This thread continues to pique my interest for some reason. Maybe it's because it's so hard to find information on the different well-tempered arms between their messy website, a blog, and the whole of internet forums. I still can't figure out which versions have the headshell with a single-point mounting slot that allows for user-adjustable alignment. At any rate, I am pretty sure that a 10.5" effective length, 19-degree offset angle, and 1/2" overhang are correct for the Amadeus. Here's the plot for that, which I will call "bad Stevenson" :thmbsp::
Well Tempered Classic - Alignment Protractor
- Thread starter glangley
- Start date
Brett a
~◦●○o0o○●◦~
I know at this point, it's a digression from the OPs question. But here goes anyway....
FWIW, the arm on my WTRP has a slot in the head shell mount. You can see in the attached picture, it's the center screw, not the two cartridge mounting screws. But it does offer the some adjust ability as any slotted head shell. But the slot may not be needed for overhang adjustment....
Another unique thing about this design is that the tonearm post can pivot in the plinth. So you can set overhand by simply rotating the main mast one way or t'other. If their other arms can rotate in the plinth like this, that would explain why they did away with the cartridge mounting slot; it's really not needed.
Now, if we want to get a little further into this (for my arm at least) I'll tell you that that slot is actually for adjusting anti-skate. You guys may or may not know that the anti-skate on a WT arm is produced by simply having the fishing line pass through the arm beam through two separate holes (see attached pic). The further apart the holes are, the more the lines resist twisting as the arm tracks toward the label. The distance between these two holes is adjustable on other WT arms, but not on mine. So rotating the whole arm causes more or less pre-loading of this twisting of the lines. Therefore the slot on the headshell is actually better used to adjust the anti-skate. Follow me?
FWIW, the arm on my WTRP has a slot in the head shell mount. You can see in the attached picture, it's the center screw, not the two cartridge mounting screws. But it does offer the some adjust ability as any slotted head shell. But the slot may not be needed for overhang adjustment....
Another unique thing about this design is that the tonearm post can pivot in the plinth. So you can set overhand by simply rotating the main mast one way or t'other. If their other arms can rotate in the plinth like this, that would explain why they did away with the cartridge mounting slot; it's really not needed.
Now, if we want to get a little further into this (for my arm at least) I'll tell you that that slot is actually for adjusting anti-skate. You guys may or may not know that the anti-skate on a WT arm is produced by simply having the fishing line pass through the arm beam through two separate holes (see attached pic). The further apart the holes are, the more the lines resist twisting as the arm tracks toward the label. The distance between these two holes is adjustable on other WT arms, but not on mine. So rotating the whole arm causes more or less pre-loading of this twisting of the lines. Therefore the slot on the headshell is actually better used to adjust the anti-skate. Follow me?
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From what I recall, the Well Tempered protractor is unique to proper set up of a WT arm and table. It doesn't conform to the results from other protractors. Also, when you place the protractor on the spindle, you line up the end of the arm with the outer edge of the circle = it passes past the spindle to the far side of the circle. This aligns the arm and base. Mount the cartridge to the finger lift and connect it with the smaller center screw thru the arm slot. Then adjust the cartridge's position and angle to align the 2 null points on the protractor.
I've seen WT arms mounted to the slot with one of the cartridge screws... most likely due to the little center screw being lost or stripped.
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