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We too have also seen increased baking times for 1/4" reels, though we haven't kept a detailed log. For 2", it definitely takes a lot more time, due to the increased heat capacity and the larger width (moisture has to travel further to escape). Ellis On Fri, Jan 29, 2016 at 10:42 AM, Richard L. Hess <[log in to unmask]> wrote: > 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. > > Cheers, > > Richard > > > > > 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 > http://www.richardhess.com/tape/contact.htm > Quality tape transfers -- even from hard-to-play tapes. > -- Ellis [log in to unmask] 818-846-5525