ここから本文です
真空管とは

A vacuum tube is a glass tube that has a vacuum state inside, which controls and amplifies current and audio signals. It was invented in the early 1900s and was widely used in radios and audio equipment until the 1960s, but it is currently only used in very few audio amplifiers, recording equipment, and guitar / bass amplifiers. However, even today, many guitarists feel the distortion and rich harmonics of tube amps are very comfortable and easy to play. Many guitar amps, amp simulators, and digital effectors on the market today are also able to reproduce the sound and feel of tube amps, and for guitarists it is still very familiar today.

About replacing vacuum tubes

The sound output by replacing tubes of other brands will create different sound characteristics. Also, depending on the combination, it will reveal various different expressions. It can be said that it is a very tasteful and profound world.

Moreover, there is no such thing as a clear replacement time due to deterioration, and there is also a big difference depending on the frequency of use of the amplifier. It may be time to replace the tube if the sound has become unhealthy or has become more distorted than before. However, if the amplifier is not working properly, the tube may not always be the cause. If you think that your amp is out of order, we recommend that you inquire with an instrument store, amp repair shop, etc., to have the amp inspected and repaired, if necessary.

Tube type

Pre-tube

It plays the role of amplifying the weak signal from the guitar before it is amplified. It is a vacuum tube that makes the basic tone of the amplifier, such as the hardness, brightness, and distortion of the sound. Depending on the amp, you can change the sound character quite simply by replacing the pre-tube. Since there are so many options for the 12AX7 / ECC83, why not try various products? 12AU7 and 12AT7 are vacuum tubes used for operation of phase inversion and reverb unit.

  • 12AX7

    12AX7
    Compatible vacuum tube
    12AX7A12AX7WA12AX7WB7025575112AX7WCECC83E83CC

  • ECC83

    ECC83
    Compatible vacuum tube
    12AX7A12AX7WA12AX7WB7025575112AX7WCECC83E83CC

  • 12AT7

    12AT7
    Compatible vacuum tube
    ECC81A2900B152CC81E6057

  • 12AU7

    12AU7
    Compatible vacuum tube
    ECC82E82CCB329

Power tube

A vacuum tube that amplifies the audio signal created by the pre-tube into the large output signal from the speaker. American manufacturers such as FENDER and MESA BOOGIE often use 6L6 series, and European manufacturers such as MARSHALL and HIWATT use EL34 series power tubes, and the difference in the vacuum tubes plays a major role in the sound character of the amps. Most tube amplifiers operate on either two or four tubes.

  • EL84

    EL84
    Compatible vacuum tube
    6BQ56P15N709CV8069CV2975

  • EL34

    ECC83
    Compatible vacuum tube
    KT776C7ACV741CV1741

  • 6550

    12AT7
    Compatible vacuum tube
    CV5220KT88

  • 6L6GC

    12AU7
    Compatible vacuum tube
    6L66L6WGCKT66CV1947DL37EL375781AN665881

  • 6V6GTA

    12AX7
    Compatible vacuum tube
    5871CV511CV509CV731

Rectifier tube

It creates a DC voltage for operating the vacuum tube. In modern times, even products that claim to be all-tube amplifiers have had their tubes replaced by diodes, and many models are not installed with any tubes at all. The VOX AC30 and the MESA BOOGIE Rectifier series are well-known amplifiers equipped with rectifier tubes.

Important point

  • Replace the vacuum tube at your own risk. There is also the possibility of an electric shock, etc., and this is a dangerous operation. Please be careful.
  • When replacing the power tube, it may be necessary to adjust the amplifier (bias adjustment). For replacement including bias adjustment, ask your dealer, amplifier repair shop, etc.

Categories

Search by Brand

Brand List
Special Coupon Information
OTOYA Magazine
how to
＞ see more
FACEBOOK LINE YouTube X Instagram TikTok
Catalog request
User Guide
Recruitment
Recruiting Music Writers