VPI Prime Sig/Lyra Delos / Feedback ...help!

This just in - VPI recommended a continuity test on all headshell wires with multimeter...the white wire seems intermittent...not sure that is the culprit though , I think that's a ground..

@mijostyn l

@larryi

Thanks for the help , however my unipivot w Hana ML never feeds back in exact same position with same isolation feet 🤷

VPI seems to think the tone arm white wire shorting is the culprit 

@larryi 

yeah I get it, I’m gonna try moving around the table today,…

funny how VPI and also Lyra recommend this cartridge with the table and the arm I have 🤔

@karl_desch 

pretty close by but not sure where I could put the TT where it's gonna make any huge difference...only sound isolation is the Prime Signature feet which are padded & fairly good acoustic feet . 

@billstevenson ya , I've already tried putting my old arm with the Hana ML on it on the new deck in same position as the feedback was happening w Lyra & it works 100% perfectly ...must be the Lyra is just SUPER sensitive...

@tablejockey @mijostyn 

guess it wouldn't hurt to pick up the Fatboy Gimbal & A/B...

thanks 

New theory : 

the Lyra cart doesn’t like my phonostage . Allnic 1202 ohms aren’t jiving and it’s making the Delos work too hard and I get low end rumble at higher volume . The Allnic does have variable gain boost ..I’ve tried them all and same result . 
 

I seriously doubt it’s the position of turntable or the arm because pretty much same arm on same deck with lower gain Hana ML cart works fine . 
 

end result - 

received completely rewired arm back from VPI and it works fine with Lyra now 

2 variables : 

1. Changed out to HW-40 feet 

2. Moved TT to middle of cabinet away from speakers

@tablejockey @mulveling @larryi @atmasphere 

so frustrating....thanks for the help ..I wanted to add that the low end rumble is basically like the bottom end is not tight & consistently ringing...even tested with acoustic guitars (no drums) still get the low end rumble..

So the latest is the arm was sent back to VPI for repair of the white lead...when it returns I'm going to try some better isolation ...incidentally my room is heavily treated with sound panels ,bass traps, sound absorbing curtains....

I might try the HW40 feet I have , they seem way shorter than the Prime Sig feet so not sure all will line up with motor? 

@mulveling

Great advice , you hit on 2 things that are my life ...Hockey/Drums 😃

Pucks  .....is there some better isolation thing I can stack under? Pucks seem super stiff and could transfer? But definitely HW40’s under table 👍🏻 Also the checking feedback with LP stopped is on the agenda when I get the tonearm back. I have 2 arms . The metal JMW-10 (no feedback) and the 3D printed JMW-10 that came w my Prime Sig (feedback galore)

I was thinking about trading in arm for the Fatboy Gimbal , but if it’s this same plastic resonant material I’m nervous..🤔

My hifi desk/shelf isn’t anything special, just a long cabinet that holds/displays the amps and TT.

Thanks!

@mulveling 

man you are REALLY making an argument for just remove the Lyra Delos from the 3D arm & put it on my 10.5 JMW-10 metal arm (I was mistaken not a 10, it's a 10.5")

Also , my floor is all wood where table (also wood) is on , so Im sure that's not helping matters...

I listen very loud at times...

@bpoletti

Thanks for the info ....again strange because not only does VPI use the Lyra mention in their manual for the Prime Signature model, I hear consistently it’s a go to for VPI tables...

Might be the 3D printed arms don’t do as well with Lyra on wood floors etc... ..🤷🏻‍♂️

@atmasphere 

thanks , going to be testing that when I get my arm back from VPI.

@willy-t 

thanks man , my current philosophy isn't condemning my phonostage. I think it's positioning / tonearm related... 

@mijostyn @atmasphere @mulveling @lewm @tablejockey 

So I just bought a 2" butcher block that's (solid AF) & 4 IsoAcoustics pucks, mounted turntable , put stylus down on non spinning record at loud volume tapped around & a/b'd against no butcher block...don't really hear much difference 🤷🏻

@mulveling 

I think Im chasing ghosts here...rabbit hole of trying to isolate came up with Hana ML & metal tonearm (which does not feedback) just looking for best possible isolation. When I get the Lyra back I'm going to switch it from the 3D printed arm to the metal arm to test...but I think I already know the answer 😃 plastic vs metal. 

@tablejockey 

possibly ? Not really sure , thanks !