my DIY Turntables and DIY tonearm

[Roger Waters]

you need a disc with a smoothe face (certain discs for DJ have a smooth face, you find that not expensive occasion, or a disc of adjustment)
You start the turntable with the smooth disc, you places the arm on the medium:
A) the arm goes towards outside, you must reduce the force
B) the arm goes towards the interior, you must increase the force C) the arm remains motionless, it is ok, the adjustment is perfect

(before making this adjustment you must regulate your cell and the force of support)

;o)

[jokerweb]

Mmmm, is it a LP with face without recording?
Do you know the exact name of that LP type or where can I buy it?

Thanks again!

[pete.a]

A good friend of mine made a clone of an LP 12 many years ago..and it's still going strong today. Funny how the clock makers can help with such a project..he knew of a local dentist that repaired repaired clocks in his spare time. He made him a few parts..sorry to go on .. Fine engineering work by the way.

[Roger Waters]

Mmmm, is it a LP with face without recording?

Yessss !

Do you know the exact name of that LP type or where can I buy it?

used in the record dealers or the Depot Sale for few euros !

[Miniwatt]

Congrats! Great work! I also like your arm, it seems to me that your choice of materials is errr... well, unconventional and down-to-earth non-exotic. But that doesn't matter of course, as long as the sound is good.
I'm planning to build a turntable myself, right now I'm wondering what materials to use for the plinth, acrylic and steel/aluminum are the current ones. Thought of MDF too, but a lot of people think it's too 'dead' for that purpose. Dampens the liveliness of the music. What are your findings? Did you compare to other turntables?
And indeed: how are the cavities and lead arranged???

Enjoy!!

Miniwatt

[sailorman]

Hi Roger,
congratulation for your work!!!
I'm interesting in building my own TT
can you give some more details on the motor unit?
Where is it coming from?
What kind of control did you choose to reach the correct speed?
I don't see any strobo unit, it means you are runnig with a AC motor?
Concerning the bearing, how can you manage to place the ball in the right position in the middle of the "verin"??
I suppose first you put oil, than the ball and at the end the "verin", if so how do you manage to keep the ball into the center during the assembly?
Thanks for your clarification.

regards

Sailorman

[Roger Waters]

Thought of MDF too, but a lot of people think it's too 'dead' for that purpose. Dampens the liveliness of the music. What are your findings? Did you compare to other turntables?

for the moment I made the comparative one with an old dual, I chose the medium for his neutrality, the result is the absence of resonance and rumble, a silence total with a LP in good condition !

Hi Roger,
congratulation for your work!!!

Thanks You !

can you give some more details on the motor unit?
Where is it coming from?

The DC motor comes from an old tape recorder !
adjustment speeds with 2 trimmer resistor connected to a double switch, look an example "chirurgie":
http://www.formgestalter.com/krishu/...turn_motor.htm
I use a strobo (50Hz) to adjust speeds or a disc test (a track with 1000Hz) with a frequency meter (on the computer).

I suppose first you put oil, than the ball and at the end the "verin"

Yes, of course, I "stick" the ball with a thick grease so that it remains in its housing during the assembly

[livemusic]

Thought of MDF too, but a lot of people think it's too 'dead' for that purpose. Dampens the liveliness of the music.

I was quite happy with my constraint layer sandwich platter untill one day, being heavily affected by tweaking virus, I decided to pull the middle sorbothane layer out. Now I know what exactly "sucking the life from the music" means. With the soft layer in place, the color richness of the sound (primarily accoustical instruments and voices) was lost. I was foolished by the fact, that the high and low extremes were affected much less.
But those subtle higher and lower harmonics (overtones), wich give the instrument its characteristic sound signature, were supressed.
Note, that the upper layer was directly coupled to subplatter, so no compliant material was introduced into vibration path (see the sketch below). CLD principle was implemented in purpose to kill "resudal" vibrations, aside of the main vibration path. So, I came to conclusion:
1. The platter material and its damping/vibration proterties are absolutely critical for good sound.
2. No compliant materials ("heavy absorbers") shall be placed invicinity of cartrige.
3. I must give the hardwood platter a try.

[docjoe]

dis donc roger, on est un forum d'adorateurs de LS3/5a, basé en france
on s'interresse au vinyl et ta platine nous intrigue
peux tu venir nous en parler un peu sur www.ls3-5a-forum.com

[Roger Waters]

Hey Joe !

Je connais un peu le Forum LS3/5A, il m'arrive de le parcourir, je l'ai connu car Pascal (PTSOUNDLAB.COM) l'avait mis en liens sur son excellent site !

J'avais posté la même chose qu'ici sur le site de Pascal :
http://www.ptsoundlab.com/forum/viewtopic.php?t=609
et le préamp à tubes fabriqué d'après les conseils de Pascal:
http://www.ptsoundlab.com/forum/view...r=asc&start=45

Depuis la platine a été équipé d'une cellule DECCA Garrott Microscanned acheté une fortune à un anglais sur ebay.uk, la platine a fait un bond en avant mais il faut que j'alourdisse le bras, il est trop léger pour cette cellule...

J'avais aussi une paire de blocs mono à tubes pushpull 845 en construction, mais c'est en standby cause travaux maison, je suis donc inactif au sein des forums par manque de temps (et je n'ose pas trop y mettre le nez car c'est un bouffe temps pas possible)

Il y a qlq temps j'avais essayé de m'inscrire sur le forum LS3/5A, mais ma boîte hotmail n'étant pas acceptée et étant déja inscrit sur pas mal de forum, je n'avais pas insisté...
Va falloir que je trouve une solution pour l'inscription car votre section vinyl est très active !