[78-L] Fwd: Frequency Response/Range for 78's

[Royal Pemberton]

Were all RCA's earliest 45s mastered with the 2A cutter or was it adopted
at some point after they introduced the 45?

On Wed, Aug 1, 2012 at 8:08 PM, Doug Pomeroy <audiofixer at verizon.net> wrote:

>
>
> Begin forwarded message:
>
> > From: Doug Pomeroy <audiofixer at verizon.net>
> > Subject: Re: Frequency Response/Range for 78's
> > Date: July 31, 2012 11:04:40 AM EDT
> > To: 78-list <78-L at klickitat.78online.com>
> >
> > The article from 1953 in Audio Engineering magazine, to which I referred
> > I my original post, was written by R. C. Moyer.  I have just received a
> response
> > from Nick Bergh:
> >
> >> Hi Doug,
> >>
> >> I believe the Moyer article is incorrect regarding the 1938 head
> improvement.  Original engineering documents and my own experiments with
> the Victor hi-fi cutter from 1932 confirm they were doing 10kHz in 1932.
>  It was dumbed down fairly quickly since nobody could play back 10kHz at
> home.  I think collectors could be correct saying that there is occasional
> response up to 12kHz in 1932/1933 Victor discs, which can be caused by poor
> adjustment of the hi-fi cutter.  It should be fairly rare and more of an
> accident probably.  They were really only after 10kHz.  The reason the 1938
> graph shows response to 8kHz is that they inserted a low-pass filter in the
> recording chain.  This was removed in the late 40s.  Nothing major changed
> from the 1932 cutter design until they adopted the Westrex 2A feedback
> cutter in the late 1940s, which is a very different sound.  All the other
> changes in sound quality from the 1932 hi-fi systems to 1947 are due mostly
> to the electronics, filters, mi
>  cs, limiters, etc. rather than the cutting head.  The 1932 gear sounds
> quite good.
> >>
> >> Best,
> >> Nick
> >
> >
> > Doug Pomeroy
> > audiofixer at verizon.net
>
> 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
> audiofixer at verizon.net
>
>
>
>
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