All tube amplifiers have their vacuum tubes tested on a state of the art Maxi-Matcher tube tester. All Tube sockets are re-soldered, cleaned and re-tensioned. Output tube bias is adjusted as a part of the repair procedure. All controls, jacks and switches are re-soldered and treated with de-oxidizing solutions. Some tone modifications may be offered if they are known to be reliable. All heads and combo amps are burned in to insure reliability. Output tube bias is always checked and adjusted.Contact us today to get started!