NOTICE: Be sure to enter the Make & Model of component you are purchasing tubes for. Failure to do so will delay processing of your order. We do not ship tubes without this information.
CEI ECC82 – CEI stands for Calvert Electronics Inc. They usually sold tubes made by Mullard. Careful inspection shows that these are Mullard internals…just like the old logo Mullard we sell. The codes etched in the glass show they were made in the Mullard-related factory in India. Which is a really good thing. They have that famous Mullard midrange texture that cannot be denied.
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/Buffer 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.
If you have a preamp or phonostage, you need at least Gold grade.