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Path: utzoo!watmath!clyde!burl!ulysses!harpo!decvax!cca!ima!inmet!grw
From: grw@inmet.UUCP
Newsgroups: net.audio
Subject: Re: Discwasher Antistatic Mat - (nf)
Message-ID: <1341@inmet.UUCP>
Date: Thu, 26-Apr-84 06:03:27 EST
Article-I.D.: inmet.1341
Posted: Thu Apr 26 06:03:27 1984
Date-Received: Sat, 28-Apr-84 09:25:35 EST
Lines: 40

#R:inmet:2600066:inmet:2600069:000:1616
inmet!grw    Apr 25 11:41:00 1984



	Well, as usual I received several informative responses to my
	inquiry.  The salient points re: Use of Discwasher Mat are:

    -	Use the mat with the original turntable mat because the rubber
	mat damps vibration thus reducing rumble and feedback.

    -	When used in conjunction with a rubber mat the Discwasher mat is
	grounded through the spindle (now why didn't I think of that?!).
	However the suggestion was made that the turntable should be 
	grounded to something other than the amp (assuming the amp is not
	grounded) such as an outlet box to really benefit from the mat.

    -	The vta is affected by use of the mat.  One response put the vta
	change in the order of 8 to 10 minutes (nothing to be concerned
	with) and another response sited the lack of industry compliance
	with a vta standard during cutting of the master (also nothing
	to worry about).

    -	One response indicated that the mat could be cut to support only
	the grooved region of the disk (allowing the lip and label area to
	protrude below the surface of the mat) and that slippage (presumably
	when the mat is used directly on the metal platter) can be reduced
	by gluing the mat to the platter.

	One last question.  Does use of the mat mean I *must* realign my
	cartridge?  I borrowed a Cartalign to do the alignment several months
	ago.  I'm not sure I see why use of the mat should require cartridge
	realignment (I plan to buy a Cartalign or similiar device to check
	alignment periodically anyway).


					-- Gary Wasserman
					...harpo!inmet!grw
					...hplabs!sri-unix!cca!ima!inmet!grw
					...yale-comix!ima!inmet!grw