How To Identify Different Types of Vacuum Tubes – An Infographic Reference Guide

Pairing a great tube with a great amplifier is the key recipe in anyone’s audio tone. Do different tubes really make much of a difference in your sound?  How can you identify what tubes go with which amp, with all the different types of vacuum tubes out there?  What’s the difference between an EL34 and a 6L6?  We’ve put together this reference guide to introduce you to some of the basic differences between some of the classic tubes and their classic sounds.

 

Different Types of Vacuum Tubes

6DJ8

Designed for TV tuners and industrial equipment, the 6DJ8 instead became popular in hi-fi amplifiers and are now relatively hard to come by.  They are low noise, low volume and better for low gain buffer applications.

5751

The 5751 is a great tube for shaping your tone, giving you a higher level of control over the warmth of your high end and clarity of your midrange.  For more gain, switch to a 12AX7.

12AX7

12AX7 tubes are very common in guitar tube amps from Fender and Vox among others (I like the Monoprice tube amp myself).  The cleans have more clarity and gain, and overdrive modes have more crunch. Swap your tubes out for these for tone transformation.

6SL7

With dual hi-mu triodes, the 6SL7 is a good alternative to the 12AX7.  This tube has very clean gain with a sharp single note definition not found elsewhere.

KT88

High power and low distortion make the KT88 more popular with hi-fi amps than guitar amps.  They are regularly used to replace 6550 tubes when seeking a cleaner tone. It’s also one of the largest tubes in its class and capable of handling higher voltages.

6L6

You know this tube whether you knew it or not.  The 6L6 is THE sound of rock and roll – the Fender amp sound, with a low to medium gain clip great for rhythm.  The 6L6 has also found widespread popularity in many other applications as well.

6v6

The 6V6 is the sound of the Fender Tweed amp, with a reduced low end compared to the 6L6.  It also has the longest active production lifetime of any other electronic component, having been in continuous production for over 80 years!

2A3

The 2A3 has a wide dynamic range like the 6550, but with a lower power and lower volume, and also an impressible low noise floor, making it better for use in preamps.

EL34

The EL34 is the classic sound of the British Invasion, finding common use in Marshall amps, Orange amps, and many others.  Their memorable sound is characterized by greater distortion at lower power than other octal tubes.

EL84

Upon release, the EL84 were a better priced alternative to the EL34 or 6L6 tubes.  The creamy overdrive and great volume of the EL84 can you from a blues twang to a rock edge.

KT66

This tube has great crunch when overdriven, but more bite than the similar ET34.  The KT in KT66 stands for “kinkless tetrode”, a performance improvement over other tubes available at the time.

6550

One of the most commonly used tubes, the 6550 is versatile in both guitar and stereo amps and is known for its signature wide dynamics & full bodies tone.

If you’re a musician looking to dial in your perfect tone, check out our list of the best 5-watt tube amps!

 

