The Guild Thunderstar Combo is a versatile and unique amplifier. This monster is packed full of tonal options. 2 channel's with each channel having two inputs, a three position tone switch and  Volume Bass and Treble controls. Channel two also has Reverb and Tremelo controls. The 3 position switch controls Bright, Normal and dark tone. The amp is packed with several unique tubes. One Groove Tubes GT-7025, Two Sylvania 7591A's, One GE 7247, One Realistic Lifetime 12AX7A, two Fender 12AX7A's and a Cifté ECL86. The reverb and Tremelo on Channel 2 do not work and the pots could use some cleaning but all in all this amp is in fair condition. With a single 12'' speaker this amp sounds clean and loud when dialed in. Owned and used by the famous Indigo Ranch Studios, Sonic Circus now has the privilege to sell this classic amplifier.