jadi jpDescription. Available in balanced (JPS2S) or unbalanced (JPS2) version. The Jadis JPS2 is a preamplifier which uses three ECC83 for the function and ECC82 to adaptDescription. Optimizing performance on a controlled budget is the credo behind this compact combo. The PA70 and JP7L, new comers to our power amplifier and preamplifier ranges,