[78-L] Groove spacing - groove width

Sat Nov 19 13:52:59 PST 2016

The Victor Orthophonic Credenza (model 8-30) is, indeed, phenomenal.  I have enjoyed mine for years. Visitors to my home cannot believe they're hearing a non-electrically amplified machine.
I believe the Orthophonic had nearly a four octave range, compared to about two for its predecessors.

Sent from my iPhone

> On Nov 19, 2016, at 4:35 PM, Ron L'Herault <lherault at verizon.net.invalid> wrote:
> 
> 
> I suspect that since acoustics didn't have much bass, whatever improvement
> that came via Orthophonic playback was considered phenomenal. 
> 
> Ron L
> 
> -----Original Message-----
> From: Ron [mailto:roscoer at verizon.net] 
> Sent: Saturday, November 19, 2016 10:18 AM
> To: '78-L Mail List'
> Cc: MOCAPS-L at yahoogroups.com
> Subject: RE: [78-L] Groove spacing - groove width
> 
> Weren't the first Vitaphone movie discs issued in 1926?  I believe the first
> Vitaphone movies were shorts, but that in 1926 "Don Juan" was a silent film
> issued with a Vitaphone sound track comprised only of music and sound
> effects, no dialogue.
> 
> Also, if some sort of low frequency attenuation wasn't used, then the
> amplitudes of low frequencies would have required their attenuation to keep
> the groove spacing down.  I believe that they saw their options in 1925 as
> either 1. attenuate the bass or 2. provide a constantly wide groove that
> would have accommodated the lowest frequency on the new Orthophonic records
> [50 Hz].  The constant wide groove would have required a 12" diameter disc
> to hold what was previously held on a 10" acoustic disc.
> So the attenuation won out.
> 
> I personally have been very amazed that no corresponding bass boost on
> playback was ever provided in the earliest electrical playback equipment
> such as the Victrola 10-51 electrically amplified record changer.
> 
> 
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