jpmorris
Tape Wolf
I've just discovered that my A807 isn't doing quite as good a job as I had hoped. Basically, when listening to recorded test tones playing back, I realised that they were accompanied by a variety of rather unpleasant rumbling-type sounds.
I'm fairly certain that this means the thing is under-biased, though I'd welcome any info on the subject. If need be, I can probably record a sample of what it has been doing, but that will probably have to wait until I feel better about it all. (I've laid down an entire side with the machine in this condition, which I guess will have to be remixed now).
Thing is, I haven't been able to follow the steps in the manual for setting the record bias properly. It recommends an input level of -20db, but that seems to be too low for any of the meters I have. Hence, I used a higher level tone for the adjustment, and that seems to have screwed things up.
As an experiment I adjusted the biasing by ear. It is possible to set it such that the noises go away, but then it seems to be overbiased to the point at which the 10khz tone won't even show on the meter.
Any suggestions? Would a 'scope work instead of a meter?
I'm fairly certain that this means the thing is under-biased, though I'd welcome any info on the subject. If need be, I can probably record a sample of what it has been doing, but that will probably have to wait until I feel better about it all. (I've laid down an entire side with the machine in this condition, which I guess will have to be remixed now).
Thing is, I haven't been able to follow the steps in the manual for setting the record bias properly. It recommends an input level of -20db, but that seems to be too low for any of the meters I have. Hence, I used a higher level tone for the adjustment, and that seems to have screwed things up.
As an experiment I adjusted the biasing by ear. It is possible to set it such that the noises go away, but then it seems to be overbiased to the point at which the 10khz tone won't even show on the meter.
Any suggestions? Would a 'scope work instead of a meter?