HELLO! I run a cassette tape label called Lost Sound Tapes and I duplicate all of my cassettes at home. I've had a Telex Copyette for 2-ish years now and had absolutely no problems with it until last week. I've duplicated about 1500 tapes on this machine.
I have a new tape to dupe and the copies being produced are now crackly and scratchy sounding. They sound as if the master was from an old record, not a bad sound it's just not what the master sounds like! Most people probably wouldn't even notice as it is a faint sound, but it's driving me up the wall when I listen back. I even tried duplicating from a master I've used with no problem in the past and it has the same results. I've also tried duplicating onto different cassettes. The ones I've been using lately are the 731 series tapes from National Audio Company.
So I purchased a cheapo head demagetizer from ebay and ran that over the heads (it has a rubber tip on it to protect). Also, I got one of those head cleaner cassettes from radio shack but realized it probably wouldn't work right on such a high speed machine (16x playback). So I just put the cleaning fluid on a q-tip and swabbed all of the heads/capstans + let them dry.
Still I'm having the same problems and I have 6 different cassettes to dub 100 copies of! Yikes! Maybe the heads need to be replaced finally? I bought the duplicator used and the previous owner did use it some, so I dunno. Maybe y'all have had a problem like this in the past? Any help in the right direction would be very very much appreciated.