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Tonearm Measurements

Hello everyone,
I am in process of buying a tonearm for my Oracle AC turntable (the same as MK1 or MK2 except it doesn't have electic 33 to 45 RPM switch).
I am little confused. I emailed Oracle. And they said that I should get a tonearm that "...that does not exceed 9" (armtube)..."
At the same time I use now 12" inches long Denon-401 tonearm with my turntable. And it appears if fits the turntable just fine.
I've read several tonearms manuals. And I notices there are two kind of lenght measurements taken. One lenght is being called as "Overall Lenght". And another is "Effective Lenght". "Effective Lenght" has always smaller number than "Overall Lenght". In case of my Denon-401 tonearm...
its Overall Lenght is 12.6 inches and
its Effective Lenght is 9.6 inches.
Would someone please explain what the difference between "Overall Lenght" and "Effective Lenght". And how to measure them.
And if you happen to know what lenght tonearm should have to fit to Oracle AC, MK1, MK2 turntables please let me know.
Thanks in advance!
sputniks

Showing 1 response by sputniks

sputniks OP
30 posts
 
I've just measured the distance between central spindle to tonearm's pivot point (the point the tonearm spins around) and it appears to be 9" inches (just 2-3 mm less to be exact).
I've heard that this distance is considered to be the most important measurement than needs to be taken into account while choosing proper tonearm. But I still don't know what tonearm's length corresponds to this distance....I was able to pull following info from Internet... if the distance between the central spindle to the rotation point of the tonearm is around 8.5" inches then 10" inches tonearm should be used.
If that distance is around 9.5" inches then 12" inches tonearm should be used... Please confirm if that sounds right to you.
Thanks in advance!
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