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.

Rega Brio (one channel dead)
Rega Brio (one channel dead)
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 August 2014, 06:50 PM   #21
teledaniel71 is offline teledaniel71
diyAudio Member
 
Join Date: May 2013
Hi,

I need schematic of brio clamshell version, someone has please...

Thanks a lot
  Reply With Quote
Old 3rd June 2015, 02:49 PM   #22
yoyo44 is offline yoyo44  France
diyAudio Member
 
Join Date: May 2015
bjr je recherche une photo de l'arriere d'un ampli brio 1 svp
car le mien a ete bidouille et la bakelite abime
merci a vous
bonne journee
  Reply With Quote
Old 3rd June 2015, 02:55 PM   #23
Cal Weldon is offline Cal Weldon  Canada
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
Rega Brio (one channel dead)


Ceci est un forum anglais. Si vous souhaitez utiliser une autre langue, le poster en anglais ainsi.

This is an English forum. If you wish to use another language, post it in English as well.

yoyo44 via Google Translate:

bjr I want a picture of the back of an amp brilliantly 1 please
because mine was hack and bakelite abyss
thank you to you
good day
__________________
planet10 needs your help:
Let's help Ruth and Dave
  Reply With Quote
Old 3rd June 2015, 04:24 PM   #24
Ian Finch is offline Ian Finch  Australia
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour
Hi yoyo,
You can Google any number of pics of the Brio or any other popular amplifier by simply typing, for example, "Brio Clamshell pics" into your browser. Here's one I found in just a few seconds:

Click the image to open in full size.
__________________
Ian
  Reply With Quote
Old 4th June 2015, 06:22 AM   #25
yoyo44 is offline yoyo44  France
diyAudio Member
 
Join Date: May 2015
Bjr thank you but I look for the arriere of the ampli defuse(unsettle) to see the circuit print of the ampli to see track of the making up(composing) on the bakelite thank you has you
  Reply With Quote
Old 1st October 2015, 04:14 PM   #26
Antoinel is offline Antoinel  United States
diyAudio Member
 
Join Date: Jan 2012
Location: Pennsylvania
Rega Brio (one channel dead)
Linear Audio Vol. 9 [published 1 April 2015] has an interesting article which is entitled A Low Count Audiophile Power Amplifier by Vanderkooy et al. The design of this amp may fit the stated objective.

N.B My apology for putting this note here instead of the thread called Composite Amplifier Design. Please ignore. Thank you

Last edited by Antoinel; 1st October 2015 at 04:18 PM. Reason: tweak
  Reply With Quote
Old 17th June 2017, 10:41 AM   #27
nigel pearson is offline nigel pearson  United Kingdom
diyAudio Member
 
Join Date: Mar 2007
Location: Oxfordshire
If I was teaching audio electronics I might use the PE Texan as a way to teach as much as possible in a short time. Not least star grounding and how an amplifer output stage might have voltage gain. Then biasing and op amp chioce. The final thing would be to ask the students if they could get it to sound good whilst saying why it might be difficult. Most of all how to measure it. An 8 watt Texan might be very OK ( gain of 1 ). I would also say how the PE Orion was the step forward and look that we might try to build it with and without a long tail pair input ( perhaps without would have the sonic advantage ). Then say how the op amp can be used as a preamp device and it's origins in analogue computing ( modern multi meter ). I do like the positioning of the op amp and feedback type ( not the filtering ).

A Paul Kemble web page - Practical Electronics Gemini and Orion amplifiers.

It is a wonder Douglas Self didn't try a little voltage gain in his usual designs if only to say why not ( maybe he did ). I used a gain of 3 and 2SA1962/2SC5242 and LF351/N as what was in the useful box. It all looked very OK on the analyser even into a very reactive load. I don't see the need for higher output stage gain than I used. A gain switch looks an idea ( in my case 1 or 3 ). Hope this gets someones interest and isn't too late. Mine might get used to drive my 15 inch unit that rolls off at 250 Hz.
  Reply With Quote
Old 17th June 2017, 03:54 PM   #28
Ian Finch is offline Ian Finch  Australia
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour
Hi Nigel, I think you'll find DS does discuss CFP designs with gain, generally. I found a page plus schematics in the 5th ed. of his APADH, p 149. He's not particularly averse but concludes that if CFP with gain was a design option, his advice is that you probably don't want to go this way.
__________________
Ian

Last edited by Ian Finch; 17th June 2017 at 04:12 PM.
  Reply With Quote
Old 18th June 2017, 11:20 AM   #29
nigel pearson is offline nigel pearson  United Kingdom
diyAudio Member
 
Join Date: Mar 2007
Location: Oxfordshire
Hi Ian. Seeing as a compound pair even with gain will be highly linear there might be a sweet spot where transfering the gain duty to the output stage seems not a bad idea. I speculate a gain of 3 would be ideal.

Using one of Self's arguements. We only have loop gain to conquer crossover distortion thus we should attempt the highest loop gain which we then control by Cdom ( sorry if that's not exactly his words ) . The compound pair as I think some call the Texan/Brio looks to be the one thing Self should really love. If you stop to think having extra voltage gain at the output is unlikely to make the amplifier more unstable. My instinct is to think the opposite. It seems a shame the early origines and use if the 741 made the Texan a bit of a joke. My tests of the Texan generic concept saw a most unusual trait. It very nearly is a rail to rail design with quite reasonable clipping considering that. As far as I could see the distortion is low right up to that point. I dare say many will hate it for that, maybe even me. I could imagine a low distortion valve preamp would suit it. That is to balance off it's distortion signature. I could imagine issues of slewing might be helped by relaxing the VAS a little. The PE Orion hints at this.
  Reply With Quote
Old 18th June 2017, 07:29 PM   #30
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
I could never get any good stability in an output stage with gain in SPICE when I experimented with all sorts of topologies some years ago, especially not with more modern, faster output devices. It's a pity because using an opamp as the frontend has some definitive appeal.
  Reply With Quote

Reply


Rega Brio (one channel dead)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
Help. dead channel on GFA 555. chucker Solid State 4 17th May 2008 07:45 AM
Dead channel Carlp Tubes / Valves 15 1st February 2007 03:54 AM
2020 T-Amp Kit: One Dead Channel mourip Class D 5 14th February 2006 01:09 AM
HELP with a rega brio! jercab Solid State 1 5th October 2005 01:43 AM
Peavey 8.5C DeAd cHaNnEl Pbassred Instruments and Amps 3 9th May 2005 11:44 PM


New To Site? Need Help?

All times are GMT. The time now is 05:46 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki