richard_crl032
I've installed two Micro Seiki 505s, 1 technics b-500 base/arm, and 1 Acos Lustre GST-801. All have easy VTA adjustment, but I would not adjust them while playing.
These JVC arms have ON THE FLY VTA, a big draw for perfectionists.
Maintain matching vintage appearance (they are cool looking), and use an existing tonearm hole after fix.
The composition difference between original rubber and replacement rubber is nearly irrelevant, it is the concept of isolation that was important, and simply get's restored.
OEM description in 1981:
"UA series universal tone arm with new gimbal support system.
The total length and effective length are different between UA-7082 and UA-7045.
The UA- 7082 and UA- 7045 are equipped with a helicoid height adjustment mechanism that can be adjusted during performance.
A virtual one point support structure is adopted for the bearing system, and strength and reliability superior to gimbal support are pursued.
In the virtual one point support structure, four precision radial ball bearings are arranged long distance from the virtual center point, so the force applied to each bearing and the rotation angle are equal for any rotation direction, and the same performance as the one point support can be obtained.
In addition, all bearings are fixed to the same part by micron precision machining using camera technology, ensuring high sensitivity and high durability.
A chucking lock type head connector is adopted, and looseness is eliminated by strongly tightening the shell plug part with the same principle as the drill chuck.
Uses a non-resonant head shell in which the shell body and plug part are integrally molded."
btw, the long 7082 is only 11-1/8" effective, one of the shortest long arms ever.
