FAQ
- Are all of the amps hand-wired?
- Are PCBs (printed circuit boards) used in the amps?
- Can I customize an amp's logo or name?
- Can I customize an amp's tolex?
- What type of speakers are available?
- Can I choose custom speakers for an amp or cabinet?
- Can I request any add-ons or special modifications to the amp that I want to purchase?
- Can you build me a complete custom amp from scratch?
- What's your current build time?
- What transformers are used in the amps?
- What brand of tubes are used in the amps?
- Are there any class A amp models?
- What does fixed-biased and cathode-biased mean?
- What is negative feedback?
- What is the difference between a tube rectifier and a solid-state rectifier?
- What type of components are used in the amps?
- What type of wood is used in the cabinets?
- Will a SonicTone footswitch work with other brand amplifiers with similar connectors?
- Do you service other brand name amplifiers?
- Do you ship amplifiers outside of the US?
[ ^Top ]1. Are all of the amps hand-wired?
Yes, all of the amps are hand-wired using custom-built turret boards. This tends to be a common method of building hand-wired amps and one of the most reliable and easiest to work on.
[ ^Top ]2. Are PCBs (printed circuit boards) used in the amps?
None of the major sections or components of the amps' circuits are built using printed circuit boards. However, depending on the circuit, PCBs may be used for a few small support components, such as FX loops, switching boards and the low voltage power supplies that may drive these small support components. Those PCBs are designed by SonicTone, manufactured in the US and assembled by hand here at SonicTone. Without getting into the hand-wired vs PCB debate, we believe using PCBs for these small components is appropriate, while adhering to hand-wired turret board construction for the main sections of the amp build.
[ ^Top ]3. Can I customize an amp's logo or name?
No, you cannot customize an amp's logo or name. A lot of work went into the design of the different SonicTone amp models to establish the SonicTone brand. We want to make sure they are recognizable as SonicTone amps.
[ ^Top ]4. Can I customize an amp's tolex?
If the custom tolex request is a line of tolex carried in stock, we can consider the request. Contact us for more information about a possible custom tolex request before placing an order.
[ ^Top ]5. What type of speakers are available?
We offer premium Celestion speakers. We provide a limited selection of popular Celestion speakers with both ceramic and alnico magnets.
[ ^Top ]6. Can I choose custom speakers for an amp or cabinet?
Yes and no. The stock combo amps are matched with certain speakers to ensure that they sound the best they can. In some cases, there may be an option to upgrade the combo speaker selection to a premium speaker selection for an additional cost. For speaker extension cabinets, there is a range of speaker options that can be selected for our 4x12, 2x12 and 1x12 cabinets at the point of purchase. Of course, different speaker selections will vary the price.
[ ^Top ]7. Can I request any add-ons or special modifications to the amp that I want to purchase?
Not at this time. While it is possible, it is a logistical challenge to field requests for custom add-ons and mods which could easily spiral out of control and impact production timelines for all customers. So, the models are only available as they are shown on the website with the features listed.
[ ^Top ]8. Can you build me a complete custom amp from scratch?
Not at this time. While it is possible to build more "a la carte" custom amps for customers, it's much more of a logistical challenge that would impact production timelines for all customers. Only the models listed on the website are what is currently available.
[ ^Top ]9. What's your current build time?
Current build time on most builds is 5-6 weeks, but it subject to change based on the current production schedule and availability of parts.
[ ^Top ]10. What transformers are used in the amps?
Transformers are really the heart of any tube amplifier and they are critical to the sound and the reliability of an amp. We use only high-quality, U.S.-made, custom-wound transformers, designed to our specifications.
[ ^Top ]11. What brand of tubes are used in the amps?
In today's global climate, the availability of tubes has had some challenges, but the tube amp industry has persevered. Taking that into account, we attempt to source the best tubes that are available at the best prices.
