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Headshell/tonearm hum due to dirty or loose connection?

yeah, basically you put it back to stock. I got the same problem when I tried adding a ground wire without doing it the proper way. I took my wire out and left it alone.
 
Blue Shadow said:
You had a ground loop with both grounds hooked up and it only took us a few posts for you to find the time to get inside again and poke around. We are tough taskmasters at time, not knowing the time available for those doing the work. But you got that cover off, looked over the issue and got the unit hooked up correctly for use with the new receiver. Enjoy!!
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Yep. What threw me was the fact that I'd tried it before without the external ground, and I swear there was noise. No idea what that was. In any case, getting that cover off showed the obvious ground loop issue. So, yeah... all good!
 
OK... I may have spoken too soon. I'm still noticing a hum when you crank it up. It's waaaay lower than before, but it's still there. And... it goes away significantly if you move the receiver away. So, would that be transformer hum? Is there any way to shield for it? Here's how I'm set up at the moment. I really don't want to move my receiver if I don't have to.

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I also noticed that the ground lead and RCA connects seem quite frayed, and I’m wondering if maybe there’s a slight short or something if you breathe on it funny. Who knows?
 
bscepter said:
Plus - it definitely wasn’t there when I “fixed” it at lunch.
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Off-topic, but I just realized that we both have Dynaco A25s and Ortofon Cartridges. I have an Ortofon VMS 3E on my TD 145 and an Ortofon F15E on my Sanyo. Both are from the VMS series and sound great with the Dynacos.

Is the hum in both channels or just the right?
 
Isaac C. said:
Off-topic, but I just realized that we both have Dynaco A25s and Ortofon Cartridges. I have an Ortofon VMS 3E on my TD 145 and an Ortofon F15E on my Sanyo. Both are from the VMS series and sound great with the Dynacos.

Is the hum in both channels or just the right?
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Both channels. And, yes - I love the sound of the Dynacos!
 
Never put a turntable with a cartridge on top of a unit with a big transformer. Just asking for hum.
 
I absolutely never stacked the tt on components, ever. Folks do it but if you don't have to, it eliminates a possible hum infiltration question.
 
So does your terminal connection look like the picture you posted earlier, or did you perform the hum mod like I did in the picture I posted?
 
OK: update 3 - I jacked the ground wire around at the back of the deck and... the hum is gone. So I’m guessing it’s a dodgy internal connection. Sorry for being a pain in the arse!
 
Now it gets weirder. The hum is back - but intermittent. I now don’t think it has to do with the turntable at all. Here’s the thing: it’s not there when I first switch on the receiver. But after a while it shows up. Or doesn’t. It seems random. But if it does show up and I shut off the receiver and turn it back on, it goes away again. Does this sound like a failing transformer?

Btw, the turntable is plugged into the switched outlet on the back of the receiver.
 
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May be some old components in the receiver. Don't think its a transformer problem. More a cap issue.
 
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