adamson@ITD.NRL.NAVY.MIL (Brian Adamson) (02/05/90)
Here's a question of a different sort, I've developed a weird problem as of late. My Fostex A-8 1/4" 8 track recorder has developed what sounds like a 60 Hz hum when monitoring the tape head of tracks 4 & 6. It sounds like a feedback loop of some sort. . . Demagnetizing doesn't help. Track 6 has been doing this intermittently for a little while. But as soon as I would record something to track 6, the machine would quit the himming until it was turned off and turned back on (on an intermittent basis, of course) However, track 4 started doing the same thing out of the blue last night and the same "fix" doesn't help any. Anyone ever heard of this problem before or have any ideas what I could do about it. I am sort of guessing possible failing capacitor or something in a pre-amp circuit that's giving me this feedback coupling or whatever it is.?????? help, Brian Adamson adamson@css.itd.nrl.navy.mil
JEFF@UTCVM.BITNET (Jeffrey R Kell) (02/06/90)
On Mon, 5 Feb 90 10:32:15 -0500 Brian Adamson said: >Here's a question of a different sort, > I've developed a weird problem as of late. My Fostex A-8 1/4" >8 track recorder has developed what sounds like a 60 Hz hum when >monitoring the tape head of tracks 4 & 6. It sounds like a feedback >loop of some sort. . . Demagnetizing doesn't help. Hmmm... (pun intentional)... do you have dBX on that deck by chance? (Just a stab in the dark...) Sounds like a problem I had with an old TEAC 3440 w/dBx add-on unit. The EQ chips are notorious for that, and the damn things are proprietary ICs (or at least were) for which you must custom-order at a premium price. /Jeff/