[Phono-L] Diamond disk rebuild

Ron L'Herault lherault at bu.edu
Wed Jul 5 22:11:25 PDT 2006


John, the friction  spring that slides under the motor board should have a
tiny bit of tension on it when the lift lever is up in the playing position,
and more tension when the lever is down.  To get the right playing height,
loosen the two square head screws at the top and move the outer tube up or
down so that the flat feed gear does not touch the feed screw mechanism when
the handle is down.  The feed screw should engage the flat feed "gear" by
the time the handle is at the half way point of travel.  The threaded part
at the bottom is the adjustment for playing height.  If you can't adjust it,
your diaphragm may be warped.  You can give the horn a bit of a downward
bend to bring the reproducer closer to the record or you can put another
layer of felt between record and turntable as a stop gap measure.

Ron L

-----Original Message-----
From: phono-l-bounces at oldcrank.org [mailto:phono-l-bounces at oldcrank.org] On
Behalf Of John Sheets
Sent: Wednesday, July 05, 2006 2:47 PM
To: phono-l at oldcrank.org
Subject: [Phono-L] Diamond disk rebuild

I wonder if list members with lots of DD experience could give me some
information?  I am restoring a Chippendale Console Diamond Disk (case needed
a new base, lots of delaminated veneer, etc.) and am perplexed by the post
that the horn and reproducer turn on.  Specifically, I am not getting the
proper distance between the bracket that holds the horn, the finger that
slides along the bottom of the motorboard (and is adjustable up and down)
and the stud that fits into the bottom socket that the whole thing turns on.
I can adjust all of these, but don't get them to the point where the
reproducer sits appropriately on the record surface. Judging from the
(rather poor quality) photos in the manuals and in the Frow book, there is
maybe 1" between the spring steel finger and the bracket, but I can't set
this and still have the lifting lever work to move the reproducer up and
down. (Is this understandable?) I can also screw the stud at the bottom in
or out, to lengthen the whole po
 st.
I have studied the directions in the DD manual but still can't get the
distances correct I am afraid.  Any thoughts? Thanks in advance--
John Sheets

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