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Old 8th April 2013, 09:39 AM   #11
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Hello andrewlebon,

What's your opinion, comparing it to Vertex, seems you have made it too, the previous years.

Regards,

Angeltech
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Old 8th April 2013, 12:05 PM   #12
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I think their schematics like Crest CA9, 12, 18 but cut off class G cascode stage.
Fully complementary input, darlington Vas and triple EF3 output.
Some pro-amp in my country like this, they used +/-95VDC rail. But output devices are 2SC5200/2SA1943 (ON semi devices not sell in my country, if you want use it, shipping from Digikey or Mouser, and prices are expensive.)
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Old 8th April 2013, 03:05 PM   #13
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Hello Walkalone,

Do you have schematics of this amps? the original Crest is quiet complicated. to much for DIY....

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Angeltech
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Old 8th April 2013, 03:39 PM   #14
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Quote:
Originally Posted by angeltech View Post
Hello Walkalone,

Do you have schematics of this amps? the original Crest is quiet complicated. to much for DIY....

Regards,

Angeltech
I don't have detail schematic of Crest CA class AB. But like i said, they're simply original Crest class G and cut off cascode stage in output stage.
Crest CA9, CA12, CA18... all they're class G.
We know, class G is a cascode stage, upper in class B output stage.
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Old 9th April 2013, 11:19 AM   #15
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Hello andrewlebon,

You can trace the original board for a schematics, anyway hows the opeartion of it?

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Angeltech
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Old 9th April 2013, 04:42 PM   #16
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Default ca 9

Quote:
Originally Posted by andrewlebon View Post
TRYING to clone it will use MJL4281 and its complement
warm regards
andrew lebon
plz can u give the diagram of ca 9 china amp.
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Old 9th April 2013, 08:28 PM   #17
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nyce work
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Old 10th April 2013, 01:40 AM   #18
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You can trace the original board for a schematics, anyway hows the opeartion of it?
Hello Angeltech
greetings yes traced orignal boards sound is very clear and powerful
has vi limiter and all protections once amp is working new compact pcb will be designed
stay tuned little busy with some amps
warm regards
andrew lebon
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Old 10th April 2013, 02:53 PM   #19
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Sounds interesting....

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Angeltech
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Old 4th May 2013, 05:47 AM   #20
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Hi Sameerx1
greetings need you to design pcb for led display clip temp signal CLONED pcb
is workng GR--- if time permits we could do a full test on sunday
warm regards
andrew lebon
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