Re: Audio Devices, Inc. company history?
On 6/2/19 10:58 PM, Chuck Guzis via cctalk wrote: > I had a look at a couple of additional reels of Audio Devices tape from > 1965 and 1966. Both were darker and labeled with an "Certified for 800 > bpi" sticker and well as a "Heavy Duty Made with 1.5 mil DuPont Mylar". > > I'm concluding that the tape in question is pretty darned old. > I think so too. I uploaded the specification for IBM's 200bpi tape from 1960. http://bitsavers.org/pdf/ibm/magtape/IBM_Magnetic_Tape_Specifications_200BPI_Sep1960.jpg Coercivity is specified as no more than 280 oersteds.
Re: Audio Devices, Inc. company history?
I had a look at a couple of additional reels of Audio Devices tape from 1965 and 1966. Both were darker and labeled with an "Certified for 800 bpi" sticker and well as a "Heavy Duty Made with 1.5 mil DuPont Mylar". I'm concluding that the tape in question is pretty darned old. --Chuck
Re: Audio Devices, Inc. company history?
On 6/2/19 12:04 PM, Chuck Guzis via cctalk wrote: > Does anyone remember these folks? I only have one reel of audiotape, and that has a tag of being cleaned in 1968. I couldn't find any other chocolate brown oxide tapes with dates later than that. Maybe they died off with the switch to 800bpi (coercivity change with the darker formula)?
Audio Devices, Inc. company history?
I've got a few old reels of milk-chocolate brown 7-track tape here and was wondering if it's possible to date them accurately. The reels themselves have the Audio Devices name molded into them; the rear white flange is quite yellowed with age. The tapes have been used quite heavily as they've been shortened to much less than 2400'. I know that AD and EMI had a merger agreement with Capitol on their vinyl business around 1967 and that the result was spun off as EMI. That leaves the tape business. It seems that CDC acquired some or all of AD in 1969, but I can find no details. Does anyone remember these folks? They used to be *the* major tape supplier in the USA. --Chuck
