(!) 6189=12AU7A GE NOS 1975 (9.6/10ma) 1-2% section balance

1 low noise tube) 6189=12AU7A GE NOS 1975 copper grid posts in white box 

(warm / smooth / sweet sound, not bright) 

9.6ma Gm=2200

10ma Gm=2200

Tested on Amplitrex

- Unison Research

- Head-Direct EF1 preamp

- Allen & Heath VF-1 compressor

- Ray Samuels

- Eastern Electric DAC

- Lexicon Signature 284

- Bravo