"Joule LA300 ME if you need gain and buffering for impedance matching between sources "
Besides fantastic "magical" sound LA-300ME can have and unity gain and variable up to 11 dB and you don;t have to buffer your signal if you don;t need it: all J-E preamps have two outputs, one direct from gain stage (what today BAT does) and, and buffer in case you need it.
and I will add that tube life span is 5- 10 years and with high impedance amplifier its double.
and on the top of it, J-E preamps usually 24/7 in standby mode - so there is no need to wait for warm up, just flip switch from standby to operate..
and least important ...that Garry pearson called "the mst romantic preamplifier..." preamp to die for !!!!!!!!!!!!