Mullard CV4004/12AX7Boxed-plate, made in Great Britain. The most sought after 12AX7 we have. It was sad that we were down to our last box, but Uncle Kevin did the deal and found some that were stocks from the Australian Royal Navy. Dig those Aussies!!! These are bulk packed (meaning, they will come in generic white boxes) and as perfect as it gets. Price is for a single tube.
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.
If you have a preamp or phonostage, you need at least Gold grade.
Box may vary from picture above, as tubes may come in the military box or generic white boxes depending on available stocks. Price includes matching in any quantity you need at no extra charge.