(!!!!) (Best Pair #2) 6EM7=6EA7 Sylvania coin-base NOS 1970”s (1.5ma/73ma and 1.8ma/65ma)

1 pair) 6EM7=6EA7 Sylvania coin-base NOS 1970”s same build

1 tube) 1.5ma Gm=1500 (triode) 73ma Gm=8800 (pentode) Sylvania

1 tube) 1.8ma Gm=1800 (triode) 65ma Gm=8900 (pentode) Sylvania/Zenith

Tested on Amplitrex

Good Ma Triode = 1.4ma Gm=1500

Good Ma Pentode = 35-40ma Gm=6500

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)