(!!) (Best Single) 6EM7 RCA black plates NOS 1969 (2.9ma and 53ma)

6EM7 RCA NOS 1969 (CI)

2.9ma Gm=2300

53ma Gm=7900

Tested on Amplitrex

Good Ma Triode = 1.4ma+ Gm=1500

Good Ma Pentode = 35-40ma 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)