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Old 28th November 2006, 08:38 PM   #11
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Default Well exercise testic are considered good food by some

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Old 29th November 2006, 05:29 AM   #12
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Old 14th December 2006, 07:04 AM   #13
rehad is offline rehad  Turkey
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Default Classe Audio Seventy Output Schematic


I have explored the Classe Audio Seventy and I have found the darlington transistor 2n6426 was malfunctioning. I couldn't find the 2n6426 in the local electronic shops so i have replaced it with the similar transistor BC517. It is now working well . I have adjusted the bias resistor for an idle current of 150 mA . I am not sure about this setup but i think it's not bad.

Has anyone have an idea about the idle current of Classe Seventy ?

Below is the output stage schematic of Classe Audio Seventy that i did explored with a multimeter.

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Old 14th December 2006, 12:05 PM   #14
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I have no idea if this helps or not, but my DR-15 schematic list's the BIAS at 74ma per device!

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Old 14th December 2006, 12:27 PM   #15
rehad is offline rehad  Turkey
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Actually i did the 150 mA bias setup by measuring the current on the +47 Volt power rail . I have tested the amp 4 hours continuous . The output heatsink was near 40 degree . The MJE340 and MJE350 was about 70 degree . May be the 150 mA a little bit high
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Old 1st March 2008, 09:03 AM   #16
posxia is offline posxia  China
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Can someone kindly tell me why most CLASSE AMP,such as DR3 \ Dr9 adj the bias current by NPN Darlington transistor ? not use general npn bjt such as MJE340 , MPS8099 usually?
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