1 low noise tube) CK5687WA Raytheon black plates "O" getter like new 1960 in white box

1 section) 35ma Gm=11,800

1 section) 38ma Gm=12,300 

- Similar sound and build to Tungsol

Recommended for

Manley

Modwright

Audio Note

Ray Samuels

Ayon

Kondo

Mastersound

Audio Thrills

Loth