(!!) ECC31=CV1285=6N7G Mullard black plates NOS 1950's (7.4/9.4ma)

1 tube) ECC31=6N7G Mullard NOS 1950's black plates black base in white box  mis-matched triode sections 7.4ma Gm=2600 9.4ma Gm=3100   Vplate=200V, Vgrid=-2V, Good Iplate range 6-9ma   ECC31=CV1285 Mullard: (6N7GT substitute)----------------------------------------------------------The ECC31 uses a common cathode for both triode sections and is equivalent to a 6N7G. Except for interelectrode capacitances, and a different pinout, this tube is identical electrically with type ECC32, but CANNOT be substituted for a ECC32 (ECC31 mu = 32, ECC32 mu=32) ECC31 SONIC FEEDBACK:--------------------One might think you would praise the Mullard ECC31 to justify the high price you ask. But that's not true, they sound so extremely good the price IS justified (because you cannot get this sound cheaper): My just for fun stereo amp is a Philco type 45 driven by Ken-Rad 6N7GT's. I was very pleased with the sound, so I wanted to know how the praised Mullard ECC31/CV1285 may sound....unbelievable! Lots of re