Crescendo ME (component) question.. - 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 24th November 2007, 08:43 AM   #1
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
 
Dxvideo's Avatar
 
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
Lightbulb Crescendo ME (component) question..

Hi all,

I'd like to make a (pair of) Crescendo Millenium Edition. However I had some problems with fake components in the past.
So I want to have real components in this time. Do you know any good supplier sells,

2SK1530 (Matched)
2SJ201 (Matched)
2SK537 (Matched)
MJE340
MJE350
OP77

Anda another question; May you say something about the Crescendo? Is it worth to make?

Thx..
__________________
Best regards,
Ozgur
  Reply With Quote
Old 25th November 2007, 01:33 AM   #2
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
DXvideo,

It's an old design, not wonderful sounding, I made one in the eighties and modern designs sound better.

If I were you I'd build the Roender design in this forum, or even the Widowmaker design from Bulgaria. Both are truly visionary in my view.

Cheers,

Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 25th November 2007, 08:28 PM   #3
diyAudio Member
 
Nico Ras's Avatar
 
Join Date: Nov 2005
Location: East Coast of South Africa
Default Re: Crescendo ME (component) question..

Quote:
Originally posted by Dxvideo
Hi all,

I'd like to make a (pair of) Crescendo Millenium Edition. However I had some problems with fake components in the past.
So I want to have real components in this time. Do you know any good supplier sells,

2SK1530 (Matched)
2SJ201 (Matched)
2SK537 (Matched)
MJE340
MJE350
OP77

Anda another question; May you say something about the Crescendo? Is it worth to make?

Thx..
Hi Ozgur,

looks like you cannot make up your mind what you want to build. Well here is something else that you can build from your scrap box. I know you have everything you need for this baby and you can easily buld it on proto-board.

This is the classic John Lindsey Hood class A amplifier with a little twist. Instead of BJT I used MOSFETs. Simpler is hard to find and it really has a nice sound. It comes very close to the headphone sound you are looking for.

I think your Wharfdales are pretty efficient and will sound nice with it.

Kind regards

Nico
Attached Images
File Type: jpg jhl mosfet.jpg (36.0 KB, 653 views)
  Reply With Quote
Old 26th November 2007, 07:47 AM   #4
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
 
Dxvideo's Avatar
 
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
Default Re: Re: Crescendo ME (component) question..

Quote:
Originally posted by AKSA
DXvideo,

It's an old design, not wonderful sounding, I made one in the eighties and modern designs sound better.

If I were you I'd build the Roender design in this forum, or even the Widowmaker design from Bulgaria. Both are truly visionary in my view.

Cheers,

Hugh
Hi AKSA,

The Crescendo which I want to make is the new version.. I choose it because its a complete design, with DC servo and all protections. But of course; the result is more important.
So you say, its sound is not as good as they told
Thx.

Quote:
Originally posted by Nico Ras


Hi Ozgur,

looks like you cannot make up your mind what you want to build. Well here is something else that you can build from your scrap box. I know you have everything you need for this baby and you can easily buld it on proto-board.

This is the classic John Lindsey Hood class A amplifier with a little twist. Instead of BJT I used MOSFETs. Simpler is hard to find and it really has a nice sound. It comes very close to the headphone sound you are looking for.

I think your Wharfdales are pretty efficient and will sound nice with it.

Kind regards

Nico
Dear Nico,
Youre right (as usual).. I am still confused. And still have no decision about the power amplifier.
I have a lot of project in my computer. Most of your projects. In fact its too hard to make a decision. Yes its too easy to make a prototype one. But as you know, last months I have a "time problem". So I want to make a final amplifier, which I can use in my living room.
Do you think this amplifier is too simple to give a good result? May be you find that question too stupid. But when I test a simple amplifier then I always disapointed.

Just a question...

Thx.
__________________
Best regards,
Ozgur
  Reply With Quote
Old 28th November 2007, 07:59 PM   #5
diyAudio Member
 
Nico Ras's Avatar
 
Join Date: Nov 2005
Location: East Coast of South Africa
Default Re: Re: Re: Crescendo ME (component) question..

Quote:
Originally posted by Dxvideo


Hi AKSA,

The Crescendo which I want to make is the new version.. I choose it because its a complete design, with DC servo and all protections. But of course; the result is more important.
So you say, its sound is not as good as they told
Thx.



