Are you guys talking about 2" 456? I haven't had this extreme a problem with 1/4" 456 and 406. The
one I've had to go 24+ hours with is Scotch 227. I just recently did some circa early 1980s 456, two
7" reels. They played just fine and left no residue I could see on the cleaning swabs, with 12 hours
baking and 12 hours cool-down.
-- Tom Fine
----- Original Message -----
From: "Ted Kendall" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, January 29, 2016 11:12 AM
Subject: Re: [ARSCLIST] Ampex 456 Grand Master: What To Expect?
> This chimes with my own experience - days are required now where once hours sufficed.
>
> About a week is the minimum bake that has had any real effect for some time now.
>
>
> ----- Original Message -----
> From: "Marie O'Connell" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, January 29, 2016 5:20 AM
> Subject: Re: [ARSCLIST] Ampex 456 Grand Master: What To Expect?
>
>
> 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.
>>
>
>
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