2. amps-preamps
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What might cause LOUD hum in a Conrad Johnson pv6

The PV6 today blared out a loud hum after it had been running fine for a couple of hours. I shut off all power to the amp, pre-amp, tuner etc. I noticed when I moved the preamp that one of the output cables was disconnected.
I don't know if it somehow disconnected and it caused a hum or became disconnected when I moved the pre-amp. In anycase, I later plugged the cables back in securely and used only a tuner STILL A HUM then a turntable and STILL A HUM.

I am looking for someone who might have an idea what is causing the hum. I opened the preamp No smell all tubes appear to be working. So I am puzzled.
randall
randallvar

Showing 1 response by sonofnorway

sonofnorway
62 posts
 
Another possibility -

The original hum may have been from a loose RCA cable to the amp. If the center pin was making contact, but the outer outer ring was not, that would cause a (very) loud hum. Are you sure all cables are firmly reconnected? Could be a bad connection inside a cable, also. Try swapping in some other cables.
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