Nobsound NS-10P Mini Vacuum Tube Preamp Audio Hi-Fi Stereo Pre-Amplifier Treble & Bass Control
AIYIMA T10 JAN5654 Tube Vacuum Preamplifier Audio Decoder Bluetooth 5.0 HiFi Headphone Amp with PC-USB APTX Coaxial Optical Input & OLED Display for Home Audio Amplifier (T2)
Bravo Audio Ocean Mini Valve Class A Tube Headphone Amplifier
SUCA AUDIO Tube Preamplifier for Home Audio Player Mini Hi-Fi Stereo Preamp with Treble & Bass Control (6K4 Tubes)
Nobsound NS-08E Vacuum Tube Headphone Amplifier Hi-Fi Valve Headphone Amp Stereo Audio Preamplifier
Nobsound NS-10P Mini Vacuum Tube Preamp Audio Hi-Fi Stereo Pre-Amplifier Treble & Bass Control
AIYIMA T10 JAN5654 Tube Vacuum Preamplifier Audio Decoder Bluetooth 5.0 HiFi Headphone Amp with PC-USB APTX Coaxial Optical Input & OLED Display for Home Audio Amplifier (T2)
Bravo Audio Ocean Mini Valve Class A Tube Headphone Amplifier
SUCA AUDIO Tube Preamplifier for Home Audio Player Mini Hi-Fi Stereo Preamp with Treble & Bass Control (6K4 Tubes)
Nobsound NS-08E Vacuum Tube Headphone Amplifier Hi-Fi Valve Headphone Amp Stereo Audio Preamplifier
Nobsound NS-10P Mini Vacuum Tube Preamp Audio Hi-Fi Stereo Pre-Amplifier Treble & Bass Control
Nobsound NS-10P Mini Vacuum Tube Preamp Audio Hi-Fi Stereo Pre-Amplifier Treble & Bass Control
AIYIMA T10 JAN5654 Tube Vacuum Preamplifier Audio Decoder Bluetooth 5.0 HiFi Headphone Amp with PC-USB APTX Coaxial Optical Input & OLED Display for Home Audio Amplifier (T2)
AIYIMA T10 JAN5654 Tube Vacuum Preamplifier Audio Decoder Bluetooth 5.0 HiFi Headphone Amp with PC-USB APTX Coaxial Optical Input & OLED Display for Home Audio Amplifier (T2)
Bravo Audio Ocean Mini Valve Class A Tube Headphone Amplifier
Bravo Audio Ocean Mini Valve Class A Tube Headphone Amplifier
SUCA AUDIO Tube Preamplifier for Home Audio Player Mini Hi-Fi Stereo Preamp with Treble & Bass Control (6K4 Tubes)
SUCA AUDIO Tube Preamplifier for Home Audio Player Mini Hi-Fi Stereo Preamp with Treble & Bass Control (6K4 Tubes)
Nobsound NS-08E Vacuum Tube Headphone Amplifier Hi-Fi Valve Headphone Amp Stereo Audio Preamplifier
Nobsound NS-08E Vacuum Tube Headphone Amplifier Hi-Fi Valve Headphone Amp Stereo Audio Preamplifier
Douk Audio P1 Vacuum Tube Bluetooth Preamplifier, GE5654 Audio Preamp, Hi-Fi Headphone Amp, Stereo Wireless Receiver with USB DAC & APTX-HD for Home Theater Amplifier/Active Speaker
Fosi Audio T20 Bluetooth 5.0 Tube Amplifier Headphone Amp Support aptX HD Stereo Receiver 2 Channel Class D Digital Mini Hi-Fi Power Amp for Home Passive Speakers with 6A2 Vacuum Tubes
Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version
Fosi Audio P2 Headphone Amplifier Vacuum Tube Headphone Amp Mini Hi-Fi Stereo Audio with Low Ground Noise Output Protection
AIYIMA Bluetooth Tube Amplifier Headphone Amplifiers,TPA3116D2 HiFi Stereo 6J4 Vacuum Tube Preamp Amplifier 50W+50W for Home Audio Speaker System + DC Power Supply
Douk Audio P1 Vacuum Tube Bluetooth Preamplifier, GE5654 Audio Preamp, Hi-Fi Headphone Amp, Stereo Wireless Receiver with USB DAC & APTX-HD for Home Theater Amplifier/Active Speaker
Fosi Audio T20 Bluetooth 5.0 Tube Amplifier Headphone Amp Support aptX HD Stereo Receiver 2 Channel Class D Digital Mini Hi-Fi Power Amp for Home Passive Speakers with 6A2 Vacuum Tubes
Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version
Fosi Audio P2 Headphone Amplifier Vacuum Tube Headphone Amp Mini Hi-Fi Stereo Audio with Low Ground Noise Output Protection
AIYIMA Bluetooth Tube Amplifier Headphone Amplifiers,TPA3116D2 HiFi Stereo 6J4 Vacuum Tube Preamp Amplifier 50W+50W for Home Audio Speaker System + DC Power Supply
Douk Audio P1 Vacuum Tube Bluetooth Preamplifier, GE5654 Audio Preamp, Hi-Fi Headphone Amp, Stereo Wireless Receiver with USB DAC & APTX-HD for Home Theater Amplifier/Active Speaker
Douk Audio P1 Vacuum Tube Bluetooth Preamplifier, GE5654 Audio Preamp, Hi-Fi Headphone Amp, Stereo Wireless Receiver with USB DAC & APTX-HD for Home Theater Amplifier/Active Speaker
Fosi Audio T20 Bluetooth 5.0 Tube Amplifier Headphone Amp Support aptX HD Stereo Receiver 2 Channel Class D Digital Mini Hi-Fi Power Amp for Home Passive Speakers with 6A2 Vacuum Tubes
Fosi Audio T20 Bluetooth 5.0 Tube Amplifier Headphone Amp Support aptX HD Stereo Receiver 2 Channel Class D Digital Mini Hi-Fi Power Amp for Home Passive Speakers with 6A2 Vacuum Tubes
Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version
Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version
Fosi Audio P2 Headphone Amplifier Vacuum Tube Headphone Amp Mini Hi-Fi Stereo Audio with Low Ground Noise Output Protection
Fosi Audio P2 Headphone Amplifier Vacuum Tube Headphone Amp Mini Hi-Fi Stereo Audio with Low Ground Noise Output Protection
AIYIMA Bluetooth Tube Amplifier Headphone Amplifiers,TPA3116D2 HiFi Stereo 6J4 Vacuum Tube Preamp Amplifier 50W+50W for Home Audio Speaker System + DC Power Supply
AIYIMA Bluetooth Tube Amplifier Headphone Amplifiers,TPA3116D2 HiFi Stereo 6J4 Vacuum Tube Preamp Amplifier 50W+50W for Home Audio Speaker System + DC Power Supply

 

3 thoughts on “How To Identify Different Types of Vacuum Tubes – An Infographic Reference Guide”

  1. Would it be okay to save that diagram of all the different tubes for my own personal reference? I am not going to use the picture online but I may link make to it in some videos down the road on YouTube. This is really good information. I thought I knew a fair amount about different styles of tubes but I was only scratching the surface!

  2. Hi Josh, who makes that pretty amp at the top of the piece about different types of tubes? Looks like copper… thanks.

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