Hi Tom,
If there is a "minimum" temperature that must be reached for baking to
be successful, it is well below 130 degrees F. I've come across several
batches of AMPEX 406 and Scotch 226 that required baking times much
longer than originally recommended by the AMPEX research. To be on the
safe side, I lowered the temperature to 120-125 degrees F. and baked as
long as necessary since I was extending the baking times or, effectively
baking for a second time. I simply adopted that as SOP. When it came to
digital audio tape, I was in some uncharted water so I started out at
115-118 degrees F., using the rationale that the tape backing and oxide
are much thinner than analog audio tape. I have since witnessed digital
audio tape baked at the original AMPEX recommendations with no apparent
damage. I have no science to back my "Lower & Slower" method, I simply
wish to err on the safe side. I think your concern about work flow as
stated in a later post is a valid one. If you see no reason to change
your methods, then go with what works for you.
Regards,
Corey
Corey Bailey Audio Engineering
www.baileyzone.net
On 6/2/2015 5:37 AM, Tom Fine wrote:
> Hi Corey:
>
> Isn't there a minimum temperature that needs to be reached for the goo
> to evaporate off moisture and get un-sticky? Have you discovered a
> temp lower than recommended in the Ampex patent? I thought Ampex did
> science and came up with the recommended temp because that was the
> minimum to return the binder chemistry to a playable (non-stuck)
> condition.
>
> -- Tom Fine
>
> ----- Original Message ----- From: "Corey Bailey"
> <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, June 01, 2015 8:53 PM
> Subject: Re: [ARSCLIST] Baking tapes on plastic reels ?
>
>
>> Hi Carla,
>>
>> I didn't join the original discussion but wanted to add that a number
>> of audio engineers (like myself) have adopted the policy of using
>> lower temperatures and longer baking times when it comes to
>> dehydrating audio tapes. Not wishing to throw fat on the fire but, it
>> may be worth looking into plus the fact that lower temperatures may
>> lead to a safer environment for plastic reels. As far as damaging
>> plastic reels, I have not experienced the problem at any of the
>> recommended baking temperatures.
>>
>> I have also documented SS on some varieties of digital audio tape
>> which is what led to the change in baking temperatures and durations.
>> Contact me off-list if you like.
>>
>> Corey
>> Corey Bailey Audio Engineering
>> www.baileyzone.net
>>
>> On 6/1/2015 8:52 AM, Carla Arton wrote:
>>> Tom and Richard,
>>>
>>> I completely agree with you both. I will talk to the editors about
>>> getting
>>> the PDF updated regarding the issues you've identified so as not to
>>> confuse
>>> people when writing up specs.
>>>
>>> Thank you for your feedback.
>>>
>>> Best, Carla
>>>
>>> On Sun, May 31, 2015 at 8:44 PM, Nigel
>>> Champion<[log in to unmask]>
>>> wrote:
>>>
>>>
>>>> As well as a library-wind, putting a half-turn in the tape as it
>>>> leaves
>>>> the spool reduces edge-damage from a warped spool. Undoing the
>>>> half-turn as
>>>> it feeds the take-up spool makes everything tickety-boo again!
>>>>
>>>> Has anyone else experienced temporarily-warped plastic spools
>>>> caused by
>>>> very thin tape compressing the hub? Unlikely to be a problem in a
>>>> studio
>>>> environement but here in academia........
>>>>
>>>> Nigel
>>>> ________________________________________
>>>> From: Association for Recorded Sound Discussion List [
>>>> [log in to unmask]] on behalf of Tom Fine
>>>>
>>>> Where did this phantom concern about warped plastic reels come
>>>> from? As I
>>>> said, who cares if they
>>>> are a little warped? Just library-wind the tape off them and
>>>> replace them.
>>>>
>>>> -- Tom Fine
>>>>
>>>>
>>>
>>
>>
>
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