12AX7

The 12AX7 is a type of vacuum tube (or electron tube) that is commonly used in audio amplification and signal processing applications, particularly in guitar amplifiers, hi-fi audio equipment, and as a preamplifier in various electronic devices. Here are some key points about the 12AX7: 1. **Type**: It is a dual triode, meaning it contains two independent triodes in a single glass envelope.