(!!!!) (BEST PAIR #1) ECC808=6KX8 Telefunken Diamond Bottom NOS 1969 (1.2/1.2ma and 1.3/1.4ma)
(!!!) (BEST PAIR #2) ECC808=6KX8 Telefunken Diamond Bottom NOS 1969 (1.1/1.1ma and 1.1/1.4ma)
ECC808=6KX8 Telefunken Diamond Bottom NOS 1969 (.9/.9ma Gm=1500/1500) 1% section balance
ECC808=6KX8 Telefunken Diamond Bottom NOS faded printing from rubbing inside box 1969 (.8/1.0ma Gm=1400/1500)
ECC808=6KX8 Mullard Made in Germany by VALVO NOS 1969 same date codes 1-2% matched (matched on Amplitrex)
(!) ECC808=6KX8 Telefunken Diamond Bottom NOS 1963 (.8/.9ma Gm=1300/1400)
(!!) (Best Single) ECC808=6KX8 Mullard Made in Germany by VALVO NOS 1969 (2.1/2.2ma)
