6EM7 RCA coin-base NOS 1971 (3.2ma/55ma)

6EM7 RCA coin-base NOS 1971 (DH)

3.2ma Gm=2200

55ma Gm=7050

Tested on Amplitrex

Good Ma Triode 1: 1.5ma and Gm=1500

Good Ma Triode 2: 30-40ma and Gm=6000-7000

for:

Joule Electra LA-100 MK3
Modwright power supply
Wright Sound phono wpp-200c
Wright Sound WLA12A preamp
Kenji Mizushima Kenso
Music Reference 6EM7 amp
Welbourne Apollo mono amps (KR/VAIC VV52B or 300B output tubes)