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

Hello all, strange one here...just picked up a VPI Prime Signature Rosewood and a Lyra Delos with about 20-40 hours on it...sounded great at low volume with my sacred Steely Dan - Aja Cisco pressing . Later that night at higher volumes I'm getting a midrange-low feedback . 

Here's my rig : 

VPI Prime Sig with Unipvot / Lyra Delos 0.6m output voltage / 1.75 tracking force

Allnic 1202 Phono Pre (variable DB boost  +22, +24 , +28, +32) 

Manley Snappers / Jumbo Shrimp Pre 

Harbeth 40.3XD 

So I A/B'd w the old turntable VPI Prime Scout / Unipivot / Hana ML 0.4 Output and all was fine 🤔 I then swapped arms moving the Hana to the Prime Sig , no feedback ....🤔

I've tried adjusting the Allnic (all 4 levels mentioned above) and get feedback with the Lyra on every setting...

The hifi business I purchased from said they had tested thoroughly and had 0 problem with it ...so I'm perplexed , this doesn't seem to be any vibration feedback , is the Lyra just not jiving with my Phonostage for some reason? 

Any help appreciated ...

 

128x128tommypenngotti
mijostyn's avatar
mijostyn
8,223 posts
 

Tommy, you have several problems that lead to issues like this. Your turntable is not adequately isolated and Lyra cartridges do not like unipivot arms. You need an isolation platform tuned to 3 Hz or below and a gimbal pivoted arm, then the Delos will work fine. Lyra cartridges are relatively compliant and that arm is also too heavy for it. 

tommypenngotti's avatar
tommypenngotti OP
217 posts
 

@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
3,742 posts
 

Mijostin's comments make sense.  If the arm is already too heavy (meant for a low compliance cartridge) there is nothing much that can help.  You have a basic incompatibility, and perhaps a beef with the dealer who sold you the cartridge.  It is not the fault of the cartridge--it is like putting the wrong kind of tires on a car and blaming either the car maker or the tire maker for the poor performance.

While you might not be able to cure the problems that result from this incompatibility, you might be able to reduce the feedback by changing the isolation and tuning of the table's suspension (try different platforms, different feet, try making the platform the table is sitting on more rigid, etc. If your unipivot has provisions for damping its motion you can change the amount of damping.  

tommypenngotti's avatar
tommypenngotti OP
217 posts
 

@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 🤔

 

 

tablejockey
3,793 posts
 

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

File this under "on paper it's  not supposed to work, but it might" category.

I've heard more than a few Lyra on VPI's, and they all seemed to sound good.

Tried  a Delos on my Classic and it was great. Sits on cheap stand supported by 100 year old wood floor.

The ol' YMMV strikes again.

 

 

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