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Old 12th September 2010, 05:40 PM   #1
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Default Studio Reference Amplifier

APEX SR100 Studio Ref Amp
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Last edited by apexaudio; 12th September 2010 at 05:48 PM.
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Old 12th September 2010, 05:49 PM   #2
wahab is offline wahab  Algeria
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Interessant schematic, Apex...
Shouldn t Q6 base rather go to Q3 collector
and Q5 base to Q4 collector ?...
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Old 12th September 2010, 05:54 PM   #3
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Originally Posted by wahab View Post
Interessant schematic, Apex...
Shouldn t Q6 base rather go to Q3 collector
and Q5 base to Q4 collector ?...
Wahab, you are faster than usual, thank you
Regards
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Old 12th September 2010, 11:04 PM   #4
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I use PCB from old DC Servo Mosfet Amp for test this circuit, after basic tests amp work on my desk without case on +/-45V DC rail voltage. Sound is without any compromise, and musicans like it.
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Old 13th September 2010, 11:23 AM   #5
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Circuit can work with IRFP240/IRFP9240 (R30-10k, without C10,C11-100pF). Zobel network with 10R, 22nF and 4R7,10uH is on PSU pcb. MJE340/MJE350 must have heatsink (10mA), amp can work with +/-90V DC rail voltage with more outputs (R20,R21,R22,R23-100k instead 47k, R24-12k/1W instead 6k8).

Last edited by apexaudio; 13th September 2010 at 11:27 AM.
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Old 14th September 2010, 10:24 PM   #6
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Wiyh this PSU amp rail voltage can be set and will be stabilized. 2SA1943/2SC5200 must have heatsink.
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Old 16th September 2010, 09:06 AM   #7
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This is my amp from 80', modular drivers and protect pcb only caps is too big to be fit on amplifier motherboard. I considering to use this design for 'Studio Reference Amp'.
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Old 16th September 2010, 11:08 AM   #8
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Wiyh this PSU amp rail voltage can be set and will be stabilized. 2SA1943/2SC5200 must have heatsink.
nice PSU very simple. how much ampere it can handle?
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Old 16th September 2010, 11:16 AM   #9
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nice PSU very simple. how much ampere it can handle?
Single pair in PSU can suply two pairs in amp output, it's simple.
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Old 16th September 2010, 12:17 PM   #10
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Output voltage with this PSU can be set from 35V to 65V 5A with single pair 2SA1943/2SC5200.
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