6N1P-VI = ECC88 = 6DJ8 tube. Double triode in box
6N1P-VI is a long life miniature 9-pin medium gain dual triode vacuum tube used as a line audio amplifier and cathode driver.
Except for higher heater current, it's a direct plug-in replecement for the 6DJ8, ECC88 and 6922.
6N1P-VI feature very low distortion, medium transconductace, higher plate voltage and dissipation rating than 6DJ8. Internaly shielded between sections, 6N1P-VI can be perfectly used at differing signal levels. A larger cathode than 6DJ8 types gives 6N1P-VI longer life and more transient current capability.