-edible zone-
-- A few different sketches were shown, and among them the selection was to be R7 - Here are some views of the R7 concept dwg.
--Concept:
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-- Reality:
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(click thumbnail for full size image)
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-- It's a layered build using 1/2 inch baltic birch plywood
-- 10/24/2009
-- Assembly check for fit.
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-- Back view. Noting the location of the KAB PC-1200 connector plate which holds the RCA ou7tput jacks and ground stud. An IEC input socket accepts a PC style power cord.
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close-up of the KAB PC-1200 RCA bracket
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--Fits check good, Next process: multi-coat automotive acrylic lacquer in Black.
-- The Cherry armboard has yet to be cut. For now the stock Thorens
board has been drilled to fit the Jelco SA-370H tonearm. This setup will
be used for initial / preliminary evaluation. Then the Cherry board will
be prepared and fitted as the final bit of construction.
Paints
have been purchased for the wood plinth. A lacquer sanding sealer from
Minwax will be used initially to seal up the porosity within the wood.
Then Ditzler D73Q (Kondar) primer surfacer will be
applied/sanded/applied multiple times as a preparation for the top coats
which will be Ditzler DDL9300Q (lacquer black). The sealer applications
will begin tomorrow.
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-- Black Lacquer.
-- 12/6/09
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-- The plinth is not entirely from a Baltic Birch build-up. There are three motor plate supports from Gabon Ebony. The shims seen in the photos are LE Phenolic and Delrin.
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-- Reassembly
-- 12/13/09
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(click thumbnail for full size image)
-- A close-up detail of the "suspension" unit. This rubber assembly
replaces the original conical coil spring for a much firmer, less bouncy
isolation medium. When the building structures we live in are designed
to be flexible, and with springy floors, this is one practical solution
to the footfall issue. In practice, these spring substitutes make no
sonic sacrifices in comparison to the spring suspension. To my ear, an
improvement is heard in pace, timing and rhythm.
Delrin shims are
used between the armboard and subchassis. The Delrin pad maintains a
rigid mechanical connection while providing a resonant filter to assist
in reducing the amount of resonant transfer between armboard and
subchassis. In this build-up, the Cherry armboard is meant to be the
sole structure that absorbs any resonance traveling off the tonearm.
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Showing the AC hook-up just before mounting the 'iec' socket. To
disassemble the turntable assembly from the plinth, this will be one of
the first items to "un-hook" before being able to lift the top motor
plate up and out of the plinth.
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Adjust motor azimuth for best belt tracking /speed shifting.
-- Next: tonearm alignments, test record, and then early listening.