Studio Reference Amplifier - Page 99

Arif Budiyanto · 8th December 2012, 05:09 AM

Quote:

Originally Posted by apexaudio

High power version, but not tested.

Many thanks..Mr. Mile Slavkovic...this SR800 is more powerful...

nazirdigi · 8th December 2012, 11:40 AM

Quote:

Originally Posted by apexaudio

High power version, but not tested.

nice sr800 amp sir,

AndrewT · 8th December 2012, 02:05 PM

Apex,
How have you managed to get high power reliably from the 2sa1943/c5200 when used with +-95Vdc supply rails?

The datasheet shows the 25degC SOA as 40W (421mAdc) and this must be de-rated for Tc > 25degC.

The same datasheet shows 1A for 100ms @ 84Vce.
A 5pair output stage will have a 100ms maximum current capability of 5Apk when @ 85Vce.

This transistor is very low power at high voltages.
To me, it seems to be the wrong transistor to select for the +-95Vdc supply rails, that you specify.

apexaudio · 9th December 2012, 02:20 AM

Quote:

Originally Posted by AndrewT

Apex,
How have you managed to get high power reliably from the 2sa1943/c5200 when used with +-95Vdc supply rails?

The datasheet shows the 25degC SOA as 40W (421mAdc) and this must be de-rated for Tc > 25degC.

The same datasheet shows 1A for 100ms @ 84Vce.
A 5pair output stage will have a 100ms maximum current capability of 5Apk when @ 85Vce.

This transistor is very low power at high voltages.
To me, it seems to be the wrong transistor to select for the +-95Vdc supply rails, that you specify.

Andrew, what transistors you suggest for output stage?

AndrewT · 9th December 2012, 11:08 AM

Any of the >=150W Onsemi or Sanken would do the SOA job far better.

But that does not answer my question.

How did you make the amplifier reliable with 1943/5200?

apexaudio · 11:54 AM

Quote:

Originally Posted by AndrewT

Any of the >=150W Onsemi or Sanken would do the SOA job far better.

But that does not answer my question.

How did you make the amplifier reliable with 1943/5200?

I don't use 2SA1943/2SC5200 for SR800, I use MJW21195/MJW21196. I just notice 2SA1943/2SC5200 on schematic as most popular outputs useing in diy amplifiers.

AndrewT · 9th December 2012, 11:59 AM

MJW have a very different SOA.

Quote:

How did you make the amplifier reliable with 1943/5200?

coolet · 9th December 2012, 12:00 PM

small mods to accomodate 10uF cap... very nice sounding little beast

apexaudio · 9th December 2012, 12:49 PM

Quote:

Originally Posted by coolet

small mods to accomodate 10uF cap... very nice sounding little beast

Nice work, thanks.
Regards

44250 · 9th December 2012, 01:30 PM

Quote:

Originally Posted by AndrewT

MJW have a very different SOA.

Quote:

Originally Posted by AndrewT

Any of the >=150W Onsemi or Sanken would do the SOA job far better.

But that does not answer my question.

How did you make the amplifier reliable with 1943/5200?

+1

Does the same thing applies to a SR200,MJL/W21193/94 instead 2SA1943/2SC5200? SOA for those two (pair of) transistors are very different at most critical points,that really should be said and underlined when amplifiers of that power are being represented to a public that beleives in you and does your designes with great enthusiasm and strong beleife in you and your work up till now.

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8th December 2012, 02:05 PM	#983
AndrewT Sin Bin Join Date: Jul 2004 Location: Scottish Borders	Apex, How have you managed to get high power reliably from the 2sa1943/c5200 when used with +-95Vdc supply rails? The datasheet shows the 25degC SOA as 40W (421mAdc) and this must be de-rated for Tc > 25degC. The same datasheet shows 1A for 100ms @ 84Vce. A 5pair output stage will have a 100ms maximum current capability of 5Apk when @ 85Vce. This transistor is very low power at high voltages. To me, it seems to be the wrong transistor to select for the +-95Vdc supply rails, that you specify.

9th December 2012, 11:08 AM	#985
AndrewT Sin Bin Join Date: Jul 2004 Location: Scottish Borders	Any of the >=150W Onsemi or Sanken would do the SOA job far better. But that does not answer my question. How did you make the amplifier reliable with 1943/5200?

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