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Re: with reservations

I guess the way to proceed would be to arrange a test to measure resonance flow into various armboard schemes, eliminating all the intuitive/instinctive/subjective takes.

In the Auditorium plinth pictured I don't think that I see any lack of structural integrity in that particular overhanging armboard. It will be rigid providing the armboard material is of adequate tensile strength. Resonant flow from motor, into plinth, into armboard? Just how much vibration does that Garrard motor emit?

My TD124 motor seems well mannered and quiet, emitting only a soft whir that can just be heard when you put your ear next to it. If I place the probe end of a mechanics stethoscope against the cast chassis in the vicinity of the running motor, I can faintly hear the whir of the motor, just barely. Place the stethoscope onto the plinth next to the cast chassis and nothing is heard.

Another stethoscope anecdote, Teres style.
When I had just mounted the Shelter 501 type 2* cartridge to the 'Expressimo RB250' I noticed some very distinct "needle talk" while playing a record with the amplifier muted. I found this to be interesting so I used a Stethoscope to trace the path of these resonances. With the probe placed to the side of the all acrylic Teres armboard I could distinctly hear the music being tracked through the earpieces. I then followed the resonant path of this "needle talk" with the stethoscope. It traveled out of the RB tonearm into the armboard and down into the acrylic base of the Teres. The further away from the tonearm, the fainter the "music" heard through the ear-piece. This confirmed to me, and other Teres owners, that the cantilever armboard of the Teres was indeed transferring resonances away from the tonearm and into the massive base where it would likely dissipate and die. Possibly the resonance would also flow through the cone footer nearest the armboard mounting joint and into the isolation base. It then struck me as being an efficient armboard in the area of resonance management.

Of course there is no similarity of this type between the armboard on the Garrard plinth shown and that of the Teres, which was indeed carefully considered.

-Steve

* The Shelter has a very -stiff- low compliance cantilever and exhibits obvious needle talk.

user510's system

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