[78-L] 78 grove spacing

[Malcolm]

Hi Ron -
I would suggest you take a look at the 1969 Howard M. Tremaine reference 
book, Audio Cyclopedia.
It's still a must for learning about all sorts of recording technology, 
especially the "obsolete" stuff.
You can find it online for free at
https://archive.org/details/AudioCyclopedia
For a good start go to section 14 on Cutting Heads, beginning on page 693.
The whole book is filled with great material.
I've used my copy, which I bought in 1970, many times over the years.
Have fun!
Malcolm

*******

On 8/14/2019 1:59 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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