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If you're doing a high-cut operation at 10KHz, you are cutting off some harmonics, with the result that you will be changing the audible characteristics of the sound; it may be "fuzzy" or grate on the ears. Of course, the noise is already doing that, so it's a tradeoff. If you absolutley can't get any kind of noise-reduction equipment [and are these "tapes" encoded with Dolby B, C, or XR noise reduction? if so you should be using it on playback, or the sound will be distorted as well as noisy], I would suggest a somewhat higher cutff. FM stereo, for instance, cuts off at 15KHz, which is usually acceptable, although the tape may also have a cutoff there which would leave all of your hiss below that frequency. Just in general, the more bandpass you have, the less "raggedness" there will be in the sound [it sounds to me like a saw, if that makes any sense :b ].
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