The Sovtek 12AX7WA is a defacto standard in 12AX7 tubes for many years yet because of its high dependability and its low noise floor.
The 12AX7EH provides high gain with ultra low noise and detailed, musical tone that rivals the most desirable NOS types.
TT-Selection: Balanced Gain
LPS = Long Plate Spiral Heater
Sounds pretty good in the input section of "modern" Fender amps with more overdrive but is also very popular among the Marshall users.
Russian Version of th EL84
Sweet and warm sounding preamp tube with high gain.
We recommend this tube for guitar/bass amps