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Thanks so VERY much for the information. I am getting some sound out of a
3.8 mil stylus, which is the biggest I have. Both Ward and Seth confirm the
need for a larger stylus. Ward also suggested the use of vinegar to clean
the records, but I think I will follow your suggestion. Even with the age
of the discs and the technology of the time, coupled with my lack of an
appropriate sized needle, I am amazed that the sound is as good as it is.

Should anyone have the interest, the four sides are from the MET broadcast
of 19 January 1935 and might be the only surviving examples from that
performance.

Thanks.

Karl

On Fri, Jan 15, 2021 at 5:48 PM Graham Newton <[log in to unmask]>
wrote:

> On 1/14/2021 11:40 AM, Karl Miller wrote:
>
> > I have some recordings made in 1935. They are vertical cut, ten inch,
> > recorded at 33 rpm. While the labels are covered, I am assuming they were
> > embossed on one of the Victor home recorders.
>
> > After trying six different needle sizes, I found that a
> > microgroove needle seems to work the best! I am trying to track it as
> > lightly as possible. I recall that these discs were pregrooved and
> embossed.
>
> Hello Karl...
>
> The Victor "home" disc recorder embossed the sound on pre-grooved
> pressings
> using a 6 mil conical "needle" to both laterally emboss and play
> recordings.
>
> I confirmed this a while back when I obtained a pair of the actual
> "needles"
> sold by Victor for the purpose.  I had Expert Stylus in the UK re-tip a
> Stanton
> stylus assembly, duplicating the size of the original Victor "needles", to
> use
> for transferring these recordings.
>
> The embossing happens on the upper edges of the "U" shaped groove and if
> you
> use a smaller stylus it falls the the bottom of the groove where there is
> no
> audio to be found!  The playback "needle" must ride on the top of the
> groove to
> "hear" the audio.
>
> > Do any of you know what sort of fluid might be the best (safest) to clean
> > the discs.
>
> Kodak Photo-Flo 200 diluted 1:200 is probably the safest.  It can be mixed
> in
> other ratios  3:200  and  6:200   if need be to make the resulting mixture
> properly "sheet" on the disc.
>
> The Disc Doctor's velvet brushes are excellent for the cleaning job.
>
>
>
> ... Graham Newton
>
> --
> 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.
>