #4
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
Default Re: Pioneer Series 20 Ring emitter transistor recommendations needed

Quote:
Originally posted by brothelthug
2sa1003 and 2sc2323 ring emitter transistors (to-3 case).
The data:

Vcb/Vce max=150 volts
Ic max=12 amps
Ft= 20 MHz
Hfe = 50-200. 100 typical.
Pt = 120 watts
Manufacturer= Fujitsu

If it is possible to change to a different case i'd go for the Sanken 1216/2922, you will not find TO3 multi emitter devices.
__________________
No More Mr Nice Guy
  Reply With Quote
Old 6th January 2006, 09:10 AM   #5
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
You don't have to use ring emitter types as replacements. Choose from the ones you listed that have the same case style, they are all good.

Watch out for fakes, be careful where you buy from.

It would also be worth replacing the driver transistors as failed output devices often take out or at least damage the drivers.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 17th May 2006, 01:01 AM   #6
diyAudio Member
 
Join Date: Jan 2004
Location: usa
Thanks for your help!
I'll try some non ring emitter transistors.
Cheers, Ted
  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
four transistor emitter follower (diamond buffer) as power output stage? capslock Solid State 113 12th August 2013 06:16 PM
PowerBase vs LAPT or ring emitter techology roender Solid State 5 22nd December 2007 01:41 PM
Need medium-power transistor recommendations abzug Solid State 4 20th December 2007 01:46 PM
Why are Emitter-resistors needed? Fritzell Solid State 11 5th February 2007 06:04 PM
Transistor and MOSFET recommendations? meretrix Parts 2 24th January 2005 11:45 AM


New To Site? Need Help?

All times are GMT. The time now is 09:10 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