(!!) 13EM7 RCA black base black plates NOS 1968 (2.0ma/28ma)

13EM7 RCA black base black plates NOS 1968

2.0ma Gm=1600

28ma Gm=5100

Tested on Amplitrex

Good Ma triode #1 = 1.2-1.4ma

Good Gm triode #1 =1400-1600

Good Ma triode #2 = 30-40ma

Good Gm triode #2 = 5500-7000

– Modwright