The Greer Studio 10 is an amazingly versatile amp. Featuring output between 3-10 watts depending on your choice of power tube. All tube construction. Will accept JJ 6V6, 5881, 6l6, EL34, or 6550 tubes without the need for rebiasing. Stock with an Eminence Copperhead speaker, it delievers a hybrid of classic 'Fullerton' era tones at a very reasonable volume, making it perfect for recording and small jams. Changing the power tube revoices the amp and yields an amazing array of tones. It sounds full and rich, but still punchy with the right amount of high end bite. Also great with pedals! Power Output: 3-10 Watts Output Tubes: 1 x 6V6, 5881, 6L6, EL34, or 6550 (Cathode Biased) Preamp Tubes: 1 x 12AX7 Rectifier:1 x 5Y3 or 5AR4 (Must use 5Y3 with 6V6's) Controls: Volume, Tone