Many thanks for this info.
I have found, consistently and over many years, that glass-based
lacquers sound "better" that the more common aluminum-based ones.
I've never come across the same program on the two different types
of discs, so a purely objective comparison has not been possible.
But the glass base always seems to impart a noticeable clarity to the
sound, and I'm pleased to learn that it isn't just my imagination!

Doug Pomeroy
Audio Restoration & Mastering Services
Transfers of metal parts, lacquers,
shellac and vinyl discs & tapes.
193 Baltic St
Brooklyn, NY 11201-6173
(718) 855-2650
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> Date:    Tue, 24 Apr 2012 01:45:35 +0200
> From:    George Brock-Nannestad <[log in to unmask]>
> Subject: Re: Determining substrate of laquer discs
> From: Patent Tactics, George Brock-Nannestad
> Hello Mike,
> to your very thorough discussion of glass vs. metal I can add the  
> following
> reference:
> Audio Record Vol. 7, No. 3, pp. 1-2, March 1951
> - this is the magazine of Audio Devices, and they discuss the  
> advantage of
> having the much smoother surface of glass to use as a base, and they  
> sound
> clearer. Surface roughness graphs of iron, aluminum and glass are  
> shown (and
> if they have not cheated), the glass is very much smoother. They  
> claim that
> their process is much improved over the wartime ones.
> Audio Record may be found on the internet archive.
> Best wishes,
> George