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page updated 10/08/2020
This is a further re-think of the R7.1.
Above: update 10/08/2020 On the rack and Sitting on the shelf the R7.1a
project awaits another tonearm, armboard and motor controller.
The detail changes:
- As before the core machine is from a donor Thorens TD150. Mk1 or
- Spring suspension is retained but with fittings for adding weights next to
each spring mount. This allows ballast loading adjustments until each
spring carries the same load as the other.
- Plinth: a composite of (1-1/2 inch thick) Cherry hardwood and Baltic Birch
ply with mitered corners. Finish to compliment the Cherry.
- Motors and motor controllers. There are options to explore.
- Tonearm choices. Think about what cartridges we want to use on this
project. The tonearm must be mass-matched to the compliance of
- Will it be an Lp12 competitor? .... Money will be the limiter -- not
potential, because down in its core essence, the Lp12 is a copy of the
TD150. If we follow the Linn pattern of over their -almost- 50 year history
of upgrades, and then pursue those as did Linn, will our results be worth
the bother?....Let's find out.
hint: click on thumbnail to view image full size
Signal and Power Port brackets in place. (unfinished) Never mind the R7
armboard in place. New arm board blanks are on the way.
A variety of different arm board materials will be in trial use. But I
think Cherry hardwood is a good starting point. Less dense than mdf.
I have used it in past versions of the R7 and results were not disagreeable in
any audible way I could detect. Aesthetics are a consideration.
The R7.1A plinth; We have the first build in-house! Here are
some receiving photos.
This plinth build is composed of two different wood types. Primary:
solid Cherry hardwood 1-1/2 inch thick all around. Secondary: Baltic Birch
12mm thick for the inside liner and the bottom plate.
As it turns out it may be some time before I can get another plinth like this
one produced. My brother just moved out of his workshop. In the mean time
I can build this turntable into something very special.