N Cook wrote in message
...
I decided to take a skew view before wiring in
http://home.graffiti.net/diverse:gra...et/ful-fi4.jpg
2 rings of green silicone rubber sleeving to take silvered wires before
dabs
of gummy glue.
One black rubber pad chamfered to rest in the top cover, yellow-white
rubber
pad cut down , orginal brown rubbery moulding that enclosed both original
rochelle crystals and extensions to both stylii saddles.
The saphire of the original remounted ( coded yellow and green) stylus is
just visible to the top and right of the brown section, through a gap in
the
white plastic casing.
The original small plastic stylus saddle went quite neatly through the
hole
for the original rochelle.
The now unused second brass screw mount for the other stylus and its
corresponding saddle rest flat, on the brown section, is visible on the
lower edge.
Decided to wire in only one active element of the Sonotone and also to
have
more space to play with ditch the 78 option and just use 2 of the original
3
pins and plates to the outside. It is very critical on signal generation
on
how much the rubber supports are compressed, I may cut the thickness down
a
bit if the sound is ropey.
It would probably be possible, in space terms, to separate the 2 sonotone
and mount one either side and retain double stylus, rotating function.
--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
Got back to this back-burner job today.
I had to abandon putting piezo element in the original cartridge housing,
not enough output.
Sliding a cable tie lightly over the stylus gave about 100mV , wheras doing
the same over a complete piezo, ie vibration not having to go through a load
of brownish rubber gave about 2V pk-pk output with the cable tie.
Adabted the yoke to be able to slide in piezo pick-up ,retains the little
78/LP flag , and can rotate but no second stylus, and is shrouded in the arm
so nothing shows in normal use.
--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/