Help? Problem With Holding The Groove On A Hot Pressing


I have had a problem holding the groove on several hot pressings and it always occurs in the same spot. I am not sure if it’s my set up or a mastering error.

I am playing a record with very strong sonics that is in Mint condition and midway through the last track it skips. When I look at the area under a strong glass I can see a very hot bass transient that almost collides with the next groove. This happened again tonight when I was playing a first pressing/orignal release of MJ’s Thiriller. It also happened on a Allman Brothers LP as well as one other.

Is this a mastering error or is my TT and cartridge not up for it? I am using a Technics 1200 with an Ortofon Blue cartridge. I have checked the setup several times with a very accurate gram scale (2.5g) and my Geodisc. Should I try for a different cartridge angle geometry?
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Showing 9 responses by voiceofvinyl

I find it unusual that the overly hot groove would occur in almost the exact same spot on multiple pressings. I’m wondering if it has something to do with the mastering process?
Thanks. I have adjusted the counterweight +\- .5g and it doesn’t fix the problem. I’m leaning to thinking it might be related to overhang?
Also try without anti-skating (and don’t use more that the tracking force)


@chakster Thanks. Backing completely off the anti-skating allows the cartridge to hold the hot groove.

I am still curious about why these hot grooves appear in the last tracks of some LP’s. I read somewhere that some mastering engineers would back off on the bass in the later tracks because of the changes in record speed or cartridge geometry that occurs as the record plays through a side and some, like George Piros (re: Led Zep II first release) would cut hot all the way through. I was trying to find the article and I can’t...

Is there any plausibility that these hot grooves found later in a side would be a result of the physics of cutting? It is intuitive to me that for any same low frequency that the groove would present as a slow "hill" in the outer grooves because of the faster speed and more of a shorter "peak" in the slower inner grooves?
Thank you professor Millercarbon for shutting down a dialogue and keeping me on point.
@almarg Thank you for the procedure. I will try that.

Thankfully there are a few people in this group who aren’t crippled with toxic self-absorption.
@ mijostyn.
Thanks. I have a few test and set up records inluding the Hi Fi News Analogue Test lp. I will go through it again and test for wobble and warble.

I am also going to slowly add some anti-skating until I get to the point where I start to miss-track a highly modulated low frequency trace (hot groove). Then I will try Almarg’s approach to obtain a median setting. 

Also....
Does cartridge offset that does not meet ideal have anything to due with miss tracking behavour like I am experiencing? I am trying to figure out if I need a headshell that will allow me to change the offset angle of the cartridge body. I currently cannot change the cartridge offset angle. 

@ o_holter
Thanks. 98% of the occiasional skips I find are the result of some kind of condition flaw or pressing flaw.

In a few rare cases, such as this one and a few others, there was no condition issue. I had to look at the grooves with a strong loop to see that the cause was a very modulated groove in the last track that ejected my cartridge. 
Hi again

I ran all the tests using a HI Fi News test record. I was especially interested in the lateral and vertical resonant frequency test. Both number ranges I got put the cartridge in the sweet spot now that I have the anti-skating set just slightly below the tracking force. The vertical and lateral resonance doesn't quite match though. 

My question is; how do you "adjust" the resonant frequency? My current values for vertical are: 15 Hz - 7Hz. My lateral values are 14 Hz - 10 Hz. 

Should I even worry about trying to match the vertical and lateral exactly?

Thanks,
If adding or subtracting small amounts of weight to/from the headshell changes the cartridge resonance, why wouldn't adding or subtracting some tracking force accomplish the same? The physics must be different?