[78-L] Groove spacing - groove width

[Ron]

I think you mean bass CUT on recording.  I'm pretty sure that the
250Hz-300Hz turnover stayed for a long time.  I would like to know where you
get the 500 Hz value; perhaps I missed it somehow!  But, I honestly think
that the 500 Hz turnover would have provided a seriously noticeable
low-frequency loss in playback without any compensating playback bass boost.
Do you think that the bass boost only started to occur when crystal
cartridges became widely used?  A crystal has a natural playback
characteristic that includes some bass boost as well as treble cut.  I think
that by the time crystals became widely used the recordings were also made
with treble boost to help cut the high-frequency record noise.

Gary Galo has written a wonderful account of record equalization:  "Disc
Recording Equalization
Demystified By Gary A. Galo"  I don't have the magazine title from which the
article came but you can download the article here:
www.novotone.eu/_site/projets/Projet06/Doc01.pdf
Gary, love to hear what you have to say about this!

Yes, I have also viewed the 10-51 schematic.  I have a friend who has a huge
collection of pre-1930 Victor consoles with either changers or single play
turntables and he claims NONE of them have compensating bass boost for
playback.  That's why I wonder when the playback equalization might have
begun.
Fascinating topic!

Ron Roscoe

-----Original Message-----
From: 78-l-bounces at klickitat.78online.com
[mailto:78-l-bounces at klickitat.78online.com] On Behalf Of J. E. Knox
Sent: Saturday, November 19, 2016 12:39 PM
To: 78-L List
Subject: Re: [78-L] Groove spacing - groove width


Greetings from FixitLand!

Kristjan Saag wrote:

> When recording went electric one of the consequences was the ability 
> to avoid overcutting - it became easier to control loud signals. Thus 
> groove spacing was affected: the number of grooves per inch or 
> centimetre was increased, recording time per disc side could also be 
> increased.
> But apart from groove spacing - is there any evidence that groove 
> width was affected as well? As we know different record companies used 
> different groove width both before and after the advent of electric 
> recording, and it's also clear that groove width generally decreased 
> with time. But I've seen no mention of a major change haven taken 
> place due to electric recording.
> Does anyone know more about this?