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ARSCLIST  January 2016

ARSCLIST January 2016

Subject:

Re: Ampex 456 Grand Master: What To Expect?

From:

Marie O'Connell <[log in to unmask]>

Reply-To:

Association for Recorded Sound Discussion List <[log in to unmask]>

Date:

Sat, 30 Jan 2016 08:23:52 +1300

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (189 lines)

I am talking mainly 1/4 inch but also 2 inch Ampex 456.
Marie

On Sat, Jan 30, 2016 at 6:12 AM, Tom Fine <[log in to unmask]> wrote:

> 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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