(!!) (Recommended Pair) ECL86=6GW8 Mullard UK branded GE and Sylvania NOS 1970 (1.5/1.2ma and 43.5/40ma)1 pair) ECL86=6GW8 Mullard UK branded GE and Sylvania NOS 1970 1 tube) 1. 5ma Gm=1800 (triode) 43. 5ma Gm=10,500 (pentode) GE faded printing 1 tube) 1. 2ma Gm=1800 (triode) 40. 0ma Gm=10,200 (pentode) Sylvania Tested on Amplitrex NOS mA triode = 1. 0 1. 2ma+ and Gm=1500 1600 NOS mA pentode = 30 35ma+ Gm=9000 10,000 recommended for: Shindo Aurieges L linestage Headamp Aristaeus 2007 Sennheiser Orpheus headphone amp TELEFUNKEN HYMNUS CONSOLE 1962 Revox