(!!!) 6GM8=ECC86 Amperex Holland NOS 1975 faded printing (4.0/4.5ma)

1 low noise tube) 6GM8=ECC86 Amperex Holland NOS 1975 faded printing (tn4 series)

4.0ma Gm=5800

4.5ma Gm=6500

Tested on Amplitrex

- Wavelength Cosecant USB DAC
- Aikido preamp
- Cavalli Audio EHHA (Embedded Hybrid Headphone Amplifier)