The tubes are new and never used. Same Date. Careful packing.

The 6H6P double triode is designed for low frequency power amplification.
The miniature devices enclosed in glass bulb and provided with a nine- pin base and an indirectly heated oxide-coated cathode.
The 6H6P double triodes are resistant to ambient temperature from — 60 to 4-70° C and relative humidity of 95 to 98% at +40° C, as well as to mechanical loads: linear loads up to 100 g, vibration loads up to 2.5 g, and single impact loads up to 500 g and multiple impact loads up to 12 g.

Datasheets: https://www.thetubestore.com/lib/thetubestore/RU-6N6P.pdf