LJ "6SN7 SRPP" is the "all rounder" line preamp, all music genre. Good sound-stage, good tonal balance, good vocal and music instrument. Is the most popular vacuum tube line pre amp, and the best-selling item within 5 years of the LJ Audio line products. Lead time: ready stock, or in 2 weeks if status is out of stock.
Model: LJ 6SN7 SRPP #6, July 2012. Old stuff: here.
Circuit topology: SRPP (shunt regulated push-pull), single-ended pure class A.