Hi, Lou,

Yes, the width is a major factor. I should have been clearer that we 
need to discuss each width differently. I don't know what widths Paul 
was referring to, but Marie's work is overwhelmingly 1/4-inch, and mine 
is mostly 1/4-inch with some 1/2- and 1-inch thrown in.

For an extensive discussion of heat and moisture see

Martin Vos, Gary Ashton, John Van Bogart, and Ron Ensminger, "Heat and 
Moisture Diffusion in Magnetic Tape Packs," IEEE Transactions on 
Magnetics, Vol. 30, No. 2, pp 237-242, March 1994.

Thanks, Lou, we will have to make sure we're comparing for like widths.



On 1/29/2016 1:17 PM, Lou Judson wrote:
> Keep in mind the 2” factor, yes? I would not be surprised if the 2” was the difference… or even 2” for export?
> <L>
> Lou Judson
> Intuitive Audio
> 415-883-2689
> On Jan 29, 2016, at 9:57 AM, Richard L. Hess <[log in to unmask]> wrote:
>> This has been a great thread--and I'd like to focus on one part of it.
>> Perhaps there was a different version of Ampex 456 sold into the Commonwealth? Could that be? Although I think all of the 456 I have had has come from Opelika.
>> Ted in the UK, Marie in NZ, and I'm in Canada and we are all seeing extended baking times for 456 and related tapes much of the time.
>> The problem is it's easy once you see the need for extended baking times to make it part of your protocol. It does no damage, whereas insufficient baking can create a problem.
>> But, we have Tom saying he hasn't seen the need and that concurs with the Library of Congress's experience.
Richard L. Hess                   email: [log in to unmask]
Aurora, Ontario, Canada                             647 479 2800
Quality tape transfers -- even from hard-to-play tapes.