Phono tease

Kuoppis

Kuoppis

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Jan 19, 2015
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Just came across this Feikert Firebird, very interesting concept with the Kuzma tonearm.

cc94537b595f4c001918b4f555a0a9c6.jpg


Point being, even if it is the 50K Kronos, a tonearm is never exactly aligned, unless it is tangential. Thales attempts to achieve better alignment with the double wand, but it still is not tangential.

I wanna.


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Kuoppis said:
Just came across this Feikert Firebird, very interesting concept with the Kuzma tonearm.

cc94537b595f4c001918b4f555a0a9c6.jpg


Point being, even if it is the 50K Kronos, a tonearm is never exactly aligned, unless it is tangential. Thales attempts to achieve better alignment with the double wand, but it still is not tangential.

I wanna.


Sent from my iPad using Tapatalk
Click to expand...

Just remember, there is no free lunch in this hobby and everything comes with a tradeoff of some sort. I owned the ET-2 arm for years and I loved the purity of the arm. However, it doesn't have a true ground and trying to eliminate hum was interesting to say the least. It wasn't until I purchased the SME 312S arm that I heard the same level of purity from a pivoted arm which I chalked up to the SME 312S being a 12" arm. The longer the arm, the less tracing error. But then comes the "no free lunch" part and proponents of short tonearms will tell you that you lose some of the magic of the short tonearm and introduce new issues when you go to a longer arm. I would love to hear the Kuzma arm in my system and I wonder how it is grounded.
 
Where do the resonances traveling down the arm tube go if there is no massive arm base? Kuzma makes a 14" 4-Point. I wonder which sounds better, or are they just different?
 
puroagave said:
what makes you believe resonances are not nulled at the armtube or are we just guessing...
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I don't know who "we" are, but I am guessing. Perhaps the resonances are 100% nulled somewhere along the length of the armtube and that the armtube acts as a sink for all vibrations. I don't know. It seems this would be very difficult to confirm. Are you saying that they are completely nulled, or are you also not sure? If you are sure, could you explain how you know this?

I am presuming that they are not completely nulled and have no place to travel because of the decoupling at the air bearing tube. Once trapped in the arm tube, they remain to interact with newly generated vibrations. If this is not the case, could you explain what happens to the vibrations? I am under the impression, perhaps false, that the four point bearing in the other Kuzma arm is in part designed to allow vibrations to exit and travel away from the cartridge and armtube.
 
PeterA said:
I don't know who "we" are, but I am guessing. Perhaps the resonances are 100% nulled somewhere along the length of the armtube and that the armtube acts as a sink for all vibrations. I don't know. It seems this would be very difficult to confirm. Are you saying that they are completely nulled, or are you also not sure? If you are sure, could you explain how you know this?

I am presuming that they are not completely nulled and have no place to travel because of the decoupling at the air bearing tube. Once trapped in the arm tube, they remain to interact with newly generated vibrations. If this is not the case, could you explain what happens to the vibrations? I am under the impression, perhaps false, that the four point bearing in the other Kuzma arm is in part designed to allow vibrations to exit and travel away from the cartridge and armtube.
Click to expand...

I've posed this question a number of times to designers like AJ Conti (may he RIP) Bob Graham, Allen Perkins, et al. Not one of them differed in their response, a properly damped arm tube dissipates residual energy as heat and doesn't (shouldn't) rely on the arm base as a 'sink' because it doesn't get that far.
AJ measured everything and had a suite of SOTA measuring equipment, it was his passion.

if you're referring to Fremer's review of the Kuzma Airline he mentions the lack of a damping trough as a shortcoming but doesnt make his case, imo. He compares it to the Rockport 6000 that does have a damping trough (as does the Eminent Technology ET-2, optional on both). As I own both, I can tell you the Rockport and ET-2 sound best without any external damping.
 
puroagave said:
I've posed this question a number of times to designers like AJ Conti (may he RIP) Bob Graham, Allen Perkins, et al. Not one of them differed in their response, a properly damped arm tube dissipates residual energy as heat and doesn't (shouldn't) rely on the arm base as a 'sink' because it doesn't get that far.
AJ measured everything and had a suite of SOTA measuring equipment, it was his passion.

if you're referring to Fremer's review of the Kuzma Airline he mentions the lack of a damping trough as a shortcoming but doesnt make his case, imo. He compares it to the Rockport 6000 that does have a damping trough (as does the Eminent Technology ET-2, optional on both). As I own both, I can tell you the Rockport and ET-2 sound best without any external damping.
Click to expand...

Hi Rob, ever considered the Kuzma Airline? Or why did you not consider it? I would say Kuzma is a quite respected tonearm maker.


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Kuoppis said:
Hi Rob, ever considered the Kuzma Airline? Or why did you not consider it? I would say Kuzma is a quite respected tonearm maker.


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Click to expand...

The Rockport eclipses the Kuzma, you cant buy a Rockport for love or money. I had to wait for an owner to die for one to come to market. my versa dynamics was acquired the same way, scarce as hens teeth.
 
puroagave said:
I've posed this question a number of times to designers like AJ Conti (may he RIP) Bob Graham, Allen Perkins, et al. Not one of them differed in their response, a properly damped arm tube dissipates residual energy as heat and doesn't (shouldn't) rely on the arm base as a 'sink' because it doesn't get that far.
AJ measured everything and had a suite of SOTA measuring equipment, it was his passion.

if you're referring to Fremer's review of the Kuzma Airline he mentions the lack of a damping trough as a shortcoming but doesnt make his case, imo. He compares it to the Rockport 6000 that does have a damping trough (as does the Eminent Technology ET-2, optional on both). As I own both, I can tell you the Rockport and ET-2 sound best without any external damping.
Click to expand...

My questions were inelegantly asked, but you managed to answer them anyway. Thank you. What I thought might be a potential concern turns out not to be.
 
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