The Zodiac 30 is based on the famous Selmer Zodiac twin 30 as used by Jack White and the Arctic Monkeys. This version is slightly modified to use 6l6GB tubes,. Single channel and simple volume and treble roll off tone control. The master knob controls the voltage supplied to the whole amp, for full on crunch at bedroom volumes or anywhere in between. Has a very scooped midrange sound with ample bass and lots of sparkly treble, very indy rock, loves single coils. Tube complement is a pair of 12ax7s, an ef86 and a pair of 6l6gb tubes. Cathode biased so it puts out about 25-30 watts into an 8 ohm speaker load.