(!!!) (Best Raytheon Pair #3) CK-5687WB Raytheon black plates NOS 1970's (Audio Note, Manley, Modwright) (35/37ma and 35.5/38ma) 1-3% matched (Highest Gm) (Manley, Modwright, Audio Note)1 low noise pair) CK 5687WB Raytheon black plates NOS 1970's (Highest Gm) 1 tube) 35 37ma Gm=12,000 12,600 1 tube) 35. 5 38ma Gm=12,300 13,000 Matched on Amplitrex Good NOS Ma range 30 35ma 7119 and 6900 is best sub for a 5687 and visa versa RECOMMENDED FOR: Modwright preamp Audio Note DAC 4 Audio Note Jinro amp Audio Note L3 Audio Note M3 preamp Manley Ray Samuels Raptor and B52 Aria VW5XL Modwright Sony DVP999ES Audion 845 Black Shadow Bottlehed