1 low noise tube) 5687 Raytheon part bronze part black plates used/tests like new 1960 era in white box – faded printing

33ma Gm=11,000

38ma Gm=11,800

Good Ma range 30-35ma

Recommended for

Manley

Modwright

Audio Note

Ray Samuels

Ayon

Kondo

Mastersound

Audio Thrills

Loth