syllabogram JU on Linear B tablets: KN 8a J i 01 & KN 20 Ji 22 (recto verso):

Here we have the first 2 examples of Linear B tablets with the syllabogram JU, first  KN 8a J i 01:

Knossos Linear B tablet 8a

and secondly, KN 20 Ji 22 (recto verso):

Knossos Linear B tablet 20ab

It is apparent fro these 2 tablets that it is probably impossible to decipher the syllabogram JU, at leasst for the time being. But however daunting the task to decipher it, we shall persist to the bitter end.