[78-L] 78 grove spacing

[Malcolm]

No problems, Jeff. I recommend the book to all and sundry. It's firmly 
related to stuff we do.
It's good to see some action on 78-L again! The August doldrums are 
coming to an end for
this year and none too soon for me.
Best to all,
Malcolm

*******

On 8/15/2019 2:56 AM, Jeff Sultanof wrote:
> Thank you, Malcolm. I just downloaded it.
>
> Jeff Sultanof
>
> On Thu, Aug 15, 2019 at 6:23 AM Kristjan Saag <saag at telia.com.invalid>
> wrote:
>
>>   From September 1950 Deutsche Grammophon's Archive series 78's had
>> variable pitch/ variable groove spacing, thus almost double playtime.
>> Polydor also used the technique for some of their 78's.
>> The technique, with control amplifiers connected to the tape machine, is
>> described on pages 649-650 in the Audio Cyclopedia.
>>
>> Kristjan
>>
>>
>> On 2019-08-15 01:59, 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
>>> _______________________________________________ 78-L mailing list
>>> 78-L at klickitat.78online.com
>>> http://klickitat.78online.com/mailman/listinfo/78-l
>>
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