7025 Tubes vs. 12ax7 Tubes

There are many amplifier tubes out there, including the popular 12AX7 and the 7025. So what are they? And how do they compare to each other?

If you’re looking for answers to these questions, you’re in the right place. Today, I’ll put the 7025 tube vs. the 12AX7 counterpart, so you can have a better idea about both of them!

What Are Amplifier Tubes?

When you’re playing the guitar, the amplifier’s tubes are responsible for producing the sound you hear. They achieve that by elevating the little signals coming off the pickups from your guitar. 

After that, they take these tiny signals and amplify them into something large enough to move air. This power is able to drive speakers to produce sound waves. 

All amplifiers have similar components. When you look at the back of any amplifier, you’ll find a set of glass tubes that look like light bulbs with a pointed protrusion on the top.

Each one of these tubes serves a different purpose. The tubes we’re comparing here belong to the preamp tubes, so let’s explain that.

The goal of the preamp tubes is to condition the properties of the incoming signals from the guitar. It does that by elevating the incoming signals up to a nominal level. Once the signals are large enough, the other tubes can work on them.

Over the years, guitarists discovered that when you push these tubes hard, the signals start to distort. Most tube amplifiers in the market use at least one 12ax7 preamp tube. However, this number can jump up to 5 tubes in some complex set-ups.

This is also known as the “cascading gain stages”. It happens when you can achieve the effect of more than one preamp tube within the same amplifier. This can make a more pleasant and richer distortion 

12AX7 Preamp Tube