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
A disc that was cut to hot , but still on the level where it is tracable but very close to where there could be mistraking , so it does it sometimes , sometimes it does'nt thus many cartridges you use it does it .
So, an update... yes, there is no doubt these particular albums are hot for sure. I “borrowed” a Rega P3 and plugged it into my system and played the offending albums/tunes... no extraneous pop. So, either the combo of cart/tone arm/whatever on my SME is very, very sensitive and is doing just as mentioned above and possibly mistracking those hot passages, or I have a problem with my tone arm. Here’s a thought... could there be something with my SME power source? A ground problem or some such? 
Most likely its a resonance/vibration problem of some kind. Electrical faults- bad solder joint, frayed or damaged wire - usually results in cut-outs not pops. My first thought was slight bearing wear. Kick drum energy bounces the bearing and when it lands it generates the pop. But that would be more like a knock I would think. 

I can tell you how to test and prove its not internal wire, but you won't like it, way too complicated. To check the bearing/compliance/resonance idea place some small mass at the pivot point, adjust VTF, and play. To check compliance add a mass of a few grams like a penny or dime, stick on top of the cartridge with Blue-tack or tape. Anything temporary just to check the theory. Its unlikely, but so is everything else at this point, sad to say.
@MC... I did try the mass thing last night as suggested above, just to see. I added 2 grams of blue tac, no luck. I’m going to mess with it a bit more this weekend... maybe I get lucky. Otherwise, I’m going to just throw in towel and enjoy what I’ve got and maybe see about sending the tone arm into SME. Its about 12 yrs old give or take. Could prob use a service anyway...
Dear @geof3 : 12 years on that SME tonearm?, I assume you are the original owner. I don't know if the internal wiring in that tonearm is the same of more contemporary samples and if not then could be a good time for SME rewires it and at the same time can gives a check up to its overall specs, especially the bearings.

Now the V is a tonearm balanced design and the best way to use it is not in balanced way but in static way. Do you already did it ? if not rigth now is time to do it along its silicon damping ( tray. ).

Btw, I know that first than all you need to fix this pop trouble but after that and due to the quality top Atlas performance levels as the Hegel electronics and very good TT/tonearm you should change that good but average/medicre one phono stage that can't honor the true Atlas quality performance that can shows you with a way better phono stage that you can buy from Simaudio due that this Canadian company has very good and high level engeneering.
Your today unit works mainly through op-amps and its overload levels is really low at 2.2db. with a non accurated RIAA eq. for high differences in between both channels.
I know that you like what you are listening ( other than that pop. ) but in reality what you are listening is a " poor " quality against what the Atlas can shows you or to any other audiophile with the rigth phono stage.

With all respect you own a " Ferrari " that is running it with bike tires.

R.