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Another ear 834p troubleshooting question

Hi all

I have spent sleepless nights here, lurking and learning. I bought a used 834p unit last year, but I hadn't much time to listen critically. I am always moving stuff around and noticed a couple of things a couple of nights ago . big hum, mostly coming from right side and, well, a helicopter sound on the left. It happened as a result of me swapping a bunch of tubes back and forth, etc. Been trying differed 12ax7, one 12au7 and others. I eventually noticed that the ear was sitting near and above noise generating units, like Furman power conditioner and my streaming server, sonic transport, basically a small computer. Moving the 834p helped greatly and then I reinstalled the original tdp tubes. This morning the hum and helicopter sounds were gone and I listened for a while . yes there was a lot of gain hiss but not an abnormal amount of hum. Surely, since everything was working well, I was determined to tweak again. I read so much about putting a 12au7 in the v1 socket. I did that and tried different tele 12ax7 in the other sockets. Some of the teles are new, others are nos and used. Surely after, the hum (right side) and helicopter (mostly left) came out to visit. I'm taking a break.

Is this happening because of some capacitor overload and is that how it got better this morning, or do I just have a bunch of incompatible tubes? Also, touching the input cables at the rca base, changed the artifacts a little and can make the helicopter move to the right speaker. My system is marantz clearaudio tt15 with mm virtuoso wood, Octave audio v40 se amp, Quad 2805s.
PD


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Topic - Another ear 834p troubleshooting question - pedroboe 20:41:43 06/26/17 (4)

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