As Dennis Rooney pointed out: "3M 176 and 177 both can squeal." Shai's post points out the need for a centralized database because this list is sprinkled with a wealth of valuable information on many subjects. Richard Hess maintains a page on audio tape known to have problems but he should not have to keep up a centralized database (He has other things to do, I'm sure). Anyone know of some good email mining software? My $0.02, CB Corey Bailey Audio Engineering www.baileyzone.net On 11/23/2020 5:59 AM, Dennis Rooney wrote: > Dear Shai, > > 3M 176 and 177 both can squeal, although your feline comparison is more > severe than what I ever experienced. When they were introduced in the 70s, > we put them into service in the news operations of the broadcaster I worked > for at the time and we noticed the squealing tendency then, so it is not a > consequence of age. Also *ab initio*, both tape types noticeably shed oxide > in use. However, those issues were not judged to cause any malfunction in > use and were in effect ignored. The formulation seems to have been one of > 3M's most stable but it is years since I have handled any. > > DDR > > On Mon, Nov 23, 2020 at 6:03 AM Shai Drori <[log in to unmask]> wrote: > >> Hi Tim >> They definitely do not need baking, they are dry and thus squealing. I was >> under the impression that they were just a thinner 176. The 176 is a great >> tape in my experience. >> >> On Mon, 23 Nov 2020 at 11:33 Tim Gillett <[log in to unmask]> >> wrote: >> >>> Hi Shai, >>> >>> I have a stack of 3M Pro Pack 177 (1 mil) n 10.5" reels. Not back >>> coated. Had them for about 40 years. All ex radio station log tapes. >>> Mostly they are OK but a little shedding so sometimes need more >>> cleaning of tape path than usual. Definitely nothing as bad as the >>> main SSS type tapes. I dont think I've ever baked any but have >>> thought they might need it if they ever got any worse. >>> >>> Cheers Tim >>> >>> ----- Original Message ----- >>> From: "Association for Recorded Sound Discussion List" >>> <[log in to unmask]> >>> To:<[log in to unmask]> >>> Cc: >>> Sent:Mon, 23 Nov 2020 11:03:02 +0200 >>> Subject:[ARSCLIST] Scotch AV177 sqealing >>> >>> Does anyone have experience with this formulation? I always thought >>> it was >>> the 1 mil version of the 176, but I have 3 tapes now that are >>> squealing worse than cats in heat. >>> >>> Cheers >>> Shai Drori >>> Expert digitization services for Audio Video >>> 3K scanning for film 8mm-35mm >>> Timeless Recordings Music Label >>> www.audiovideofilm.com >>> [log in to unmask] >>> >>> ------------------------- >>> Email sent using Optus Webmail >>> >> -- >> >> Cheers >> Shai Drori >> Expert digitization services for Audio Video >> 3K scanning for film 8mm-35mm >> Timeless Recordings Music Label >> www.audiovideofilm.com >> [log in to unmask] >> >