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 20th February 2012, 11:24 AM   #41
mr l is offline mr l  Australia
diyAudio Member
 
mr l's Avatar
 
Join Date: Dec 2003
Location: frankston VIC
Hi,
The output stage uses MJ15024/25 devices. the transformer has a sticker specifying 500VA, 52 volt output. I measured 73v filtered with about 18mv noise. the capacitors are elna 27000uF 80v (I've built a 50watt, single ended amp that has 188000 uF per 35v rail, now that will generate sparks!). I don't have an LCR meter that measures that high, but after nearly 30 years they could be ready for replacement. I'll test them with a load later.
  Reply With Quote
Old 21st February 2012, 04:57 AM   #42
Butcher is offline Butcher  New Zealand
diyAudio Member
 
Butcher's Avatar
 
Join Date: Oct 2011
Nice big transistors. 250V, 16A. Havent seen those pupy's before. When I forst got my Plinius. One of the channels had a problem. My advice is to chect all other components (semis and resistors) as it is probably DC coupled. I found some leaky transistors in mine . Also emiter resistors worth checking/replaceing before replacement of the o/p transistors (expensive).
  Reply With Quote
Old 14th July 2012, 11:02 PM   #43
diyAudio Member
 
Join Date: Apr 2005
Location: Wellington
Bringing this thread back from the dead!

I just saved a Plinius II, III and IV combo from the scrap pile.
A quick look in the poweramp suggests it needs a rebuild.

The preamp psu uses the same mj15003/15004 used as the poweramp outputs.

Thanks for the schematic, Butcher.
  Reply With Quote
Old 16th July 2012, 08:40 AM   #44
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Quote:
Originally Posted by cubastreet View Post
Bringing this thread back from the dead!

I just saved a Plinius II, III and IV combo from the scrap pile.
A quick look in the poweramp suggests it needs a rebuild.

The preamp psu uses the same mj15003/15004 used as the poweramp outputs.

Thanks for the schematic, Butcher.
Really from a scrap pile similar like this ??
https://www.ameslab.gov/files/imagep...-heap-copy.jpg
This is really amazing.

The use of bjt power output devices for discrete serial regulators is really nothing special. But if there is in use parallel regulators for the pre amp section, then it would be no ordinary.
Schematics would be interesting in any case.
  Reply With Quote
Old 16th August 2012, 06:02 AM   #45
Butcher is offline Butcher  New Zealand
diyAudio Member
 
Butcher's Avatar
 
Join Date: Oct 2011
Good luck with that restoration!
  Reply With Quote
Old 6th September 2012, 09:19 AM   #46
diyAudio Member
 
Join Date: Sep 2012
Hi tony can ihave a copy of the schematic?
mcseatmore@gmail.com

thank you very much
  Reply With Quote
Old 7th September 2012, 05:13 AM   #47
Butcher is offline Butcher  New Zealand
diyAudio Member
 
Butcher's Avatar
 
Join Date: Oct 2011
Um, It would help if the email address is functional! "mcseatmore@gmail.com"

Anyhow mate, look back i this thread as I have already posted it!

Tony.
  Reply With Quote
Old 21st September 2012, 03:16 AM   #48
jrapley is offline jrapley  New Zealand
diyAudio Member
 
Join Date: May 2007
Hi Tony
If it wouldn't be too much trouble I would also very much like a copy of the Plinius II schematic.
jonathanrapley1@hotmail.com

Thanks
  Reply With Quote
Old 10th October 2012, 11:46 AM   #49
Butcher is offline Butcher  New Zealand
diyAudio Member
 
Butcher's Avatar
 
Join Date: Oct 2011
Done!
  Reply With Quote
Old 10th October 2012, 01:40 PM   #50
Macleod is offline Macleod  France
diyAudio Member
 
Join Date: Dec 2008
Location: Toulouse, south of France
Has anybody already tried to play with such Triple CFP? Any simulation to show how to make it without oscillation? My first attempts are already bad at simulation level with common modern BJT...

It would be very intersting to be able to use this topology as the bias is very stable as mainly dictated by pre-driver vbe.

Any recommandation?

What is the goal of R35 R36?
Attached Images
File Type: jpg Plinius%20Amp%20-%20Schematic%20ORIGINAL.jpg (514.4 KB, 248 views)

Last edited by Macleod; 10th October 2012 at 01:44 PM.
  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
80 Watt class-b amp 'L6' Ver 5.0 nyqxmfj Analog Line Level 2 30th November 2009 06:13 AM
2500 watt class AB hienrich Solid State 21 4th October 2007 10:03 AM
Class AB Amplifier USFishin Solid State 1 28th March 2004 03:25 PM
Questions about how to decrease the PASS A-40 amplifier into a class AB amplifier. novtango Pass Labs 2 21st October 2002 01:50 AM


New To Site? Need Help?

All times are GMT. The time now is 05:15 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