NOS JAN/GE 6189/12AU7 Vacuum pre-amp tubes. Great for lower gain high fidelity applications or just to change the tone of your pre-amp section. Make and offer!!

6189 is the same as a 12AU7WA which is a ruggedized 12AU7. The extra support rods and mica insulators allow it to withstand shock and vibration. RCA's tube manual dos not say much other than that, but Tung Sol's specification for the 6189 says that it has tighter control of gm, plate current and amplification factor.

Telefunken's spec for the ECC802S and Siemens' spec for the E82CC say that they are 12AU7WA/6189.