303 quad hum buzz one channel

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04-May-2018 09:36 AM

allanr

allanr

Posts: 2


3 of 4  2000uF caps had low value so replaced with 2200uf 

before replacement left channel loud buzz/hum  

right channel ok ,  any advice were to look to solve [problem

this noise is there with no preamp connect  .  measure dc offset at speaker terminal  basically zero.  

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12-May-2018 03:09 AM

EJP

EJP

Posts: 1529

It will be the left front electrolytic on the left-hand amplifier board as you look at it opened up with the heatsink on the right. But change all three in both channels.
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12-May-2018 09:02 AM

allanr

allanr

Posts: 2

had ordered caps for the driver board  thanks for you help   cheers allan

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