- Official Electro Harmonix valve.
- 12DW7 design.
- For use in preamp.
- Dual triode.
- Made in Russia.
This tube is used in certain amplifiers (we know it's used in an ampeg one, but is used in others too). It's essentially a combination of the 12AX7 and a 12AU7 tube. This usually means there's a gain reduction over a standard 12AX7. If you order x3 or more then a 5% discount is auto applied.