(!!) (slightly microphonic) 12AU7A Raytheon black ribbed plates “”D”” getter halo black coated glass 1951 (8.8/9.6ma)

1 slightly microphonic low noise tube) 12AU7A Raytheon black ribbed plates “”D”” getter halo / black coated glass (1-30=1951) in white box

8.8ma Gm=2100

9.6ma Gm=2100

Good Ma range 8-10ma

Good Gm range 1800-2200