(!!!) (Best Overall Single) 6528A Cetron NOS 1980 (132/139mA)

1 tube) JAN-6528A Cetron NOS 1980 in white box

1 section) 132ma Gm=24,100

1 section) 139ma Gm=23,400

Vplate=140

Vgriod=-10

NOS mA = 110-120mA

NOS Gm range 25,000-30,000

graphite plates