(!!!) (BEST VALUE PAIR) 5881 Tungsol tests like new 1957 and 1963 with broken center guide pins - see photo (72.5ma and 68.2ma)1 Pair) 5881 Tungsol test like new 1957 and 1963 with broken center guide pins see photo 1 tube) 72. 5mA and Gm=5600 1 tube) 68. 2mA and Gm=5550 Tested on Amplitrex Good used Ma range 55 70ma Good used 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