[78-L] Groove spacing - groove width

[Ron]

Hello;
I can't agree with Kristjan's choice of "a large table for different record
companies".  I only see a few record companies listed, it's mostly by
country; and there were literally hundreds of 78 recording equalizations.
However, this link www.esotericsound.com/Electronics/REQ2MAN.pdf gives you
access to the most comprehensive listing of recording curves for both 78 and
33 rpm discs.  There are FIVE pages of playback curve equalizations.
Incidentally, this chart shows that RCA didn't begin to change its turnover
frequency upwards until around 1935-38 [the chart shows RIAA turnover for
those years, and RIAA turnover is 500 Hz.  [The table is found starting on
page 6 of this Operating Manual.]

Ron Roscoe

-----Original Message-----
From: 78-l-bounces at klickitat.78online.com
[mailto:78-l-bounces at klickitat.78online.com] On Behalf Of Kristjan Saag
Sent: Saturday, November 19, 2016 7:02 PM
To: 78-L Mail List
Subject: Re: [78-L] Groove spacing - groove width


Thanks, all, for interesting information. Seems the switch to electric
recording had little effect on groove width.

As for playback EQ curves, here is a link to a website that deals a lot with
this, including a large table for different record companies.
http://wiki.audacityteam.org/wiki/78rpm_playback_curves#Table_of_EQ_Curves

I'm sure some of you have seen it; I may even have gotten the link from this
list.
As for reliability of its content I have no clue.
Kristjan

On 2016-11-19 22:58, Royal Pemberton wrote:
> Those very first Stokowski Victors have bass going down to roughly
> 70-80 Hz due to his using string basses on the recordings. They didn't 
> do that on later recordings most likely because they didn't work out 
> they'd recorded at all, as whatever they auditioned test pressing on 
> cut off at more like 200 Hz. I wonder what people thought the first 
> time they heard one of those first Stokowski acoustics years later on 
> Orthophonic acoustic or electric machines.... On Sat, Nov 19, 2016 at
> 9:35 PM, Ron L'Herault <lherault at verizon.net.invalid
>> wrote:
>> I suspect that since acoustics didn't have much bass, whatever 
>> improvement that came via Orthophonic playback was considered 
>> phenomenal. Ron L -----Original Message----- From: Ron 
>> [mailto:roscoer at verizon.net] Sent: Saturday, November 19, 2016 10:18 
>> AM To: '78-L Mail List' Cc: MOCAPS-L at yahoogroups.com Subject: RE:
>> [78-L] Groove spacing - groove width Weren't the first Vitaphone 
>> movie discs issued in 1926? I believe the first Vitaphone movies were 
>> shorts, but that in 1926 "Don Juan" was a silent film issued with a 
>> Vitaphone sound track comprised only of music and sound effects, no 
>> dialogue. Also, if some sort of low frequency attenuation wasn't 
>> used, then the amplitudes of low frequencies would have required 
>> their attenuation to keep the groove spacing down. I believe that 
>> they saw their options in 1925 as either 1. attenuate the bass or 2.
>> provide a constantly wide groove that would have accommodated the 
>> lowest frequency on the new Orthophonic records [50 Hz]. The constant 
>> wide groove would have required a 12" diameter disc to hold what was 
>> previously held on a 10" acoustic disc. So the attenuation won out. I 
>> personally have been very amazed that no corresponding bass boost on 
>> playback was ever provided in the earliest electrical playback 
>> equipment such as the Victrola 10-51 electrically amplified record 
>> changer. _______________________________________________ 78-L mailing 
>> list 78-L at klickitat.78online.com 
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