[78-L] 78 grove spacing

[Kristjan Saag]

Not just cosmetic. It did save space. The sides contained more music.
Kristjan

On 2019-08-15 16:57, BURNHAM wrote:
> 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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