Analog Classifieds

User Manuals

Thorens Dept.

Garrard Gallery

Thorens Gallery

Systems Gallery

Lenco Gallery


Articles and Reviews

Alignment FAQ

Interesting Vinyl

R2R Tape Gallery

Plinth Builder's Gallery

Idler Drive

Cartridge Gallery


What's Under Your Turntable

DIY Dept

Reading List



Misc. Photo


back to the TD150 Dept. index page

page updated 10/08/2020

R7.1a Project

 This is a further re-think of the R7.1.



Dream time.....

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:

  1. As before the core machine is from a donor Thorens TD150.  Mk1 or mkII.
  2. 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.
  3. Plinth: a composite of (1-1/2 inch thick) Cherry hardwood and Baltic Birch ply with mitered corners.  Finish to compliment the Cherry.
  4. Motors and motor controllers.  There are options to explore.
  5. Tonearm choices.  Think about what cartridges we want to use on this project.  The tonearm must be mass-matched to the  compliance of the cartridge.
  6. 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.

DSC_3876dark.jpg (396936 bytes) hint: click on thumbnail to view image full size

DSC_3873 ruler shot.jpg (332913 bytes) ruler shot.

DSC_3878dark.jpg (457314 bytes)

DSC_3881.jpg (384975 bytes) Signal and Power Port brackets in place. (unfinished) Never mind the R7 armboard in place.  New arm board blanks are on the way.

DSC_3889.jpg (381548 bytes) 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.

DSC_3847.jpg (380216 bytes) DSC_3848.jpg (268894 bytes) DSC_3850.jpg (491215 bytes) DSC_3851.jpg (533548 bytes)

DSC_3852.jpg (504688 bytes) DSC_3853.jpg (287795 bytes) DSC_3854.jpg (342182 bytes) DSC_3854knot_detail.jpg (350436 bytes)

DSC_3855.jpg (400655 bytes) DSC_3856.jpg (409959 bytes) DSC_3857.jpg (548366 bytes) DSC_3858.jpg (405062 bytes)

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.