Is my cantilever broken?


I may be revealing my ignorance in spades here, but here goes... Just received a Dynavectpr 10x5 .

When I placed it on my GeoDisc for alignment, I noticed that the cantilever gave under the weight of the cartridge, somewhat like the suspension system in a car.

In other words, the cartridge continued to move downwards into the cantilever, causing the angle of the cantilever to increase.

I have never noticed this before, but perhaps because I have never owned a cart with an entirely exposed needle.
zeluiz22
Suspensions (rubber damper) tend to get brittle (stiff) with time and exposure to air pollution - specifically ozone. Cartridges from Benz, Koetsu and Allaerts tend to be very stable over time. I'm sure that there are other brands that are also fairly stable, but I know of these three brands for certain.

It's difficult to predict how any retip will behave. Most retippers can give you an idea of the condition of the cantilever and suspension, but know that there's at least some aging effect that's not predictable.

This will have the effect of shifting the compliance a bit (lower) and can therefore have different effects depending on the mass of your tonearm. IOW, you stand as much of a chance as effecting a minor improvement as a degradation - depending on how perfectly your arm was matched to the cartridge in the first place.

The good news is that you can compensate for a slight decrease in cartridge compliance by adding a bit of weight (a gram or two) to the headshell. It's difficult to reduce a tonearm's effective mass unless you have a set of counterweights to play with (e.g. Moerch, Triplanar) or a tonearm like a Moerch with different arm wand options.

I've not heard of bad results from Koetsu and Benz (retip only) but I treat this information as anecdotal at best. Allaerts are by comparison quite rare and I have not heard reports of any retips on these.

In short, I'd take a shot at sending it to Soundsmith. Peter will give you the scoop to the best of his ability which is quite high.

Cheers,
Thom @ Galibier
Thanks, all.

So, Thom - does a decrease in compliance cause more or less movement of the cantilever? It seems to me that "stiffness" would create less shock resistance, more rigidity and therefore less movement.

So, what appears to be a soft suspension with alot of give would maybe indicate a newer cartrige?
I wouldn't look at this in terms of cantilever movement, but perhaps Jonathan or Peter are lurking and can comment further.

A good way to think of compliance is in terms of mass compatibility with a tonearm.

In short, decreased compliance means the suspension is stiffer and tends to transmit more energy into the tonearm.

This in turn requires a more massive tonearm to bring the resonant frequency into range. Dealing with the extra energy encompasses the entire tonearm and turntable design although increased arm mass can help in this area too.

Think of a compliance mismatch from an automobile analogy. Picture the springs from a 3/4 ton pickup truck installed on a Porshce. This would be an extreme example comparable to too stiff of a cartridge on too light of a tonearm.

Cheeers,
Thom @ Galibier