Oh I doubt it wants to be something as obsolete as a CD; more likely it sees
virtual existence as a FLAC file as something to strive for.
In any case, see 14.17 in http://www.faqs.org/faqs/AudioFAQ/part7/ . The
squeal problem could be the mechanism in the cassette (there are a couple
guides that maybe need to be oiled...VERY carefully and lightly - but I've
never heard of or done this) or, more likely and especially if they are
Ampex cassette tapes, it's the dreaded binder problem spoken of in the FAQ.
I have this problem with many old Ampex 456/457 open reel and "GrandMaster"
cassette tapes. Ampex blew the formula; Maxell, for example, did not so
their tapes still play back fine (if they've been stored relatively well).
Baking at 130 degrees F for an hour or two for the open reels resolves the
binder problem temporarily, but long enough to be able to play them back and
capture the audio on the tape. The bake time for a cassette would probably
be somewhat shorter, maybe 45 to 75 minutes? Try it and see (preferably
initially on something that isn't very important) but do not go above 140F.
Mike
On Thu, 18 Dec 2008 11:39:14 -0800, John Burke <[log in to unmask]> wrote:
>Actually it's not a squeak - it's a whine - which is cassette tape speak for
>"I want to grow up to be a CD"
>
>John Burke
>(408) 515 4992
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Bill Campbell
>Sent: Thursday, December 18, 2008 8:55 AM
>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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