[Table of Contents]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [ARSCLIST] Record Diameter (was: playback curves for some 78s)

If memory serves, the smaller 1930s diameter was required to clear the jukebox mechanisms. I've heard that Decca, gunning for the jukebox market, had made its first release in the slightly larger size and had to redo it. I don't know if they used different presses or adjusted the plate area appropriately- my guess is the latter.

Steve Smolian

----- Original Message ----- From: "Michael Biel" <mbiel@xxxxxxxxx>
To: <ARSCLIST@xxxxxxxxxxxxxxxx>
Sent: Monday, May 18, 2009 4:05 PM
Subject: [ARSCLIST] Record Diameter (was: playback curves for some 78s)

I sent this out last night under a different subject title but didn't see it get posted or even get a duplicate posting rejection, so I am trying again with some added information. Maybe my joke in last night's revision of the subject line was blocked?

From: "Steven C. Barr" <stevenc@xxxxxxxxxxxxxx>
Reissues of original Columbia or Okeh records from the 1925-3? era
are VERY commonly dubs...since the originals were 10.25" discs and
the stampers don't fit onto modern-day 10" records...! Steven C. Barr

Get out a ruler and some records, Steve. You (and most others here) are in for a big surprise. Those "oversize" Columbia pressings are the ones that are 10-inches. Most other "10-inch" records are 9 7/8-inches. Many Columbia/ARC pressings from the 30s are 9 15/16-inches, and eventually got down to 9 7/8-inches. Yes it is true that the Columbia and Columbia-OKeh pressings are larger than later records, but the are not and never have been 10.25" . And many or most of the early George Avakian produced Columbia re-issue sets were master pressings, at least the earlier copies were. New stampers were always produced from the metal positives (mothers) because the center mounting hole sizes were different in from the late 30s on, so the outer diameter of the original metal part is not of consequence. What IS of consequence, of course, is the diameter of the outermost grooving, and that is what Steve was really talking about. I think that there occasionally were problems -- even in newly recorded items that had to be issued in a dubbed fashion if the cutting engineer goofed when setting the outer cutting diameter on the lathe -- but thre was enough lead-in space on most 1920s Columbias and OKehs to allow them to be reissued on the slightly smaller pressings from the later 30s.

Also, when those in the metric world call those records 25 cm, they are
the ones who are correct.

One other point, Edison Diamond Disc diameters can vary a great deal.
I've never checked to see if the outer grooving diameter on these also
vary, but the size the discs are ground down to after "printing" can be
seemingly random.

Mike Biel mbiel@xxxxxxxxx

[Subject index] [Index for current month] [Table of Contents]