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Hey Doug,

I always thought it was my imagination as well. But those glass disks to my ears always sounded remarkable compared to the aluminum. The first time I encountered one of these was mind blowing. I heard so much detail. I'll never forget that revelation.

Ciao,
Adrian

http://www.sawneybean.com/AudioTransformations/

On Apr 24, 2012, at 12:42 AM, Doug Pomeroy wrote:

> George,
> 
> 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
> [log in to unmask]
> 
> =========================================================
> 
>> 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