1 low noise tube) 5687 Tungsol rebranded IBM bronze plates "U" getter used/very good late 1950's

1 section) 32.5ma Gm=10,200

1 section) 39.0ma Gm=11,700 

Recommended for

Manley

Modwright

Audio Note

Ray Samuels

Ayon

Kondo

Mastersound

Audio Thrills

Loth