[78-L] 78 grove spacing

[BURNHAM]

I don’t pretend to know more about this than Mr. Lennick in this business, but I can think of two reasons why they might have done that - first, purely cosmetic, to give the record the appearance of containing more music than it actually does and second, on a particularly short record, to make sure the arm is well into changer tripping territory when the music ends. 

db





Sent from my iPhone

> On Aug 15, 2019, at 8:56 AM, Jeff Sultanof <jeffsultanof at gmail.com.invalid> 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
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>> 
>> 
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