hello all. have always found my answers here and am glad this site exists! one question......is there a speed control adjuster on the beocord 2400 type 2665 cassette. i  can't for the life of me find one ....i'm not an expert !!i found adjustments  for everything else but .it runs fine  and speed is ok on 440 hz tape i use...it's near enough for my ears!! is it solely down to the correct belt size ....any tips greatly appreciated. cheers .