[78-L] One or three holes?

[Martin Fisher]

Three holed urban legend.  These are erroneously referred to as "punch
marks" by misinformed Elvis devotees who believe the pressing machine made
them while extracting the finished 45 rpm records!

Tee hee

MF

-----Original Message-----
From: 78-l-bounces at klickitat.78online.com
[mailto:78-l-bounces at klickitat.78online.com] On Behalf Of Milan P
Milovanovic
Sent: Thursday, June 30, 2011 2:08 PM
To: 78-L Mail List
Subject: Re: [78-L] One or three holes?

Thank you so much for explanation!

Best wishes,

Milan


----- Original Message ----- 
From: "Graham Newton" <gn at audio-restoration.com>
To: "78-L Mail List" <78-l at klickitat.78online.com>
Sent: Thursday, June 30, 2011 1:51 AM
Subject: Re: [78-L] One or three holes?


> Milan P Milovanovic wrote:
>
>> not so while ago, the discussion about details of lathes raised. I came
>> across this record sample
>
>> http://youtu.be/tc2FrjRa9Os
>>
>> It is clearly visible only one hole mark besides spindle. I always
>> thought that one additional hole on lacquer was reserved for amateurish
>> type media and three additional holes for professional blank samples.
>>
>> Someone knows what's in case here? Why is there only one? Could it be
>> possible that recording engineers used semi pro or amateur recording
>> blanks?
>
> It depends on the type and design of the recording lathe.  The extra hole 
> or
> three holes are drive holes to engage with a single (usually spring 
> loaded) pin
> to prevent the lacquer disc from slipping as it is being cut for the 
> master.
> Why some lacquers were supplied with three holes is a mystery, since I 
> never
> encountered anything where more than one hole was needed.
>
> All home use disc cutting machines used discs with at least one drive 
> hole.
>
> Many professional mastering lathes like Scully and Neumann used lacquers 
> with
> no drive holes, only the center pin, and it was hollow to allow vacuum to 
> be
> conducted under the turntable platter to hold the lacquer flat while it 
> was
> being cut.
>
> Lathes like Presto, RCA Victor and others found in broadcast studios 
> mostly
> used lacquers with the drive hole since it was much cheaper to make a
> non-suction-hold-down turntable.
>
>
>
>
> ... Graham Newton (RCA Victor disc mastering engineer in a former life!)
>
> -- 
> Audio Restoration by Graham Newton, http://www.audio-restoration.com
> World class professional services applied to tape or phonograph records 
> for
> consumers and re-releases, featuring CEDAR's CAMBRIDGE processes.
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