Dear Nico,
Youre right (as usual).. I am still confused. And still have no decision about the power amplifier.
I have a lot of project in my computer. Most of your projects. In fact its too hard to make a decision. Yes its too easy to make a prototype one. But as you know, last months I have a "time problem". So I want to make a final amplifier, which I can use in my living room.
Do you think this amplifier is too simple to give a good result? May be you find that question too stupid. But when I test a simple amplifier then I always disapointed.

Just a question...

Thx.

Dear Ozgur,

What I have learned from you over the past year that we have been friends, (yes believe it one year) that you are a very critical listener and you are not satisfied easily.

Also you have created a problem by your listening to good headphones with class A, that is impossible to beat with anything other than better headphones and better class A. The most important is that you do not wake the new baby

My suggestion to you is and this is my honest suggestion, build DoZ from Rod's pages It cost very little. Then listen to it intensly. You will realise two things, firstly class A sounds very nice and secondly you do not need 100 watts.

Kindest regards my friend

Nico
  Reply With Quote
Old 28th November 2007, 08:15 PM   #6
diyAudio Member
 
Nico Ras's Avatar
 
Join Date: Nov 2005
Location: East Coast of South Africa
Ozgur,

Here is DoZ with a twist. You can use the spare 2SK1058 mosfets you have in your box.

Kindest regards

Nico
Attached Images
File Type: jpg doz with a twist.jpg (22.0 KB, 484 views)
  Reply With Quote
Old 29th November 2007, 08:19 AM   #7
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
 
Dxvideo's Avatar
 
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
Dear Nico,

One year..... I feel we met just two months ago! Thats interesting. And another interesting thing is; you know my everything, as none of my colleauges knows.

Thanks for the advice.. I am sure it has a perfect and transparent sound. But by the time, my amplifier understanding has changed a lot. But I gues its not a HEALTY changing. Because the simple designs doesnt look like me good sounding... But I will try that, because of your advicing.
As I remember its a 8-10W (into 8 ohm) amplifier, I guess it will be enough for a 91dB 6ohm speaker. I have two 24v 4,5A SPMS module, so that means I can make two seperated amplifiers to put behind of my speakers.
I hope I will make that soon. I will be Austria again next week, then I can start a project.

Until the next time, take care of you..
__________________
Best regards,
Ozgur
  Reply With Quote
Old 29th November 2007, 11:13 AM   #8
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
 
Dxvideo's Avatar
 
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
Dear Nico,

Am I making a mistake or this amp has a 180 phase error on 1Khz???
Click the image to open in full size.
__________________
Best regards,
Ozgur
  Reply With Quote
Old 29th November 2007, 11:26 AM   #9
ilimzn is offline ilimzn  Croatia
diyAudio Member
 
Join Date: Feb 2005
Location: Zagreb
Quote:
Originally posted by Dxvideo
Dear Nico,
Am I making a mistake or this amp has a 180 phase error on 1Khz???
No, it's just that most simulators 'fold over' the phase shift at 180 deg, because they work under the assumption that +180 deg = -180deg (which would be true if we were operating along a circle, using regular trigonometry definitions). However, in electronics phase also implies delay, so unlike trigonometry, where A degrees + (N * 360 degrees) = A degrees, regardless of any whole N, in electronics things like 760 degrees phase shift make a lot of sense. Unfortunately, simulators use the trignometric definition when displaying the graph, which tends to give breaks like in your diagram, when there is polarity inversion. You can get the real situation by simply attaching the top part of the curve to the bottom part (shift it down to align), or use a mathematical function to display the graph, or in form of a circuit element to get the required polarity inversion.
Your diagram simply shows you that midband (1kHz) where the amplifier has minimum phase shift, the amplifier actually inverts polarity, which the simulator interprets as a 180 deg phase shift. Nothing to worry about - just reverse the speaker leads, if you want to keep absolute polarity (also referred to as absolute phase sometimes).
  Reply With Quote
Old 29th November 2007, 11:59 AM   #10
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
 
Dxvideo's Avatar
 
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
Hmmm...
But if you take consider, after breaking point on the graph, there are a lot of phase shifts; for example it starts with 180 (on break point) but downs to 100 @ 1Mhz. That means phase response is not linear?
__________________
Best regards,
Ozgur
  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
Pre-amp component question billnchristy Solid State 13 15th August 2008 10:24 AM
Another crescendo ME question kro5998 Solid State 8 5th May 2005 09:44 PM
Question about Crescendo? Eccu Solid State 20 13th May 2004 12:51 PM
Hey Helix... I have one question about Crescendo? Eccu Solid State 29 22nd July 2002 05:18 AM


New To Site? Need Help?

All times are GMT. The time now is 05:22 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