400Watt PA "SAFARI" - 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 October 2012, 12:23 AM   #1
Riff is offline Riff  Indonesia
diyAudio Member
 
Riff's Avatar
 
Join Date: Dec 2011
Default 400Watt PA "SAFARI"

how to increase power from this amp.
Can I get a 500watt of these pa by replacing the final transistor using 2sc5200/2sa1943 x4?
  Reply With Quote
Old 7th October 2012, 12:25 AM   #2
Riff is offline Riff  Indonesia
diyAudio Member
 
Riff's Avatar
 
Join Date: Dec 2011
powerampocl400w.jpg
  Reply With Quote
Old 7th October 2012, 12:40 AM   #3
diyAudio Member
 
moschfet's Avatar
 
Join Date: Jul 2008
Location: Hannover
Quote:
how to increase power from this amp.
It is not so easy as it seems.
Quote:
Can I get a 500watt of these pa by replacing the final transistor using 2sc5200/2sa1943 x4?
No!
__________________
Regards http://xipix.de/
  Reply With Quote
Old 7th October 2012, 12:50 AM   #4
Riff is offline Riff  Indonesia
diyAudio Member
 
Riff's Avatar
 
Join Date: Dec 2011
Quote:
Originally Posted by moschfet View Post
It is not so easy as it seems.

No!
what are you suggestion?
  Reply With Quote
Old 7th October 2012, 02:42 AM   #5
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
That circuit is awful. If you want 500W for PA, you really want something rugged with 5x MJ15003/4 or MJ15024/5 with MJE15032/3 driver transistors. It will have to run reliably on 80V supplies.

You can use 2n5551 for inputstage, mje340/350 for vas. You will need a big heatsink, maybe fan cooled. After all that, you may find it was cheaper to buy a readymade PA amp. Maybe if you can get a scrapped one for the case and heatsinks it is worth it.
  Reply With Quote
Old 7th October 2012, 03:07 AM   #6
Riff is offline Riff  Indonesia
diyAudio Member
 
Riff's Avatar
 
Join Date: Dec 2011
Quote:
Originally Posted by jaycee View Post
That circuit is awful. If you want 500W for PA, you really want something rugged with 5x MJ15003/4 or MJ15024/5 with MJE15032/3 driver transistors. It will have to run reliably on 80V supplies.

You can use 2n5551 for inputstage, mje340/350 for vas. You will need a big heatsink, maybe fan cooled. After all that, you may find it was cheaper to buy a readymade PA amp. Maybe if you can get a scrapped one for the case and heatsinks it is worth it.
MJ15003/4 or MJ15024/5 is too expensive on my local market...so how if i use 2sc5200/2sa1943 x5?
I've tried the sircuit using 2SC5200/2SA1943 x4 and given the supply 75vdc...for test load 4R 15"+12" device...
  Reply With Quote
Old 7th October 2012, 03:10 AM   #7
Riff is offline Riff  Indonesia
diyAudio Member
 
Riff's Avatar
 
Join Date: Dec 2011
Default MJ15003/4 or MJ15024/5

i mean MJ15003/4 or MJ15024/5 is hard to find and even if there is very expensive on my local market,
  Reply With Quote
Old 7th October 2012, 02:09 PM   #8
diyAudio Member
 
JOHN BALI's Avatar
 
Join Date: Jun 2010
Location: Near the Mountain
Hi Riff
This circuit maybe can stand higher voltage if we change some part value...
I'm also curious which one should be changed or how to modified this circuit???
maybe add VBE TR, add TEF etc.

So someone please give suggestion, which component should be changed to
stand up to +/- 70VDC & the power transistor will be 2SC5200/2SA1943.
Please tell us how many output pairs should be use?


Regards
__________________
Thank you, I wish you happy
peace & G B U

Last edited by JOHN BALI; 7th October 2012 at 02:16 PM. Reason: word to arranged better
  Reply With Quote
Old 7th October 2012, 02:10 PM   #9
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
That amplifier will be about 60W/8Ω on a typical 40V supply.

Whoever labeled it 400W was demented/on drugs, etc.
__________________
Candidates for the Darwin Award should not read this author.
  Reply With Quote
Old 7th October 2012, 02:23 PM   #10
diyAudio Member
 
moschfet's Avatar
 
Join Date: Jul 2008
Location: Hannover
Quote:
That amplifier will be about 60W/8Ω on a typical 40V supply.
Yes, with an 8 ohm sense resistor. At a speaker, it is probably a bit more:
80-90Watt

But 400Watt I also can not see...
__________________
Regards http://xipix.de/
  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
"State of the art" in DIY PA speakers? Racket Scientist Multi-Way 4 16th December 2010 08:01 PM
"Converting" a stereo speaker to PA monitor Racket Scientist PA Systems 3 28th October 2010 08:08 AM
"F400" 400W PA with IRFP240/IRFP9240 Ermac Solid State 5 25th July 2009 07:06 PM


New To Site? Need Help?

All times are GMT. The time now is 01:02 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