cayin 270p

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oiphy

oiphy

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Joined 2011
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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

Regards
 

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oiphy

oiphy

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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
 
jaycee

jaycee

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Joined 2004
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.
 
oiphy

oiphy

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Joined 2011
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recapping

so started the job of recapping when i found this little rascal... :eek:
63v on a 75v rail...... think that was a problem :)
anyhow... now changing to kendeils all over psu.
 

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