maybe the squeak is the final scene of the opera Aida. A soprane can make a drinking glass crack, so the casette is perhaps overloaded by an opera shriek...
Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bill Campbell
Sent: den 18 december 2008 17:55
To: [log in to unmask]
Subject: Re: [TN] Way off-topic: CrO2 cassette tape
As long as we're a little off topic: Does anyone know why sometimes cassettes develop a high pitched mechanical squeak? Also if there's a fix?
I have a few tapes that have this but would love to save long enough to convert to newer formats.
On Thu, Dec 18, 2008 at 9:28 AM, Simonik, Dave R. (David) < [log in to unmask]> wrote:
> From http://en.wikipedia.org/wiki/Cassette_tapes
>
> Cassette tapes are made of a polyester type plastic film with a
> magnetic coating. The original magnetic material was based on gamma
> ferric oxide (Fe2O3). Circa 1970, 3M Company developed a cobalt
> volume-doping process combined with a double-coating technique to
> enhance overall tape output levels. This product was marketed as "High
> Energy" under its Scotch brand of recording tapes.[14] Inexpensive
> cassettes are commonly labeled "low-noise", but typically are not
> optimized for high frequency response.
>
> At about the same time chromium dioxide (CrO2) was introduced by
> BASF,[15] and then coatings using magnetite (Fe3O4) such as TDK's
> Audua were produced in an attempt to approach the sound quality of
> vinyl records. Cobalt-absorbed iron oxide (Avilyn) was introduced by
> TDK in
> 1974 and proved very successful. Finally pure metal particles (as
> opposed to oxide formulations) were introduced in 1979 by 3M under the
> trade name Metafine. The tape coating on most Cassettes sold today as
> either "Normal" or "Chrome" consists of Ferric Oxide and Cobalt mixed
> in varying ratios (and using various processes); there are very few
> cassettes on the market that use a pure (CrO2) coating.
>
> Dave Simonik
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
> Sent: Thursday, December 18, 2008 10:07 AM
> To: [log in to unmask]
> Subject: Re: Way off-topic: CrO2 cassette tape
>
> Craig,
> Assuming all the Cr there is indeed in the form of CrO2, then whether
> it falls under RoHS is immaterial, as the Cr is present in the +4
> oxidation state, not +6.
> Bev
> RIM
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Craig Cullum
> Sent: Thursday, December 18, 2008 10:04 AM
> To: [log in to unmask]
> Subject: [TN] Way off-topic: CrO2 cassette tape
>
> Hi all,
> We're expecting a huge snowfall overnight and tomorrow and have been
> advised not to come to work.
> So . . . for me it feels like Friday, and here's my question:
>
> Do all my old metal-oxide cassette tapes, specifically the chromium
> CrO2 tapes, fall under RoHS regulations?
> Hypothetically, if I was in Europe, how would I safely dispose of
> these tapes?
>
> Just wondering.
>
> Craig Cullum, Engineering Technologist, AMTELCO
> e: [log in to unmask]
> [log in to unmask]
> f: 608 838 8367
> v: 608 838 4194, or 4197, x128
>
> Please visit us at www.amtelco.com
>
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