(!!!!) (Best Value Pair) 5881 Tungsol and Tungsol branded RCA NOS 1957-1959 (63ma and 63ma) 5881 Tungsol 1950”s pair: 5881 Tungsol

1 matched pair) 5881 Tungsol 1957 NOS and Tungsol branded RCA 1959 NOS slightly tilted glass – in white boxes – best in breed

1 tube) 63ma Gm=5400

1 tube) 63ma Gm=5500

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