From: utzoo!watmath!watcgl!dmmartindale Newsgroups: net.audio Title: Re: Pinch rollers and biasing Article-I.D.: watcgl.103 Posted: Thu Jan 6 09:33:14 1983 Received: Fri Jan 7 00:51:50 1983 References: grkermit.259 Ok, can Freon TF be used to clean pinch rollers? It seems to be what's recommended for cleaning all the parts of our computer tape drive - capstan (which seems to be rubber-covered), rubber pads on supply reel hub, heads, everything. The stuff is now sold by Radio Shack so should be available to almost everyone out there. And it doesn't attack plastic (even alcohol does attack some plastics). Just don't get it into any bearings - it's really good at dissolving oil or grease. Re magnetization of heads: There is no bias current when you're just playing tapes, and most recorders are used for playing most of the time. Virtually all car decks are play-only. I believe that the magnetism builds up during play, not recording. Dave Martindale