Vox Ac 30 Circuit Modifications

By | September 25, 2023

Vox AC 30 Circuit Modifications

The Vox AC 30 is a classic British amplifier that has been used by countless guitarists over the years. It's known for its warm, overdriven tone, which has made it a favorite for blues, rock, and metal players alike. While the AC 30 is a great amplifier out of the box, there are a number of modifications that can be made to improve its sound or performance. Some of these modifications are relatively simple and can be done by a home hobbyist, while others require more advanced skills and equipment. In this article, we'll take a look at some of the most common Vox AC 30 circuit modifications. We'll discuss what each modification does, how to do it, and what the results are.

1. Changing the Output Transformers

The output transformers in a guitar amplifier are responsible for converting the amplifier's signal from a high-impedance to a low-impedance signal. This allows the amplifier to drive a speaker cabinet. The stock output transformers in the AC 30 are designed to work with a 16-ohm speaker cabinet. However, you can also use a 4-ohm or 8-ohm speaker cabinet with the AC 30. To do this, you'll need to change the output transformers. Changing the output transformers is a relatively simple modification that can be done by a home hobbyist. However, it's important to note that you'll need to have some basic soldering skills. To change the output transformers, you'll need to remove the old transformers from the amplifier. Once the old transformers are removed, you can install the new transformers. Be sure to connect the new transformers to the amplifier's circuit board correctly. Changing the output transformers can have a significant impact on the AC 30's sound. Using a 4-ohm speaker cabinet will make the AC 30 sound louder and more aggressive. Using an 8-ohm speaker cabinet will make the AC 30 sound smoother and more refined.

2. Changing the Power Tubes

The power tubes in a guitar amplifier are responsible for generating the amplifier's power. The stock power tubes in the AC 30 are EL84s. However, you can also use other power tubes, such as 6V6s or KT66s. Changing the power tubes is a relatively simple modification that can be done by a home hobbyist. However, it's important to note that you'll need to have some basic soldering skills. To change the power tubes, you'll need to remove the old tubes from the amplifier. Once the old tubes are removed, you can install the new tubes. Be sure to connect the new tubes to the amplifier's circuit board correctly. Changing the power tubes can have a significant impact on the AC 30's sound. Using different power tubes can change the amplifier's gain, output, and tone.

3. Changing the Preamp Tubes

The preamp tubes in a guitar amplifier are responsible for shaping the amplifier's tone. The stock preamp tubes in the AC 30 are ECC83s. However, you can also use other preamp tubes, such as 12AX7s or 12AT7s. Changing the preamp tubes is a relatively simple modification that can be done by a home hobbyist. However, it's important to note that you'll need to have some basic soldering skills. To change the preamp tubes, you'll need to remove the old tubes from the amplifier. Once the old tubes are removed, you can install the new tubes. Be sure to connect the new tubes to the amplifier's circuit board correctly. Changing the preamp tubes can have a significant impact on the AC 30's sound. Using different preamp tubes can change the amplifier's gain, EQ, and overall tone.

4. Adding a Tone Stack Mod

The tone stack in a guitar amplifier is responsible for shaping the amplifier's tone. The stock tone stack in the AC 30 is a simple Baxandall tone stack. However, you can also add a more complex tone stack to the amplifier. Adding a tone stack mod is a relatively complex modification that should be done by a qualified technician. However, there are a number of kits available that make it possible for a home hobbyist to do the modification. Adding a tone stack mod can give you more control over the AC 30's tone. You can use the tone stack to add more bass, treble, or mids to the amplifier's sound.

5. Adding a Master Volume

The AC 30 does not have a master volume control. This means that the amplifier's


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