6DR7 GE branded Philco black plates NOS 1969 (2.0ma/38ma)

6DR7 Philco by GE black plates NOS 1969

2ma Gm=1800

38ma Gm=6800

Good Triode = 1.0-1.5ma Gm=1400-1600

Good Pentode = 25-35ma Gm=5500-6000

– Border Patrol