Current production tube made by New Sensor in Russia. Great tube. These tubes have been testing really low in noise and microphony, so if you have a preamp that is very sensitive, this may be the way to go.
Platinum grade - The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.
Gold grade - Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.
Driver grade - Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.
This grade is only suitable for use in the driver stage of an amplifier, or the output/buffer stage of a DAC or CD Player.
Logo quality may vary from picture above. Price includes matching in any quantity you need at no extra charge.