It played flawlessly since the rebuild a couple of years ago. Last week I noticed a slight hum.
The hum comes from both channels, is not volume dependent (doesn't get louder when I turn up the volume), and is present on all seven selector positions (phono, aux, fm, etc...).
The unit was rebuilt a couple of years ago with a full kit from Jim McShane. Attached is the kit list of parts that went in, and a pic of what came out.
Only the four output tubes have been replaced from the original Fisher 7591 to EH7591. All the other tubes were not touched as they tested fine at the time of the rebuild.
Thoughts?
Edit: I did a search on AK (with Google) but couldn't find anything similar to what I have described above.
The hum comes from both channels, is not volume dependent (doesn't get louder when I turn up the volume), and is present on all seven selector positions (phono, aux, fm, etc...).
The unit was rebuilt a couple of years ago with a full kit from Jim McShane. Attached is the kit list of parts that went in, and a pic of what came out.
Only the four output tubes have been replaced from the original Fisher 7591 to EH7591. All the other tubes were not touched as they tested fine at the time of the rebuild.
Thoughts?
Edit: I did a search on AK (with Google) but couldn't find anything similar to what I have described above.
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