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Old 8th December 2012, 04:09 AM   #981
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High power version, but not tested.
Many thanks..Mr. Mile Slavkovic...this SR800 is more powerful...
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Old 8th December 2012, 10:40 AM   #982
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High power version, but not tested.
nice sr800 amp sir,
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Old 8th December 2012, 01:05 PM   #983
AndrewT is online now AndrewT  Scotland
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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.
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Old 9th December 2012, 01:20 AM   #984
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Originally Posted by AndrewT View Post
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?
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Old 9th December 2012, 10:08 AM   #985
AndrewT is online now AndrewT  Scotland
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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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Old 9th December 2012, 10:51 AM   #986
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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.

Last edited by apexaudio; 9th December 2012 at 10:54 AM.
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Old 9th December 2012, 10:59 AM   #987
AndrewT is online now AndrewT  Scotland
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MJW have a very different SOA.
Quote:
How did you make the amplifier reliable with 1943/5200?
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Old 9th December 2012, 11:00 AM   #988
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small mods to accomodate 10uF cap... very nice sounding little beast
Attached Images
File Type: gif SR50old.GIF (64.3 KB, 828 views)
File Type: jpg sr50new.JPG (558.9 KB, 796 views)
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File Type: pdf SR50 Track.pdf (41.5 KB, 228 views)
File Type: pdf SR50 Parts.pdf (78.2 KB, 211 views)
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Old 9th December 2012, 11:49 AM   #989
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small mods to accomodate 10uF cap... very nice sounding little beast
Nice work, thanks.
Regards
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Old 9th December 2012, 12:30 PM   #990
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Thumbs up good question

Quote:
Originally Posted by AndrewT View Post
MJW have a very different SOA.
Quote:
Originally Posted by AndrewT View Post
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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