(!) (Single) 6550 Tungsol black plate used/good 1950”s (115ma)

6550 Tungsol black plate used/good 1950”s (2 side getters and 1 top getter) – 1 side getter is faded

115ma

Gm=9050

Tested on Amplitrex AT1000

Good used mA range = 110-130mA

Good used Gm=9,000-10,000