Sounds like a muting relay sticking.
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@dweller I have deduced with further testing that the problem is temp related. If I remove the cover and allow more ventilation the problem does not occur. Once the cover is put back on 15 mins later its back so I am thinking a resistor that is sensitive to heat or maybe a cap. Should be an easy fix as the problem is easily reproduced. I found a guy here in Atlanta that specializes in tube gear and I am going to drop it off today. I will report back on what the problem turns out to be.. thanks for all the replies.
Instead of using the mute when silencing the output,you should just switch to another source on your preampThe mute circuit in ARC preamplifiers is also part of the component's protection system. If you don't have a properly functioning mute circuit, you're losing a margin of safety.
Hi Yogiboy. Yea with my other Phono stage that does not have a mute button I just simply roll the volume down. The mute button is very nice to have especially since it has a remote as well. Its not a show stopper however if its a bad circuit I am concerned that it could also cause other things to fail as well. Especially if its a bad Cap, so just to do my diligence I would like to get it resolved, but I appreciate the idea. Thanks
The mute button does work. it actually works a little to good lol.. This problem happens when I "unmute" but I get where your coming from. If the mute feature has any time of problem its not a good thing as the unit stays in mute during warmup to not allow you to use it till the tubes have gone past a certain power up.
I dropped it off at my local guys shop yesterday and we discussed this. It is one of the approaches he is going to take. Hopefully by cooling down whatever component is causing the problem will make for a faster turnaround. Otherwise he will have to trace it down with a meter which will take a little longer. We will see. One of he problems is that if I have the lid off it does not get hot enough to cause it to fail. The good thing is that once it's in the failed state it stays that way until you recycle power. I have a feeling that he will have to trace the schematic and determine where the culprit is.