With my Timestep headshell and Benz Micro LP-S my tracking weight is very near the end of its adjustment, which is to be expected based on the specifications I think it is within 2gm of the limit.
A simple think to try out would be to get a small amount of blu-tack say 3-4gm and out it onto the counter-weight, them balance out the arm, zero the gauge and the then set it for your tracking weight and then see it it remains stable.
Before you do the above see if you can easily slide the counter-weight back, you should not be able to do so if it engaged on the thread, so if it isn't then you have exceeded what it can do with the existing counter-weight.
Listening is the act of aural discrimination and dissemination of sound, and accepting you get it wrong sometimes.
Analog Inputs: Pro-Ject Signature 10 TT & arm, Benz Micro LP-S, Michel Cusis MC, Goldring 2500 and Ortofon Rondo Blue cartridges, Hitachi FT5500 mk2 Tuner
Digital:- Marantz SA-KI Pearl CD player, RaspberryPi/HifiBerry Digi+ Pro, Buffalo NAS Drive
Amplification:- AudioValve Sunilda phono stage, Krell KSP-7B pre-amp, Krell KSA-80 power amp
Output: Wilson Benesch Vector speakers, KLH Ultimate One Headphones
Cables: Tellurium Q Ultra Black II RCA & Chord Epic 2 RCA, various speaker leads, & links
I think I am nearing audio nirvana, but don’t tell anyone.
if its partially off the stem that will cause issues with it moving.. meantime try a little plumbers tape. might just give it enough grip
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Interesting conundrum, and I agree that the cart. cannot be responsible except inasmuch as it may generate a lot more energy that your others.
I had the same thing happen on my 12" PU7, when the VTF would inexplicable change (can't remember if it was lighter or heavier though). The P U7's counterweight is secured by grub-screws, and although feeling tight, they weren't, causing drift over a few records.
Don't know your Jelco, but think it may be a grooved/twist affair with no locking, but the principle remains and I think Adrian, Martin et al are on the right track in suggesting masking tape or whatever to secure it. Sounds improbable for such a counterweight to be able to creep, but this and the cart. weight/higher VTF/energy effect on the counterweight is at least a feasible possibility.
Thanks - Yes I agree it must be the counterweight slipping. Hugo Cass informed me earlier there is no heavy counterweight available and I’ve not seen anything from the likes of Isokinetic. I’ll try the “tape” method at some stage and if successful maybe try and commission a custom weight.
Thanks to all the ghost busters
Steve
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Always a little further
Listening is the act of aural discrimination and dissemination of sound, and accepting you get it wrong sometimes.
Analog Inputs: Pro-Ject Signature 10 TT & arm, Benz Micro LP-S, Michel Cusis MC, Goldring 2500 and Ortofon Rondo Blue cartridges, Hitachi FT5500 mk2 Tuner
Digital:- Marantz SA-KI Pearl CD player, RaspberryPi/HifiBerry Digi+ Pro, Buffalo NAS Drive
Amplification:- AudioValve Sunilda phono stage, Krell KSP-7B pre-amp, Krell KSA-80 power amp
Output: Wilson Benesch Vector speakers, KLH Ultimate One Headphones
Cables: Tellurium Q Ultra Black II RCA & Chord Epic 2 RCA, various speaker leads, & links
I think I am nearing audio nirvana, but don’t tell anyone.
Might be obvious but I assume the sleeve is fully on the arm and that the weight is towards the rear of the sleeve. Ie you don't have the weight forward and the sleeve hanging off the back....