Product Support/FAQ

This page has been created to help answer some common questions that we receive in hopes that it will help you get back to making music as soon as possible. If you don’t find what you need here, please call us at 1-877-4-AMPWORKS and dial Extension 2 for Support.

You can also you can reach us at support@jacksonampworks.com We normally will have support issues replied to within 1 hour during normal business hours.

I turned my amp on and nothing happens. What do I do?

Typically this means you have blown a fuse. If the main lights on the amp will not turn on then you have likely blown the Mains fuse that is located in the IEC module.

 

I turn my amp on the and I hear the fans and I see indicator light turned on, but I get no sound. What do I do? 

You have likely blown the B+ fuse which is located behind the back panel of the head cabinet. Check to see if it is blown and if it is, replace it with a Slo-Blo fuse of matching current rating.

 

Why is my amp making popping, crackling and hissing noises?

Typically these types of artifacts are heard when the power tubes need to be replaced.

 

 Why doesn’t power scaling doesn’t seem to get quiet enough?

Quiet is a very subjective thing. On our amp the lowest position on the Power control is around 1/8th of a watt! That is still louder than most people would think but still completely useful at bedroom volumes.

 

 Why does power scaling seem to get more distorted the more I turn down the power knob?

That is because as the output tubes create less power, they will more easily be overdriven. So to combat this, we have found that if you roll your guitars volume back a bit at lower positions on the Power control you can get the amp to clean up fairly easily.

 

How can I get more headroom on my amplifier?

The easiest way to get more clean headroom out of an amp is to use lower gain preamp tubes. For instance you can almost always replace any 12AX7 tube with a lower gain one like a 12AT7 or a 12AU7 if you want greater clean headroom.

 

How often should I change my tubes?

 Because tubes are like light bulbs, they will need to be changed over time, the only question is when. Unfortunately, there is no set answer to this question. If there were a set answer to this question, it would likely be, “Whenever they need changing.” Obviously this answer is not very informative so the following guidelines should be used when considering changing the tubes.

While preamp tubes will often last indefinitely, output tubes should be changed whenever the performance of the amp is compromised. If you start to notice the following symptoms, chances are its time to change your tubes. Note: The type of tube that usually causes this type of symptom is listed in parenthesis.

1. Your amplifier seems to have lost output and punch (output tubes)

2. Your amplifier seems to have lost definition (output tubes)

3. Your amplifier seems to have lost low end (output tubes)

4. Your amplifier makes hissing or squealing noises (preamp tubes)

5. Your amplifier sounds weak and lifeless (preamp and output tubes)

 

Do I need to rebias my amp when I change tubes?

It is always advisable to rebias your amplifier when changing tubes. Because the new tubes you have purchased may not match the previous tubes you were using, it is recommended that you set the bias for the new tubes. Many of our amps however are cathode biased and as such do not require them to be re-biased when the output tubes are replaced. 

 

 How long do I let the amp stay on before I turn it off standby, what is the best practice for turning off my amp?

Typically 1 minute is enough time to let it warm up before playing. You can always turn an amp off; there is no shut down procedure.

 

What different tubes can I put in my amp?

That really depends on the tubes you are trying to replace. You may notice subtle differences between different manufacturers of tubes so experiment as much as you like! 

For instance you can almost always replace any 12AX7 tube with a lower gain one like a 12AT7 or a 12AU7 if you want greater clean headroom.

Power tubes on the other hand can only be replaced with like tubes from different manufacturers.

 

Can I use NOS tubes?

Yes! Absolutely! 

 

How do I change my amp from 120/240?

Here you go! We made a little video to help show you how this is done. Enjoy!

 

 Can I get my amp rewrapped?

Unfortunately no. We have found through trying that the glue that we use is so effective that it typically will destroy the plywood cabinet if we remove the tolex from the cabinet.