To my way of thinking blue is wrong because it gives a false colour to the dial. The first time I saw a (single) blue LED I thought it was excellent, and there are situations when they can look great. However, everything was designed by Sansui (colour wise) for the 'off white' illumination provided by incandescent bulbs and anything other than that wouldn't look right. In case it isn't obvious by now, I am a hopeless Sansui 'die-hard' and even think that 'pure white' LED's would look wrong. I have a Sansui TU-719 whose dial illumination is the same as the TU-717, and couldn't imagine it with blue, to me it would look awful. However, I would be entirely happy to fit 'off-white' LED's to mine.