Currently Playing — at 78 RPM

3 minute wonder
Bob Dillon
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Re: Currently Playing — at 78 RPM

Post by Bob Dillon » 19 Mar 2019 21:57

Coffee Phil wrote:
19 Mar 2019 21:18
Here is something on the history of record materials:

www.

Aparantly Merco Plastic was a tradename for Mercury’s formula of PVC or polystyrene. Other record lables also had names for their formulas.

Phil
Thanks for the link. A few points to clear up in that article :

"Wax cylinders were the forebears of vinyl that we know today. In 1877, Thomas Edison invented the phonograph using cylinders wrapped in tinfoil"

The tinfoil machine recorded / played tinfoil sheets wrapped around a fixed mandrel.

"Edison and Aylsworth advanced the chemistry of records in 1912 when they brought in Condensite, a phenol-formaldehyde resin similar to Bakelite which had been invented five years previous. The sound and finish were far superior to shellac, but the high price of Condensite meant it wasn’t as popular."

Condensite was Edison's name for the varnish applied to the surface of the Diamond Disc. The quote makes it sound like it was the record material itself. Condensite wasn't ever "not popular" as far as I know , but it was substituted for a time in the WWI period with another formula, leading to Diamond Discs with a high degree of surface noise.

"The first vinyl long-playing record was launched in 1930, the 30cm flexible plastic discs were used for DJ copies as they shipped well and had superior broadcast sound, but didn’t prove popular with the general public."

Never heard of these 'DJ' records. Maybe confusing them with the RCA Victor 'Program Transcriptions' of the same time period, made for consumer use. They were 33 1/3 rpm discs and a market failure, partly owing to the Great Depression, among other things. The superior fidelity can be debated as many of them were dubbed from 78 rpm discs. The PT's resemble a hard vinyl compositon, but RCA Victor called it 'Victrolac'. I have some, they aren't that quiet, either, not like modern vinyl.



Polystyrene ? Be surprised if that was used in any 78 production, due to the high tracking forces of 78 rpm players.

circularvibes
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Re: Currently Playing — at 78 RPM

Post by circularvibes » 20 Mar 2019 02:41

Polystyrene was used in some top hits series 78's, the kind with 3 songs a side. They were from the mid to late 50's. when "lightweight" electric pickups were finally commonplace. Some 10 and 12" LPs were also Polystyrene, Rondolette stereo 10" LPs come to mind.

Bob Dillon
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Re: Currently Playing — at 78 RPM

Post by Bob Dillon » 20 Mar 2019 17:27

I have had some of the Top Hit Series records around in the distant past. Wasn't cognizant that they were styrene.

cary114
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Re: Currently Playing — at 78 RPM

Post by cary114 » 21 Mar 2019 01:07

I was wondering about those top hit records I have whole stack of them.

Max75
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Re: Currently Playing — at 78 RPM

Post by Max75 » 20 Jun 2019 13:33

Arrived today from France :D
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BMRR
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Re: Currently Playing — at 78 RPM

Post by BMRR » 26 Aug 2019 21:34

Last edited by BMRR on 26 Aug 2019 21:36, edited 1 time in total.

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Re: Currently Playing — at 78 RPM

Post by BMRR » 26 Aug 2019 21:35


BMRR
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Re: Currently Playing — at 78 RPM

Post by BMRR » 26 Aug 2019 21:37


BMRR
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Re: Currently Playing — at 78 RPM

Post by BMRR » 26 Aug 2019 21:37


BMRR
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Re: Currently Playing — at 78 RPM

Post by BMRR » 26 Aug 2019 21:38


vinyl master
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Re: Currently Playing — at 78 RPM

Post by vinyl master » 27 Aug 2019 01:38

Man, those are sounding good, BMRR! =D>

Never heard that Doris Day record before, either... :-k

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Re: Currently Playing — at 78 RPM

Post by BMRR » 27 Aug 2019 01:42

Thanks VM! This album is from 1950 and I think it was also released on LP, but I couldn't resist the 78 version.

Bob Dillon
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Re: Currently Playing — at 78 RPM

Post by Bob Dillon » 27 Aug 2019 23:40

The sound on the Day/James records is very good. It's likely to have been recorded on an Ampex model 200 tape machine - and for the time period - probably at 30 i.p.s.

A properly mastered CD of this from the original tape could also sound great.

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Re: Currently Playing — at 78 RPM

Post by Coffee Phil » 28 Aug 2019 01:02

Hi BMRR,

Those records are very nice! It blows my mind to think that in the early '50s that would be regarded as pop music. Aren't we supposed to progress.

Phil
BMRR wrote:
26 Aug 2019 21:34

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Re: Currently Playing — at 78 RPM

Post by BMRR » 28 Aug 2019 13:40

Bob Dillon wrote:
27 Aug 2019 23:40
The sound on the Day/James records is very good. It's likely to have been recorded on an Ampex model 200 tape machine - and for the time period - probably at 30 i.p.s.

A properly mastered CD of this from the original tape could also sound great.
I've heard the CD version and it does sound great. The most noticeable difference is the lack of pops/clicks and surface noise, of course. If you set that aside, the overall sound quality isn't all that difference than the 78, which is a testament to how good 78s sounded toward the end of 78 production.

I'm not sure what curve Columbia used for 78s in 1950 but I think it must have been pretty close to RIAA because it sounds great through my RIAA preamp without any additional equalization.

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