(!!!!) (Best Pair #1) 5881 Tungsol NOS 1954 original boxes (72 and 73ma) (rare)

1 matched pair) 5881 Tungsol NOS 1954 original boxes (best of breed) 1 tube) 73ma Gm=6250 slightly darker base 1 tube) 72ma Gm=6200   Tested on Amplitrex Good used mA range 55-65ma Good used Gm = 4500-5500  recommended for: - Pro Dawg (copy of 5E5A Circuit)- Naylor SD60- Fender Bassman RI 1956, 1959- Fender Pro-Amp 1962- Victoria Regal 2007- Melody SP3 amp- Heath W4AM mono amps- Audio Note SORO linestage- Mesa Boogie Mark 4- Supratek- CARR Rambler- Line6 Spider Valve 112 (2007) Reinhold Bogner Amplification UK- Clark Tyger 2011- Clark Piedmont 2003