(!!!) (Best Pair) 5881 Tungsol rebranded Sylvania and GE 1960 era used/test like new (77.3ma and 74.5ma) (close Gm)

1 pair) 5881 Tungsol rebranded Sylvania and GE 1960 era used/test like new in white boxes

1 tube) 77.3ma Gm=6000

1 tube) 74.5ma Gm=5900 branded GE slightly taller bottle

Tested on Amplitrex

Good Ma range 55-70ma

Good Gm = 4500-6000
 

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