Quad 34 radio input R channel problem

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21-Sep-2017 03:50 PM

Lingo

Lingo

Posts: 27

My Quad 34's radio input in right channel has big electric noise during music playing especially turn volume higher. I follow the upgrade way by Dada and recap all electric capacity . I also try to change all 4066 ic to max 4066 cpd or philips 4066 bp, but total  useless. I also check PCB path very carefully but no broken sign. If use CD or Tape input then no problem. I almost give up. Can help me please?

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22-Sep-2017 03:17 AM

EJP

EJP

Posts: 1412

The radio input goes straight into the nearest 4066. All the other inputs go via an opamp. So there is very little in the signal path that could cause this. I would swap the 4066 with another one and see if the problem moves, and if not check the soldering of that 4066, or its socket if you used a socket, and also check it is inserted correctly, with no bent legs etc.
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