Example 2: Custom turntable mounting board
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You may prefer to have a custom Stealth One mounting board for your turntable.
This example relates how a custom Linn Sondek LP-12/Stealth One mounting board was developed.
Hopefully, this process demonstrates certain techniques you may find useful.
Remove the Linn Sondek LP-12 supplied board.
Create a new mounting board from material of your choice, but make the rectangular dimensions the
Create a new mounting board from material of your choice, but make the rectangular dimensions the
same as the original Linn Sondek mounting board. Except,the plate is 2mm thicker than the original.
Position the custom tone arm mounting board squarely equidistant against the inside of both the right-
hand and left-hand sides of the Linn Sondek’s wooden frame. Several parallel wooden slats of constant
thickness are used to maintain equal distance within the turntable frame’s mounting board void area.
With the wood slats tightly in place: On the custom mounting board’s underside, mark the position of
the three original Linn Sondek mounting board holes (using a sharp metal point, like a compass center).
The three underside holes are drilled on center, and then hand-tapped for 3mm screws.
Fasten the custom mounting board to the Linn Sondek’s plinth mounting board extensions, while the
parallel wood spacers are still in place. Finally, remove the parallel wooden spacers. The mounting
board appears to float with an equal mote on all four sides. This process transfers the square accuracy
of the Linn Sondek’s wooden frame to the custom mounting board’s position.
of the Linn Sondek’s wooden frame to the custom mounting board’s position.
Sometimes, it is just more direct to replace the manufacturer’s tone arm mounting board with a board
that is a perfect interface between the Stealth One and the turntable. See photo on next page.
Notice the four Neodymium magnets embedded in the custom mounting board. These magnets are
aligned with four corresponding magnets on the bottom of the Stealth One base plate. To drop the
Stealth One onto this custom mounting board, simply position the Stealth One base plate approximately
along the base plate scribe lines in the custom mounting board (look hard, some can be seen).
The Stealth One base plate will “snap” into a magnetically “locked” alignment. No need for mounting
screws between the tone arm base plate and the custom turntable mounting board.
The standard Linn mounting board is 10mm thick. The custom replacement is a 12mm thick black
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The standard Linn mounting board is 10mm thick. The custom replacement is a 12mm thick black
Plexiglas sheet, beveled 2mm all around on the top surface. The extra 2mm thickness assures that the
tone arm will not bottom out on the Linn Sondek LP-12 turntable frame, as the tone arm base overhangs
the frame slightly in the front.
This custom Plexiglas mounting board is available from Radial Audio as a special order.
