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Old 12th January 2012, 09:56 AM   #1
oiphy is offline oiphy  Norway
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Default cayin 270p

Just wanted to share this schema..... I have to of this amps, bought them new for about 15 years ago, and now they produse a low sound in mid and high when idling... caps changing perhaps? any toughts?
they also been to the seller for a upgrade abouth 7-8 years ago... where there was added some transistors and what not... dont know if that really helpt. will post pics on that later. anyone ever owned these amps.. thought on quality?? they served me well, so no regrets, but want to adress the zzzzzzumming when idling. zumming on both amps= same problem? also want to know what the different trimpots r... ie bias, dc and so on
thanks for any input

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Old 25th January 2012, 09:20 AM   #2
oiphy is offline oiphy  Norway
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Old 25th January 2012, 04:07 PM   #3
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The design seems reasonable, I never heard of this manufacturer.

Caps would be the right place to start, the main power supply ones and then the ones following voltage regulators.

Id try put a small value cap of say 47uF accross DW107 zener.
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Old 25th January 2012, 07:26 PM   #4
oiphy is offline oiphy  Norway
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homemodder. producer is cayin sparks.... they do alot of hifi. low cost from china but supprisingly good stuff. .was thinking about the caps. you know what the different trimpots adjust?
regarding zenercap what will be the purpose?

thanks
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Old 25th January 2012, 08:59 PM   #5
jaycee is online now jaycee  United Kingdom
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R106 adjusts DC offset. VR101 adjusts the current in the VAS stage. VR102 adjusts the idle bias current.

A capacitor across DW107 would filter any noise the Zener produces. I would say your issues are caused by capacitors near the end of their life.
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Old 25th January 2012, 09:08 PM   #6
oiphy is offline oiphy  Norway
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jaycee_ thank you
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Old 20th April 2012, 07:15 PM   #7
oiphy is offline oiphy  Norway
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Default recapping

so started the job of recapping when i found this little rascal...
63v on a 75v rail...... think that was a problem
anyhow... now changing to kendeils all over psu.
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Old 20th April 2012, 07:32 PM   #8
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Wut? dual bias circuits?? o_O
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Old 20th April 2012, 07:42 PM   #9
oiphy is offline oiphy  Norway
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Tekko dual bias???
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Old 20th April 2012, 08:46 PM   #10
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The schematic, it has one Vbe multipler between the bases of the driver transistors with the pot for bias adjust, then another fixed Vbe multipler between the bases of the output transistors, something i've never seen before.
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