Balanced Sovtek 12AX7LPS Preamp Tube
The Balanced Sovtek 12AX7LPS Preamp Tube is an entirely new 12AX7 design from Sovtek and a great step up in sound quality. They have very large ribbed plates and great sound reproduction. They are very smooth and well balanced in terms of bass, mids and treble response. The large plates make them more prone to microphonics and in combo amps, so they can be a problem if you like to run things wide open. It is still the best thing Sovtek has produced in a 12AX7, with very good gain and low noise.
When should I use a Balanced Sovtek 12AX7LPS Preamp Tube?
It is advised against using them in compact high-powered combo amps where they will be subjected to lots of vibration. One other note about the construction of these tubes is they have filaments that are almost completely encased in the plate structure. They often don’t “light up” when working properly.
This is not a problem, it’s normal for the LPS
For more technical information on the 12AX7 vacuum tube, read here.