[procella]

Thanks for mentioning, five. I already had read this informative thread before. Frustrated by my own attempts to de-noise I thought I had to find out what experienced people say about it. I have a few shows which sound quite good, at least for their age and I will keep them as raw as possible, certainly I won't nr them.
Now these tapes from TV are different, the hiss is bad often and I don't think I will upload many of them. Probably I will use the dolby of the tape deck only to try to reduce the noise.