The Electro-Harmonix 6N1 is used as the driver tube by Audio Research in their VS55 and VS110 amps. They are similar to the 6DJ8 except that the 6N1 has a higher heater current. May be a suitable replacement for 6DJ8 / 6922 variants – Please check with the manufacturer before doing so.
1 X Electro-Harmonix 6N1(6H1) Tube
Made in Russia