[78-L] Approximating 78s age by physical characteristics

[David Lennick]

US Columbia also pressed from dubbed masters for a couple of years, even on 
classical recordings, to avoid that eccentric groove that all the EMI labels 
were using as of the merger.

dl

On 3/4/2013 10:31 AM, Royal Pemberton wrote:
> Curious about Victor saying publicly they're OK with other companies using
> the eccentric stop groove in November 1934....I wonder if Columbia ran into
> trouble with them earlier in the year?  As the few May 1934 Columbia sides
> I have end with eccentrics and the August 1934 Columbia I have, 2942-D,
> which has (AFAIK) the lowest numbers in the CO-prefixed ARC numerical
> series (CO.15541 and 15542) has instead the older concentric stop groove.
>
> On Mon, Mar 4, 2013 at 3:06 PM, Milan Milovanovic<
> milanpmilovanovic4 at gmail.com>  wrote:
>
>>
>> Consider including raised blank outside area on some early pressings. Think
>> they used it to block needle slippage from the beginning of record. The
>> same
>> method used for inside area with no locked and lead-out groove - raised
>> portion of the record used as for later transferred into locked groove.
>>
>>
>> ----- Original Message -----
>> From: "David London"<jusmee123 at gmail.com>
>> To: "78-L Mail List"<78-l at klickitat.78online.com>
>> Sent: Monday, March 04, 2013 12:28 AM
>> Subject: Re: [78-L] Approximating 78s age by physical characteristics
>>
>>
>>> On 03/03/13 23:10, Mark Bardenwerper wrote:
>>>> I can't add much to this, but it should be noted that many of the
>>>> groove additions came with the invention of automatic changers. The
>>>> change in labels had to do with the manufacturing process. The
>>>> beginning of the electrical era had something to do with some of these
>>>> changes. Before electrical recording, there were electrically driven
>>>> platters. Someone more in the know might tell us if there was a
>>>> workable changer in the acoustic era. It would have been a challenge
>>>> due to the heftiness of the arm, but people could be pretty imaginative.
>>>
>>> I was wondering also, if changers existed before lead-in grooves. It
>>> seems a key addition to a record, else you risk the needle just sitting
>>> floating on the leading edge of the record (or did they bias the arm to
>>> always swing inward when there was no groove?).
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>>
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