(!!!!) (Best RCA Single) 5687 RCA black plates NOS 1963 (39.2/41ma)

1 low noise tube) 5687 RCA black plates NOS 1963

1 section) 39.2ma Gm=11,100

1 section) 41.0ma Gm=11,200

Good NOS Ma range 30-35ma

Recommended for

Manley

Modwright

Audio Note

Ray Samuels

Ayon

Kondo

Mastersound

Audio Thrills

Loth