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Why Use Aluminum for a TT Platter?

Mass I am told is a good thing when it comes to TT platters. Lloyd Walker for one extolls it's virtues and as a rule some of the better turntables like to brag about their big ..Platters. Why then would aluminum, known for it's light weight (low density) turn up as frequently as it does as a platter material. I know it is easily machined but isn't there anything better and much denser. Mechans  (Threads | Answers | This Thread) 02-08-11

Responses (1-43 of 43)

Click title to read one, or click date to read all below it. 02-08-11   It is relatively easy to machine and is inexpensive. however ...   Schipo 02-08-11   Maybe because it's non-magnetic and so won't suck the magnet ...   Viridian 02-08-11   I would think copper would be good. especially an alloy tha ...   Elizabeth 02-08-11   I was under the impression the weight of the platter was mor ...   Has2be 02-08-11   The name of the plastic is delrin, a dupont trade name for p ...   Viridian 02-09-11   The idea of "big" or extremely heavy platters is m ...   Jtinn 02-09-11   Just look at the platter of the relatively inexpensive ($2k) ...   Inna 02-09-11   Viridian thanks for the trademark education but michell p ...   Has2be 02-09-11   "belt drives...in terms of speed accuracy, are clearly ...   Wntrmute2 02-09-11   Nothing cogs like a dd. the mass of the platter has nothing ...   Dan_ed 02-09-11   I just know in direct comparisons in the same system between ...   Philb7777 02-09-11   Let me restate that. ;-) the mass is not there for inertia. ...   Dan_ed 02-09-11   02-09-11: wntrmute2 wrote: "belt drives...in terms of s ...   Chayro 02-09-11   Has2be, i wasn't speaking about michell at all, simply about ...   Viridian 02-09-11   I think the key to an aluminum tt platter is to properly dam ...   Peterayer 02-09-11   Aluminum is used for several reasons. the first is that it i ...   Atmasphere 02-09-11   And this is why you as a consumer payed so much for the gold ...   Schipo 02-09-11   i think the reason why direct drive tables tend to have ligh ...   Paperw8 02-09-11   I am in the process of building a turntable made entirely of ...   Manitunc 02-09-11   you're talking about half hertz at 33rpm. that frequency e ...   Hiho 02-09-11: Buconero117 When VPI's Harry was asked that question he said it was all about cost related to the platter and less torque on the motor. Remember Harry went from lead/rubber, to acrylic to aluminum. If one is not very cynical, profit would be the answer. I've heard them all and still think the original TNT platter is best. Buconero117  (Threads | Answers | This Thread) 02-09-11   you can't hear 2hz so obviously i was not referring to any 2 ...   Paperw8 02-09-11   the rotor is part of the motor, propelled by the stator coi ...   Hiho 02-09-11   No viridian it was not missed at all. as usual your need to ...   Has2be 02-09-11   Aluminum (or aluminum alloy) were chosen many decades ago fo ...   Johnnyb53 02-09-11   As a former club dj and as current employee for one of the w ...   Nick_sr 02-09-11   things have probably changed quite a bit since the days when ...   Paperw8 02-09-11   "in the '70s, a 4-to-5 lb. platter was considered a hea ...   Robob 02-09-11   In my experience aluminum is not the best platter material. ...   Teres 02-09-11   i used to have a dual turntable, which was a fairly popular, ...   Paperw8 02-10-11   i was a dealer at an audiophile store in 1975 when the sl120 ...   Johnnyb53 02-10-11   "i find that paper based phenolic, like garolite xx, ma ...   Livemusic 02-10-11   If you use enough aluminum, it can get pretty heavy. it is a ...   T_bone 02-10-11   T_bone, very good post. this dd sub-topic came about after s ...   Dan_ed 02-10-11   Livemusic, yes cocobolo is still the best platter material i ...   Teres 02-10-11   I had a technics sl-1100. i think it had the distinction of ...   Atmasphere 02-10-11   "but compared to other 200-300 turntables of 1975, the ...   Robob 02-10-11   Chris/teres, my understanding of the technical term for cogg ...   T_bone 02-10-11   Copper is the best for platter top!   Ebm 02-10-11   Cogging is measured as torque ripple. it is the amount of va ...   Teres 02-10-11   Chris, i was wondering what physical phenomenon generates th ...   T_bone 02-11-11   there are problems with any metal for being the top of a pl ...   Atmasphere 02-11-11   I wonder if cocobolo is such a good sounding wood if one can ...   Mechans

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