Tubes tested with L1-3 tester - all comply with the parameters specified in the technical passport.
There may be different manufacturers and dates - but they must be new(in a specific pair).

6N1P tubes are direct replacement for the chinese 6N1 and they also do offer a better performance.

It may be also used as a replacement for the E88CC/6922/6DJ8 tubes, but you have to be careful here,
because there are some important differences. The 6N1P's are drawing considerably more heater current:
about 600 mA, comparing to the E88CC/6922/6DJ8 tubes, where it is about 365 mA. In some cases a direct
replacement without any discussion with the manufacturer, may end up in damaging of your equipment.

All of the tubes were fully tested with the L3-1 tube tester & matched in pairs - we are continuously working on testing new tubes from a big lot made in the same year (1986) to find the tubes with the closest characteristics.

Anode/plate current range of a new tube: (6-7,5-9 mA). Transconductance range of a new tube (4-4,5-5,4 mA/V).
Not less than 3000 operating hours.Items will be safely packed and shipped via Lithuania post - registered mail.