We provide a two options for the selection of an amp's tube set:
Basic Stock: This option is included in the base price. These are typically affordable, well-performing tubes like J/J tubes. The amps will perform well and sound very good with a basic stock set of tubes.
Preferred Stock: This option is an upgrade from the basic stock tube set. This will typically include more robust brands like Electro-Harmonix or Sovtek
[ ^Top ]12. Are there any class A amp models?
Yes, there are two SonicTone models in the SE Series that are pure, single-ended class A amps. However, there is a significant amount of marketing hype and misinformation out there pertaining to "class A" tube amplifiers. To learn more about the class A topology, visit the Class A Amp page.
[ ^Top ]13. What does fixed-biased and cathode-biased mean?
Biasing an amp requires setting the amount of DC current flowing through the power tubes while no signal is present. A popular analogy for biasing is like setting the idle on a car. This prepares the tube for proper operation when a signal is applied to the grid and insures the tube will operate within an acceptable and desired range. Setting the bias incorrectly can result in the tube running too "cold," producing an undesirable sound - or running too "hot" which could damage a tube and shorten its lifespan. When the bias current is extremely high, a condition known as "red-plating" can occur. This is when the internal plate of the tube visibly glows red hot. If left unchecked, red-plating can severely and permanently damage a tube.
There are two different primary methods to bias the power tubes of an amplifier: fixed-biased or cathode-biased. The fixed-biased method is also called grid-biased, and the cathode-biased method is also called self-biased. A common joke about the two methods is that the fixed-biased method is adjustable and the cathode-biased method is fixed and not (easily) adjustable, which lends to the confusion on this topic.
To bias a tube amp, the bias current has to be adjusted and set to an optimal operating value. With a fixed-biased amp, a negative DC voltage is applied to the grid of the tube. That amount is adjusted, usually with an available bias pot, to increase or decrease the bias current of the tube. With a cathode-biased amp, the cathode is connected to a resistor and capacitor to ground. The amount of resistance then controls the tube's bias current. This is what gives the tube a "self-bias," but is also why cathode-biased amps really can't be adjusted easily without disconnecting the cathode resistor and installing a new one of a different value.
In general, cathode-biased amps run hotter and are less efficient and tend to be lower powered amps (40W or less.) Fixed-biased amps run cooler and are more efficient, and therefore can generate more power.
The type of bias of an amp has an effect on its sound. Typically, cathode-biased amps have more dynamics, sustain and harmonics. They also naturally overdrive more easily. Fixed-biased amps have a firmer feel and have more headroom, which is good for big clean amps, or high gain, modern amps, where most of the distortion is coming from the preamp.
The SonicTone amp line-up offers both cathode-biased and fixed-biased amplifiers, and they are labeled accordingly in all marketing materials.
[ ^Top ]14. What is negative feedback?
Negative feedback is something that most amp circuits utilize to help flatten and extend the frequency response. It generally makes the amp's output stage cleaner, reducing unwanted distortion and improving stability. The most common way to achieve this is by injecting a small amount of signal from the output transformer back into the phase inverter. The more negative feedback is injected, the more it will increase the damping factor and give the amp a tighter, stiffer feel. This can be advantageous to subdue and amp that may close to the edge of instability or experiencing unwanted oscillations. However, too much negative feedback used where it's not needed may make the amp feel too stiff and sterile, hindering some pleasing overdriven characteristics of an amp. Negative feedback is a simple tool used at the end of an amp's circuit to fine-tune and balance out the amp. Many amp circuits use it to varying degrees, while a few amp circuits don't use it at all.
A handful of SonicTone amplifiers come with a negative feedback selector switch, which allows you to select the amount of negative feedback injected. This switch is called the "punchy/smooth" switch. On the "punchy" setting, there is less negative feedback, so the amp will be more aggressive, dynamic and "punchy" sounding. On the "smooth" setting, there is more negative feedback, so the amp will be tighter and more "smooth" sounding.
[ ^Top ]15. What is the difference between a tube rectifier and a solid-state rectifier?
