(!!) (Best Pair #3) JAN-6528A Cetron USA NOS and like new 1989 (100/135mA and 100/128mA)

1 pair) JAN-6528A Cetron NOS and like new in Cetron box

1 tube) 100/135ma Gm=24,200/26,800 NOS on right

1 tube) 100/128ma Gm=23,800/26,200 like new – taller bottle – on left

Vplate=140

Vgriod=-10

NOS mA = 100-120mA

NOS Gm range 24,000-30,000

graphite plates