Siemens 7308 - Made in the U.S.A. by Philips ECG and branded Siemens. Unlike most 7308 tubes that usually have a somewhat relaxed top end, this tube has a clean top end that maintains extension without being bright, neutral mids, and wonderful tight bass.
If used in a preamp or phonostage, you may hear a slight "ting!" through your speakers when you move switches, or tap on the unit. This is normal.
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.
Price includes matching in any quantity you need at no extra charge.