genewoodall
Active Member
Hello:
I just purchased a MAC 4275. I would not have considered this model, but It is near mint cosmetically and I got it very cheap knowing that it has an intermittent problem which is crackling and channel dropout in the left channel. It does this on either speaker 1 or 2 taps.
The dropout/noise shows up randomly and giving the volume control several quick turns gets rid of it, usually for a listening session. I have cleaned the volume control.
It works perfectly as a preamp tuner hooked up to another amp via preamp out and sounds surprisingly good. No dropout whatsoever.
When listening t the headphones I get the dropout, but it goes away when I disengage the speaker tap button.
I think the speaker relay is the next suspect. I have cleaned the controls but I can’t find the speaker relay although I can hear it. I am afraid it is hidden between two boards and could be a really tough one to get to, dealing will all the ribbon connectors.
Anyone ever dealt with this problem or have an idea as to where the relay is located?
Thanks
Gene
MC 7200, MC 2120, MR 78, C 30, MAC 4275
I just purchased a MAC 4275. I would not have considered this model, but It is near mint cosmetically and I got it very cheap knowing that it has an intermittent problem which is crackling and channel dropout in the left channel. It does this on either speaker 1 or 2 taps.
The dropout/noise shows up randomly and giving the volume control several quick turns gets rid of it, usually for a listening session. I have cleaned the volume control.
It works perfectly as a preamp tuner hooked up to another amp via preamp out and sounds surprisingly good. No dropout whatsoever.
When listening t the headphones I get the dropout, but it goes away when I disengage the speaker tap button.
I think the speaker relay is the next suspect. I have cleaned the controls but I can’t find the speaker relay although I can hear it. I am afraid it is hidden between two boards and could be a really tough one to get to, dealing will all the ribbon connectors.
Anyone ever dealt with this problem or have an idea as to where the relay is located?
Thanks
Gene
MC 7200, MC 2120, MR 78, C 30, MAC 4275
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