(!!) ECC31=CV1285=6N7G Mullard black plates NOS 1950's (7.4/9.4ma)
By Tube World
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)
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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:
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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 realistic space, rhythm, great tonal balance with very truthful sound of the instruments, natural colours...this tube gives POWER and authority to the 45 flew power triode! Stunning! Going back to the Ken-Rad's are several steps backwards: Air is lost, less colours, less strong, narrow, the music doesn't make so much fun anymore than before, the musicians seem to play funny uninspirated. The ECC31=CV1285 may be a little
underestimated due to the common cathode, but this is a big mistake. Running in parallel is not "political correct", but it sounds absolutely outstanding!
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 ECC31=CV1285=6N7G Mullard black plates NOS 1950's (7.4/9.4ma) "Pin It")