[78-L] 78 grove spacing

[David Lennick]

There are some late 30s Columbias that have distinctly varied pitch, visible to 
the naked eye. I don't know why, because these spacings don't seem to 
correspond to changes in the music or the spoken word (notably obvious in some 
Shakespeare performances) and to the best of my knowledge, these are not dubs.

dl


On 8/14/2019 7:59 PM, ron at fial.com.invalid wrote:
> I saw no activity, so I was just testing that everything was OK on the 78-L server.
>
> Here is a question.   I know that grove excursion must be limited to keep loud low-frequency
> passages from breaking to an adjacent grove when cutting a record.  This can be done with
> level limiter, volume compression and (egads) clipping and low frequency limiting.
>
> I recall that in the vinyl era there were automatic means to create greater grove spacing for
> loud passages.  I could be mistaken.
>
> What methods were used for 78-RPM records.  Was someone riding the volume control and
> watching the VU meter, when that came along.  What technologies if any were used and
> when did they come along.  There may have been allowance for the grove getting wider with
> many playings, right?  I suppose a microscope used on acoustic and early electricals would
> reveal much.    Any one here already know?
>
> Ron Fial
>
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