Hello

See Ampex 456, bake Ampex 456, loathe it!  We have hundreds of tapes in our
collections on this stock, and it continues to come in with the new
accessions.

I bake them now for about 7 to 14 days at 52C for more success, otherwise I
have to keep putting them back in the oven.  12 hours does nothing anymore
and our vaults are humidity/temperature controlled.  The really bad ones I
do use a pellon wipe and then, if required, my isopropyl technique (last
resort).  My low friction Studers have eliminated much use of iso.

Cheers
Marie

On Fri, Jan 29, 2016 at 11:13 AM, Richard L. Hess <[log in to unmask]>
wrote:

> Hi, Steve,
>
> The Ampex patent has in its claims both 50 and 54 °C. That was where the
> higher temperature came from. It is still well below the Tg of the base
> film. (67 - 81 °C) (
> https://en.wikipedia.org/wiki/Polyethylene_terephthalate)
>
> Ampex patent here:
> http://www.richardhess.net/restoration_notes/USP5236790.pdf
>
>
>
>
> On 1/28/2016 4:10 PM, Steve Greene wrote:
>
>> I used to bake 15" quad reels with a high degree of success at 120F for 24
>> hours, with a long ramp down time of another 24 hours before handling it.
>> Knowing what I know now, I might go as high as 125F. 54C (130F) seems high
>> to me.
>>
>> Steve
>>
>> Steve Greene
>> Audiovisual Archivist
>> Nixon Presidential Library and Museum
>> National Archives and Records Administration
>> (301) 837-1772
>>
>> On Wed, Jan 27, 2016 at 8:38 PM, Corey Bailey <[log in to unmask]>
>> wrote:
>>
>> Hi David,
>>>
>>> My experience with baking 2" tapes comes from my experiences at Warner
>>> Bros. Studios, Burbank, CA. As Richard Hess said: "456 is the poster
>>> child
>>> for SSS" so, don't ask, just bake it.! Regarding the question of how long
>>> to bake is dependent on the size and type of oven, the number of tapes to
>>> be baked at one time and (obviously) the condition of the tapes
>>> themselves.
>>> The oven at WB is commercial grade, capable of baking 34, 10.5" reels at
>>> a
>>> time. I've baked as few as two reels on up to an oven full. For two reels
>>> of 2", the average baking time is 18 - 24 hours. I would suggest that you
>>> only bake as many tapes as you can process in a day so that the
>>> stabilization process is as fresh as possible. You mentioned leader
>>> breaks.
>>> Expect any splices to have to be replaced after baking. Not always the
>>> case
>>> but, build the labor cost into your budget.
>>>
>>> Cheers!
>>>
>>> Corey
>>> Corey Bailey Audio Engineering
>>> www.baileyzone.net
>>>
>>> On 1/27/2016 8:29 AM, David Crosthwait wrote:
>>>
>>> Hello Tom and Richard,
>>>>
>>>> In my digging through a church archive yesterday with new clients, we
>>>> uncovered many reels of 24 track on 2" among other audio tapes. One
>>>> tape of
>>>> interest I have with me, destined to a comrade here in town who is as
>>>> passionate about vintage audiotape recovery as we are with videotape,
>>>> is a
>>>> 24 track on "Ampex Grand Master" 456 from 1988 in a cardboard box. It
>>>> has
>>>> track assignments within. The tape has leader breaks. In a test of
>>>> sorts,
>>>> we are going to link this up with a 1" C of the concert (same
>>>> production,
>>>> same date) to create a new stereo mixed version. I've done this before
>>>> so I
>>>> am familiar with the routine. The question to you two (and others) is:
>>>> What
>>>> should we expect from a stickiness standpoint (if any) from 1988 vintage
>>>> "Grand Master" 456?
>>>>
>>>> The client has multiple reels of this concert so this is a test of
>>>> sorts.
>>>> The 24 track will create a ProTools session for the mix down and new
>>>> stereo
>>>> imaging (5.1?), to be done at the client's facility. I'm going to be
>>>> remastering the 1" C today to file (it too is in stereo albeit with weak
>>>> L-R imaging as viewed on the phase scope). It's a full orchestra with
>>>> choir.
>>>>
>>>>
>>>> Thank you.
>>>>
>>>> Best Regards,
>>>>
>>>> David Crosthwait
>>>> DC Video
>>>> Transferring NTSC, PAL&  SECAM Two Inch Quad and Helical Source Tapes
>>>> (and More)!
>>>>
>>>> http://www.dcvideo.com/what-we-do
>>>> [log in to unmask]
>>>>
>>>> www.dcvideo.com
>>>>
>>>> Follow DC Video on Facebook: https://www.facebook.com/dcvideo
>>>> Follow DC Video on YouTube: http://www.youtube.com/user/dcvideoonline
>>>>
>>>>
>>>>
>>>>
>>>
>> --
> 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.
>