3 x Telefunken EF89 (6DA6) valves / tubes, excellent condition, Berlin factory, diamond mark ◊ on bottom

You are buying 3 pcs of Telefunken EF89 (6DA6) valves / tubes in excellent working condition.

Produced at Telefunken, Berlin with a diamond mark ◊ on bottom (hardly visible for one tube).

We tested the tubes on our Tesla tube tester BM215A where the “GOOD” value for EF89 begins at 6.6mA (Ug1= -1.5V, Eg2=100V and Ea=250V), the 100% is 11mA. The tubes scored: 12.0mA, 12.0mA and 12.8mA, free of shorts and leakage (grid emission).

The heater of the EF89 is 6.3 volts. We also tested the tube at lower heating voltage of Uf=5.2V to check the lifetime. The tubes scored: 10.2mA, 10.8mA and 11.0mA – nearly to 100% (11mA) which shows extremely robust cathodes and a very long lifetime.

If you buy more than one item, please do not pay until we issue you an invoice for combined shipping.  The shipping will have a tracking number.