1 low noise pair) JTL-5687 and 5687 Tungsol black plates "U" getter NOS 1950's same build - good printing

1 tube) 33.0/36.5ma Gm=10,200/11,200 (1954)

1 tube) 34.4/33.6ma Gm=11,200/11,100 (1950's)

Recommended for

Manley

Modwright

Audio Note

Ray Samuels

Ayon

Kondo

Mastersound

Audio Thrills

Loth