Randall RM20HBE + GRAIL MTS module Single modular channel 20 watts EL84 power tubes Master "Density" & "Presence" controls Tube Boost function "Boost Gain" control for desired distortion "Boost Level" control to adjust the boost volume Dual function "Standby" switch for live and silent mode Series effects loop XLR "Mic Eliminator" direct output 8/16 ohm ext. speaker output Slave output Rear panel power tube bias test points GRAIL MTS module Randall MTS High Gain Grail Preamp Module – Searing ‘80s Leads for your RM or Lynchbox Amp This amp has been mostly unused and gathering dust, but it was checked and biased by an amp technician, and is in good working order. It's 20W, but you can play it at home without any problems if you adjust the volume. You can get enough distortion with just the GRAIL module, without even turning on the RM20HBE's Boost Switch.