This is a great switchable OTL headphone amp. Perfect for those just getting into tubes and also seasoned tube veterans. I used this as my desktop amp at work. Takes a 12AX7 driver and 6BQ5 (EL84) power tubes. I used adapters to adapt the driver slot to 6SN7 and the power tube slots to 6V6. It has some scuffs here and there but is in overall good shape. I'm including the tubes and adapters as shown. 6V6G tubes are available separately via another listing if interested. Add your favorite 6SN7 and get ready to rock. Priced to sell.