Crescendo ME (component) question..

[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..

[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

[Nico Ras]

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

[Dxvideo]

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.

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.

[Nico Ras]

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

[Nico Ras]

Ozgur,

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

Kindest regards

Nico

[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..

[Dxvideo]

Dear Nico,

Am I making a mistake or this amp has a 180° phase error on 1Khz???

[ilimzn]

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).

[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?