Old stock. The tubes are new and never used
"Reflektor" factory
Same Date from 1980's (from same batch)
Tested and Measured Quad 6P3S (6П3С) Tetrode
We test our tubes from this type on High-End Military Tube Tester: L3-3
Measured parameters attached to each tube, difference < 3%
on the photo shows an example of tubes with parameters,
if you need actual date codes and parameters - please ask
Lot of 4 (Matched & Balanced Quartet)
The Same Tubes with shipping from the USA: