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Hi, Stewart,

If they are going to respond to baking, that might be a bit on the shy 
side. Since you've already done that, try one at 48 hours. The Ampex 
patent says 50 and 54 °C so that's about 122 and 129 °F so I would try 
the tape at maybe 125 °F or so. I'd use a thermocouple probe and make 
certain my temperature swings don't go above 130 °F.

Anyway, I don't expect it will work, but it's worth a try as baking is 
much easier than D5. I would use a tape you've already got a semi-good 
transfer from for the extended baking.

Do you know the type of the tape?

There's more insight into reel baking here:

http://richardhess.com/notes/formats/magnetic-media/magnetic-tapes/analog-audio/degrading-tapes/


Cheers,

Richard

On 2/26/2016 1:51 PM, Stewart Adam wrote:
> Hi Richard,
>
> I baked them for 5 hours at 120F
>
> Thank you
>
> Stewart
>
>> On Feb 26, 2016, at 1:23 PM, Richard L. Hess <[log in to unmask]> wrote:
>>
>> Hello, Stewart,
>>
>> How long did you bake? At what temperature? What kind of oven?
>>
>> There are some cassettes that do not respond to baking. In fact, I think a smaller percentage of cassettes do respond to baking than reels.
>>
>> This is why I use D5 (decamethylcyclopentasiloxane) for this. It ultimately evaporates.
>>
>> I place a cotton swab in an existing supply-side hole and inject that swab with D5 using a syringe.
>>
>> My paper on tape degradation that was originally presented at the Audio Engineering Society's 121st convention in October 2006 in San Francisco was published in the ARSC Journal in the Fall of 2008. It is available here:
>> http://www.richardhess.com/tape/history/HESS_Tape_Degradation_ARSC_Journal_39-2.pdf
>>
>> (the above two lines need to be combined into the URL).
>>
>> Cheers,
>>
>> Richard
>>
>>
>>
>> On 2/26/2016 11:11 AM, Creative Audio Works DAW wrote:
>>> Hello,
>>>
>>> I am transferring a large collection of cassettes and have a few that seem to have scrape flutter.  These tapes are from the early and mid 70’s.  I have tried playing them on several decks and there where no changes.  I tried reshelling them thinking there might be some drag in the shell causing it. No change.  I also tried baking them but I did not expect that it would help. It did not.
>>>
>>> I have a Studer A710 that allows me to access the sides of the cassette shell.  I was thinking of drilling a hole in the left side of the cassette and spray something that might help lubricate the supply tape path.
>>>
>>> Any suggestions would be greatly appreciated.
>>>
>>> Thank you
>>>
>>>
>>> Stewart Adam
>>>
>>> Creative Audio Works LLC
>>> [log in to unmask]
>>> 508-747-1858
>>>
>> --
>> Richard L. Hess                   email: [log in to unmask]
>> Aurora, Ontario, Canada                             647 479 2800
>> http://www.richardhess.com/tape/contact.htm
>> Quality tape transfers -- even from hard-to-play tapes.
>
-- 
Richard L. Hess                   email: [log in to unmask]
Aurora, Ontario, Canada                             647 479 2800
http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.