Difference between revisions of "Straight Arm Mod"
From skratchtek
(Created page with "Focus invented the first Technics straight arm mod : File:Index.jpg The formula for calculating the ideal length of an underhung straight tonearm is as follows : Fi...") |
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Where : | Where : | ||
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L = The length the tonearm needs to be, from the pivot point to the needle | L = The length the tonearm needs to be, from the pivot point to the needle | ||
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D = The distance from the tonearm pivot to the spindle | D = The distance from the tonearm pivot to the spindle | ||
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C = The record radius constant, (3.04 for 10 inch records, 3.18 for 12 inch records, see the Radiotron handbook) | C = The record radius constant, (3.04 for 10 inch records, 3.18 for 12 inch records, see the Radiotron handbook) | ||
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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 can be found by measuring the outside and inside radius of a typical record's grooves and plugging the values into this formula : | ||
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C = (R12 * R22) / (R12 + R22) | C = (R12 * R22) / (R12 + R22) | ||
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Where : | Where : | ||
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R1 = Outside radius of record groove | R1 = Outside radius of record groove | ||
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R2 = Inside radius of record groove | R2 = Inside radius of record groove | ||
More information can be found in the Radiotron Designers Handbook, page 765 : [http://www.tubebooks.org/Books/RDH4.pdf] | More information can be found in the Radiotron Designers Handbook, page 765 : [http://www.tubebooks.org/Books/RDH4.pdf] | ||
Revision as of 11:23, 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]
