Hello all
Could anyone, please, give me some clarity on this issue ?
The schematics is for the Input Stage only of the AW65.
Power Supply is -+47Volts.
The offset measured at OUT drifts with temperature from - 10Volts to +3Volt after 2 minutes.
The temp of Q8-Q9 reaches 63ºC.
The calculated current on Q9 (Vce 36V) collector is 23mA for a dissipation of 800 mW.
Does it all make sense ?
I have doubts that the offset should drift so much.
I heard that Electrocompaniet amps dissipate a lot of heat, maybe that's why the fault on this amp destroyed so many transistors, they work at such Hi Temp.
Many Thanks
Rollo
Could anyone, please, give me some clarity on this issue ?
The schematics is for the Input Stage only of the AW65.
Power Supply is -+47Volts.
The offset measured at OUT drifts with temperature from - 10Volts to +3Volt after 2 minutes.
The temp of Q8-Q9 reaches 63ºC.
The calculated current on Q9 (Vce 36V) collector is 23mA for a dissipation of 800 mW.
Does it all make sense ?
I have doubts that the offset should drift so much.
I heard that Electrocompaniet amps dissipate a lot of heat, maybe that's why the fault on this amp destroyed so many transistors, they work at such Hi Temp.
Many Thanks
Rollo
Attachments
Hi,
you can check the one I have here http://www.diyaudio.com/forums/showthread.php?s=&threadid=25386&perpage=10&highlight=&pagenumber=2
Btw you seem to miss the protection / servo boards... the photos I made show that these are marked "AW-65"... let me guess... does your amp come from a "official" EC repairer in Meda?
If so both you and my friend (the owner of the amp) have ben screwed by the same guy....
Cheers
Andrea
you can check the one I have here http://www.diyaudio.com/forums/showthread.php?s=&threadid=25386&perpage=10&highlight=&pagenumber=2
Btw you seem to miss the protection / servo boards... the photos I made show that these are marked "AW-65"... let me guess... does your amp come from a "official" EC repairer in Meda?
If so both you and my friend (the owner of the amp) have ben screwed by the same guy....
Cheers
Andrea
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