(!!!) 12AU7A GE “”U”” getter low hours/tests like new 1957 (10.0/8.8ma)

1 low noise tube) 12AU7A GE “”U”” getter low hours/tests like new 1957 copper grid posts (warm / smooth / sweet sound)

1 section) 10.0ma Gm=2200

1 section) 8.8ma Gm=1900

Tested on Amplitrex

– Unison Research

– Head-Direct EF1 preamp

– Allen & Heath VF-1 compressor

– Ray Samuels

– Eastern Electric DAC

– Lexicon Signature 284

– Bravo