Best type of metal for turntable platform?


I have someone that owns a CNC machine. And machine for me a metal platform to the dimensions of 16 x 13 x 3. Ive heard aluminum is a good metal vs price for vibration reduction. Does anyone have any recommendations? Any input would help. Thanks. 
deanshias

Showing 1 response by antaresbluespirit

Hello,

I remember audiophile discuss we had during  the vinyl  " golden age" from middle of seventies to eighties"
We had discovered the " sound" of the turntable highlighted by the audio litterature ( Ivor tieffenbrun Linn sondek)

In general two approach have been acknoledged for the structure design

The ratio of mass
- plinth -platters-tonearm-cartrige tracktability( high or low)
A)
High mass plinth 
High mass platter
High mass tonearm
Low cartridge tracktability

In this configuration the transmission of the energy of vibration is balanced
B)

Low mass plinth
Low mass suspended (or not) platters
Low mass tonearm
Low tracktability cartrige

In that case, the ratio of mass structure between  the elements is also balanced

So, what ever the platter structure is the " bell"  effect must be be reduced keeping in mind that each component have specific " sound" never neutral..

I own two vintage turntables  whitch are complying  perfectly  these rules as example
- Thorens TD 124 II 
( injected aluminium & cast iron)
- sme 3012/2 & DL103)

-Walker Cj 55
Wood and suspended platter in tufnol ( the most neutral backelit phenolic component to be used in aircraft for years)
Colin walker was engineer who used to work for castle engineering in the seventies and launched the linn sondek and Ariston RD11s in uk, Usa and australia inthe seventies...

Sorry fpr this backward looking story !
It is just my experience to be shared...

Raymond