The rectifier is the first component in the amp's power supply that starts the process of converting - or "rectifying" - the incoming AC voltage into the required DC voltage that the amp needs. The rectifier and the power supply do not process or amplify the audio directly, but the design of the power supply and the chosen rectification will have an effect on the amp's feel and response while playing.
A rectifier is simply a diode. The earliest versions of diodes were vacuum tube rectifiers. As solid-state diodes became more readily available - and less expensive - they became viable options as substitutes for tube rectifiers. Both achieve the same objective, however, a tube rectifier has different internal properties than a solid-state diode. The tube rectifier has internal resistance which creates a voltage drop and "sag." This effects the immediacy of available voltage from the power supply and gives the amp a different feel. Furthermore, a tube rectifier has limits which hinder it from being an option for higher power amplifiers, which is why they are typically used in more vintage, lower powered amps.
Some SonicTone amplifiers come available with both types of rectification and a "tube/solid-state" rectifier switch. This allows the player to chose the type of rectification they want. When set to the tube rectifier, the amp will produce a slightly more vintage sound, where there is a little more compression and sag with the sound. Some players prefer this, saying that it gives the amp a more vocal and spongy sound and that the notes have a nice "touch" or "bloom" to them. However, if that's not your preference, switching to the solid-state rectifier will give the amp a slightly more aggressive sound with a more firm and immediate response. Furthermore, an additional benefit to having a "tube/solid-state" rectifier switch is that if the tube rectifier should ever fail, you can simply switch to the solid-state rectifier and continue playing.
[ ^Top ]16. What type of components are used in the amps?
We don't subscribe to any special "mojo" theories about particular components. We use the best of what's available to deliver a clean sounding, stable amplifier. Many of the myths surrounding these special or "vintage" style components tend to only add noise and reduce the stability of the amplifier.
[ ^Top ]17. What type of wood is used in the cabinets?
All of the woods are affordably sourced birch plywood. All cabinets are constructed using finger-joints for maximum strength and stability.
[ ^Top ]18. Will a SonicTone footswitch work with other brand amplifiers with similar connectors?
The answer is complicated. There's a chance it might, but the schematic and design of the footswitch circuit in the other amplifier would need to match ours. The issue is that there isn't much of a "standard" when it comes to footswitch circuit design in amps. One thing that is fairly common is it seems most amp manufacturers use +12VDC to power the switching circuit and LEDs, as we do here at SonicTone. After that, it's pretty inconsistent on how a footswitch's jack and components are wired.
If you're considering purchasing a SonicTone footswitch to work with your amplifier of another brand, please take a look at the SonicTone footswitch manual - which explains the internal design and layout - and compare it to your amplifier's footswitch design and layout to see if they match close enough for it to work.
If it doesn't look like it will work, there are other options to consider, such as a custom-made cable that routes the wires in a way that makes the footswitch compatible with the amp. For example, if the SonicTone +12VDC wire is pin 1 and the amp's is pin 5, a cable could be made to route pin 1 to pin 5 of the two DIN plugs (instead of pin 1 to pin 1.)
Important Note: Footswitch cable is NOT included with the footswitch. Please see the footswitch cable product page to view the available footswitch cables. Do not supply any footswitch with more than the required voltage. Doing so may cause components within the footswitch to fail, such as the LEDs. SonicTone Amplification is not liable for any damages that result from attempting to use a SonicTone footswitch with another brand amplifier. SonicTone Amplification is also not liable for any damages that result from attempting to modify any footswitch cables or the footswitch itself.
[ ^Top ]19. Do you service other brand name amplifiers?
At this time, we only service SonicTone brand amplifiers. We currently do not service any other brand of amplifiers.
[ ^Top ]20. Do you ship amplifiers outside of the US?
At this time, SonicTone amplifiers ship only inside the US. The amp circuits are all currently designed only for a standard US electrical outlet running at 120 VAC/60 Hz.
