Straight Arm Mod
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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]
