TAD Röhren
TAD Premium Selected tubes Premium matched power tubes and premium selected preamp tubes and rectifier tubes. We offer Free shipping to any EU country above 200,-Euro of order.
TAD is a German base company and does all TAD Tube quality control processing in-house under strict control of high qualified technical staff. TAD technicians which are also musicians and guitar players, developed and constructed the TAD own custom tube testing systems and aging rigs to run tubes in real amplifier circuits and operation conditions.
TAD real tube quality control is way more than just a simple test. Before a TAD Tube gets accepted at all TAD performs extensive sample evaluation testing for consistency, power test, shock resistance test, soak test (long term operation at full power) and of course a musical test in known amplifiers to learn about its sound character in different styles. The main tests are made after a proper pre-aging to stabilize the cathode emission. While most tube test equipment does work at 250V as a maximum TAD build the test rig to operate at voltages of 360 to 600V depending on the tubes being tested. Every TAD Tube is tested by TAD qualified staff. Each pentode is inspected, tapped while operating and listened for noise floor, hum and odd noise.
Finally measured for a set of parameters and matched by Ia (PC) and Gm (TC). TAD does test batches of 400 to 500 pieces per run to allow tightest tolerances of typically 0.5mA for PC. All TAD Tubes and boxes get labeled with the PC and TC test results and a unique serial number to identify every tube TAD has ever tested. TAD permanently verifies and monitors selected and matched TAD Tubes by using them every day in own amp service department and in the TAD Amp Kits. This is the most complete quality control system is possible and all done in-house at TAD in Germany.