Difference between revisions of "Straight Arm Mod"
From skratchtek
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| − | C = ( | + | C = (R1<sup>2</sup> * R2<sup>2</sup>) / (R1<sup>2</sup> + R2<sup>2</sup>) |
Latest revision as of 13:56, 2 February 2016
Focus invented the first Technics straight arm mod :
The formula for calculating the ideal length of an underhung straight tonearm is as follows :
Where :
L = The length the tonearm needs to be, from the pivot point to the needle
D = The distance from the tonearm pivot to the spindle
C = The record radius constant, (3.04 for 10 inch records, 3.18 for 12 inch records, see the Radiotron handbook)
C can be found by measuring the outside and inside radius of a typical record's grooves and plugging the values into this formula :
C = (R12 * R22) / (R12 + R22)
Where :
R1 = Outside radius of record groove
R2 = Inside radius of record groove
More information can be found in the Radiotron Designers Handbook, page 765 : [1]
