The most demanding tube for both sound and build quality is Telefunken ECC 803S. This original tube can only be sourced from old inventories and not reliable sources offering no warranty period. There is the risk of forgeries, functionless valves or overpriced goods.

We tried to find a way to make a better product for high requirements of exclusive amplifiers.

E.A.T. has set a high standard by trying all existing ECC 803S by defining sophisticated selection methods to get only the very best to our demanding customers.

The selection procedure uses several measurements. All measurements are performed after a long burn-in procedure and thermal stabilization of its parameters. Only a few valves pass the Selection process and even fewer pass the strict Diamond selection.

The inseparable part of the Cool Valve ECC 803S is the E.A.T. Cool Damper. E.A.T. developed a special high temperature glue to fi × the damper to the valve glass envelope. This glue is designed to transform vibration energy into thermal energy, which is then dissipated as heat. The Cool Damper is a truly effective vibration & micro-phonic absorbing device.