This replacement rigid tonearm counterweight kit will fit all Yamaha PX-2 and PX-3 turntables utilizing both YA-27 and YA-32 tonearms.
The removal of the original decoupled counterweight and installation of my rigid design takes approximately 40 minutes and comes with clear instructions. This kit comes with 2 different mass counterweights allowing you to use any cartridge/headshell mass combination you like.
I designed these counterweights to accommodate Yamaha's auxiliary sub-weights at the outside ends (see the pictures of the small holes) of the counterweights for maximum tuning flexibility of polar moment of inertia and counterweight positioning. My counterweight design can also be removed and the original counterweight reinstalled if necessary.
The original counterweight design (like the majority of tonearm designs), uses an elastically decoupled counterweight for what is known as "dynamic damping". The purpose of dynamic damping is to theoretically increase the amount of damping control at the tonearm's fundamental resonance frequency. This is the infrasonic frequency that is hopefully higher than the majority of warps, but lower than the lowest desired audible frequency.
The problem with the real-world implementation of dynamic damping is that it rarely works as well as intended for damping the fundamental resonance, and it totally destroys any chance of the tonearm pipe enjoying the important benefits of a rigid coupling to a high polar moment of inertia mass at all frequencies higher than the fundamental resonance (the audible band).
So the purpose of this is to add a very significant amount of rigidly coupled mass into the roll and yaw plane of the tonearm pipe. The addition of this rigidly coupled mass has a significant effect on the control, stability, and silent operating qualities of the tonearm pipe. The differences you wind up hearing closely parallels these changes. This design also allows the counterweight to be positioned as close to the pivot as possible and therefore reduces vibrational energy ingress into the tonearm pipe from the environment as well as reducing vibrational energy ingress into the bearings coming from the cartridge.
The net result is a significant improvement in sound quality due to addressing a very important area of the turntable right at the source of the problem. Other tonearm alterations done further downstream from the pivot bearings will have much lower effectiveness. Other than having your turntable properly cleaned, calibrated, and operating properly; this is, without a doubt, the best alteration to start with.
Currently these kits are made to order. Payment is required before your kit is constructed. Shipping is $12.00 via USPS priority mail within the US. Overseas customers will have to check with me first for shipping costs.
Thank you, Professor Bizzt

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