ECC808=6KX8 Mullard Made in Germany by VALVO NOS 1969 same date codes 1-2% matched (matched on Amplitrex)

1 matched pair) ECC808=6KX8 Mullard Made in Germany by VALVO NOS ribbed plates 1969 

1 tube) 1.2/1.3ma Gm=1600/1800

1 tube) 1.3/1.3ma Gm=1600/1700

Matched on Amplitrex

Vplate=250V

Vgrid=-1.9V

Good Ma = 1.2ma

Good Gm = 1600

(5 are used in the 4 Channel Echolette PA amp made in Germany)