Marshall's solid states

hile renowned for their valve guitar amps, Marshall produces and sells a large amount of solid state and bass equipment. Marshall's Valvestate amplifiers were at the time seen as evolutionary, as they contained a hybrid of valve and solid state technology, to provide a modicum of "true" valve tone, along with transistor reliability and ease of maintenance. Currently named the "AVT series", there are a number of different models, all of which are cheaper than their all-valve counterparts. It is Marshall's current line of "hybrid" amplifier, featuring a 12AX7 preamp tube employed in the preamp (to "warm up" the signal) as well as solid state components, with a solid-state power amp. source: http://marshall-amps-guitar.com/solidstate