[Dixielandjazz] acetate or Cardboard

[RICK KNITTEL]

Bob;

Most 1920's to 1940's 78 rpm records were made from phenolic resin or
Baekelite. Acetate, I believe is cellulose acetate (similar to the
material used to make cellophane) but is probably the material you could
"cut" to make a one of a kind record or to use to make the masters in
another process (electrolytic) to make molds to press 78 phenolic
records.

1950's through 1960's LP's and 45's were originally tried in phenolic but
when PVC (polyvinyl chloride) became available, it was found to be much
better at replicating the finer grooves than were in 78 rpm recordings.
The masters for these were usually made on coated metal plate that would
be used in the electrolytic process to make the molds to press the LP's
from PVC (vinyl)

Carboard laminated with PVC could be used to make less expensive
recordings which were not as durable. 

The 1970's and 80's found music on tape (cassettes cartridges etc) and
then came digital on CD's and MP3's

Regards

JAZZBONE

On Sun, 4 Dec 2005 12:37:03 -0800 "Robert S. Ringwald"
<robert at ringwald.com> writes:
> Listmates,
> 
> I have an argument going, well not exactly an argument, a friendly 
> discussion, with Mad Dawg.  He claims the material that the Bing 
> Crosby out 
> take would have been pressed on is cardboard with some sort of 
> plastic 
> coating like what home made records were made of back in the 50s.  I 
> 
> remember those as my parents had one of those turntables.
> 
> As I remember, the flexible 78 that my grandmother had was more like 
> a LP. 
> I don't think it was cardboard but it could have been as Mad Dawg 
> says, 
> cardboard with a coating of something.
> In an post from Bill Haussler, who also had that recording, Bill 
> says it was 
> acetate.  Is acetate, cardboard?  Or what they make LPs out of?  or 
> was 
> acetate the hard material that most 78s were made out of?
> 
> 
> 
> 
> 
> 
> --Bob Ringwald K6YBV
> The Fulton Street Jazz Band
> The Boondockers (Jazz and Comedy)
> 530/642-9551
>  
> 
> 
> 
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> 
> 


Rick Knittel - RK Associates, LLC - Film Extrusion Engineering Services
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