1 low noise tube) CK-5687 Raytheon black plates "O" getter like new 1960 in white box

1 section) 30ma Gm=10,600

1 section) 33.5ma Gm=11,500 

- Similar sound and build to Tungsol

Recommended for

Manley

Modwright

Audio Note

Ray Samuels

Ayon

Kondo

Mastersound

Audio Thrills

Loth