Sovtek 12AX7WA Twin Triode

The Sovtek 12AX7WA twin triode (the same as a 7025, ecc83) is one of the most widely used tubes on the market. You will find these preamp tubes used in a range of amplifiers including  Fender, Orange, Carvin, Hartke,  Trace Elliot and many others.

The Sovtek 12ax7is available in three version being 12AX7WA, 12AX7WB, 12AX7WC with each having a slight variance in their sound,

• 12AX7WA 7025 is known across the world for having a smooth yet round tone with low microphonics and is used by amp companies such as  Fender®, Ampeg, Carvin, and Hartke, among others.
• 12AX7WB 7025 has more gain and saturation than 12AX7WA. A slightly warmer yet darker and is preferred by Rivera, VHT, Demeter, and Kendrick, among other manufacturers.
• 12AX7WC 7025 has even more gain than the WB

So, in short, the WA is the base 12ax7 and the WB and WC increase in gain on each other.