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Odd problem with TT setup...

I’ve got an SME 30/2 TT with the Gold V tonearm. Recently, I’ve noticed on a few albums with particularly punchy kick drum passages (The Police Zenyatta, Talking Heads Slippery People particularly) that on occasion I hear a distinct “pop” as if overdriven during these notes. But not every time in the song, nor on every song.. The odd thing is, it doesn’t matter what I change... my typical cart is an Atlas, but it has also done it with other carts, namely a Sumiko Blue #2 MM. Capacitance settings don’t change the problem, I’ve tried cable swaps on both ends, different phono stages, gain settings, loads etc. it happens in any channel on my Hegel regardless of volume, it happens if I run straight into my head phone amp with headphones. The ONLY constant here is the tonearm. All of the setup parameters are spot on, I’ve tried a variety of VTA settings, antiskate you name it. Is it possible the internal wiring of the tonearm can have a problem? Overall the sound is excellent, great soundstage, overall presentation etc. with the exception of this one issue. Any ideas?
geof3
rauliruegas
13,129 posts
 
geof3 : I mentioned the cartridge because here in Agon an Atlas owner had aproblem and after more than 200 posts the OP took my advise about and guess what? The Atlas was the problem even with not so high hours and its problem was at random too.

Btw, Why dead silence about your day by day phono stage? or Hegel already has PS ?

Anyway, up to you.

R.


big_greg
6,723 posts
 
What phono stage? 
millercarbon's avatar
millercarbon
12,531 posts
 
Is it more of a pop or a knock? If the bearings got worn/damaged/out of adjustment enough then when the energy from the kick drum gets there it bounces out of contact and when it comes back would knock, like I guess you would call this bearing chatter. Which I never heard but would think something like this could happen. Except I would expect it to be more of a knock or click or something rather than a pop.

A pop to me is more of an electrical kind of thing. But all the electrical glitches I've heard in situations like this the sound cuts out it doesn't pop. So this is a good little puzzle you got here. 


mijostyn's avatar
mijostyn
8,570 posts
 
First, are you absolutely sure it happens in conjunction with sharp transients like kick drums. Does it occur with anything else.
The Atlas should be ok in that arm but I would like to see at least 2 grams added to the headshell. I think, but I am not sure that the Atlas is nowhere stiff enough to get the resonance point that high. But ruling that out is easy. Just for fun add 2-3 grams to your head shell and sell what happens. Soundsmith makes a set of variable mass screws. 
But assuming that is not it, and please do not make assumptions, You have condensed it down the the arm. That table is perfect for a Kuzma 4 Point. The Atlas loves the 4 Point.
geof3 OP
1,129 posts
 
@Raul it’s not the cart. I’ve now tried my Atlas, two Sumitomo MC’s (high output) and now, for kicks, I tried a demo Ortofon MM... all the same. My current PS is a Simaudio Moon 5.3LP, I’ve tried a 310, I’ve tried 3 Lehmann’s Cube, Cube SE and Decade, I’ve tried McIntosh’s newest PS. All the same. A variety of cables of all levels... I’m completely stumped.

@Millercarbon, the sound is that if an overdrive. It is definitely distortion of some sort. Both channels, primarily right, I’ve tried antiskate settings from zero to “3” on the V... no idea...
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