1 low noise tube) 12AT7WA Raytheon black plates - triple mica - O getter halo 1960's mis-matched triode sections in white box

7ma Gm=4000

12ma Gm=5300

 

Recommended for

- Eclair Engineering 'Evil Twin' Tube DI (direct input box)
- Atma-sphere preamp
- JC Morrison custom phono
- David Berning Quadrature Z amp