The Very Best Amplifier I Have Ever Heard!!!!

[vitalica]

Excellent job Vitalica!!

Without your experience - I would not be able,Nikosokey
Now I want to use separate power and VAS, looking for a schema...

Thank you!

 

[koldby]

That confirms that Goldmund are using feedback to reduce errors in a high distortion amplifier.

Everybody here knows that one should design for low distortion before applying high feedback.

Andrew do you ever listen to amplifiers?

 

[alex mm]

My Goldmund 's .
Regards,Alex

 

[joshvi]

 

[AndrewT]

Andrew do you ever listen to amplifiers?

Rarely, I listen to audio.

If I have to answer your questions, I will not have the time to do either.

 

[koldby]

Rarely, I listen to audio.

If I have to answer your questions, I will not have the time to do either.

LOL

 

[Nikos]

My Goldmund 's .
Regards,Alex

 

[koldby]

My Goldmund 's .
Regards,Alex

Very nice indeed!
Do you use SMPS?

 

[alex mm]

Very nice indeed!
Do you use SMPS?

No SMPS, only toroidal transformer, in first picture ,and 500VA R-CORE in the second picture .
Regards,Alex

 

[koldby]

Where did you get big R-cores from and how do they perform? Good I guess?

 

[alex mm]

Where did you get big R-cores from and how do they perform? Good I guess?

You, can read from picture, from where ..... They are, special manufactured ,for audio, and perform very well ,without noise and small magnetic loss .
Regards,Alex

 

[Idefixes]

You, can read from picture, from where ..... They are, special manufactured ,for audio, and perform very well ,without noise and small magnetic loss .
Regards,Alex

I can confirm Alex words. I use one of my five collection in NBip build. I will use rest of group in several slewmaster build.

Marc

 

[koldby]

You, can read from picture, from where ..... They are, special manufactured ,for audio, and perform very well ,without noise and small magnetic loss .
Regards,Alex

Thanks Alex.
So you only have about +/- 50V on your ampboards?
No problem then with pretty high bias.
+/- 80 V on the other hand would cause a VERY hot amplifier, don´t you agree?

 

[IanAS]

No, bias current is bias current.

If you increase the voltage you turn down the bias back to your chosen current.

The Perreaux I am repairing has ±115V and is set to only 170mA total per channel = 34mA per pair as it has 10 devices per channel. The heatsinks are about room temp.

 

[koldby]

No, bias current is bias current.

If you increase the voltage you turn down the bias back to your chosen current.

The Perreaux I am repairing has ±115V and is set to only 170mA total per channel = 34mA per pair as it has 10 devices per channel. The heatsinks are about room temp.

I know bias current is bias current , but power consumption is very different with +/- 50V @ 150mA bias and +/- 80V @ 150 mA bias. That was my point.

 

[alex mm]

Picture it's from an old project ,not from Goldmund .....

 

[IanAS]

power consumption

Yes, sorry, my mistake, my brain was off-line at that moment due to a flu or something. After a good sleep I could then again remember and comprehend that the Wattage to be dissipated is derived from the voltage drop across the device x the current through it.

At that impaired moment of typing I was thinking (or not!) that only the current determines the heat, but, of course, the resistive element de-energises the elections higher potential into lower potential, energising the device into becoming warmer and the higher the potential, the greater the de-energising.

 

[keantoken]

What happened to the schematics in the first post of this thread?

 

[AndrewT]

Nagys removed them.

It's a standard problem when Members refuse to attach and instead use a remote server that can go off line.

 

[tommy1000]

Here you have them.