(!!) (Best Pair) ECC40 Philips NOS made by La Radiotechnique, Chartres/France 1969 (6.0/6.1ma and 6.0/6.1ma) 1-2% matched

1 pair) ECC40 Philips NOS made by La Radiotechnique, Chartres/France 1969

1 tube) 6.0/6.1ma Gm=2800/2900

1 tube) 6.0/6.1ma Gm=2700/2800

Vplate=250V

Vgrid=-5.6V

Good Ma = 5.5-6ma

Good Gm = 2600-2900

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