It did not take long for Rocktron’s newly released Valvesonic Plexi guitar preamp to receive its first honor, having been awarded a Guitar Player Magazine Editors’ Pick Award in the June (2018) issue of the magazine. Several years in the making, the Valvesonic Plexi  all-tube preamp replicates the tones of British amps from the 1960’s to the 1990’s.  Guitar Player …