thanks for all your replies, as I've said I already have a graphic equaliser, a Kenwood KE 2060, which is in the amps tape loop, I only really use it to cut around the 1k mark, especially on CD's, which seem worse for the, what I can only be described as fizz, which also makes the bass stand out more, I'm a believer in cutting what you don't want rather than boosting what you do.
So I thought if I could get an amp with a mid tone control I could get rid of it, but it look like there isn't one, so I'll stick with what I've got