Acoustic Research D400MK II schematic?

janneman · 22nd October 2004, 03:21 PM

Hi all,

My friend just gave me this AR D400MK II class A (I think) power amp. To repair, of course. THEN he wants it back. Sigh.
Anybody has a schematic or knows where I could get one?

Jan Didden

janneman · 22nd October 2004, 05:49 PM

...anyone...?

janneman · 14th November 2004, 11:04 AM

... bump...

janneman · 14th November 2004, 04:53 PM

Forget it - fixed it.
Broken CCS transistor. A 50 Vce transistor on a 70V supply line. I think a transient killed it, as *in operation* the Vce would be just 38VDC. Tricky design...

Jan Didden

22nd October 2004, 03:21 PM	#1
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	Acoustic Research D400MK II schematic? Hi all, My friend just gave me this AR D400MK II class A (I think) power amp. To repair, of course. THEN he wants it back. Sigh. Anybody has a schematic or knows where I could get one? Jan Didden __________________ /Another new issue: Linear Audio Volume 3!

22nd October 2004, 05:49 PM	#2
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	...anyone...? __________________ /Another new issue: Linear Audio Volume 3!

14th November 2004, 11:04 AM	#3
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	... bump... __________________ /Another new issue: Linear Audio Volume 3!

14th November 2004, 04:53 PM	#4
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	Forget it - fixed it. Broken CCS transistor. A 50 Vce transistor on a 70V supply line. I think a transient killed it, as in operation the Vce would be just 38VDC. Tricky design... Jan Didden __________________ /Another new issue: Linear Audio Volume 3!

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