There are a few reasons why your amp might be making a whistling noise. Here are some of the most common causes:
- Ground loop: A ground loop is a common cause of noise in amps. It occurs when there are two or more devices connected to the same power source, but they have different ground connections. This can create a loop of electricity that can cause a whistling sound.
- Loose connections: Loose connections can also cause noise in amps. Make sure that all of the connections between the amp and the speakers, pedals, and other devices are tight.
- Bad power supply: If the power supply in your amp is bad, it can also cause noise. If you have a spare power supply, try using it to see if that fixes the problem.
- Dirty power: If you are getting dirty power from the wall outlet, it can also cause noise in your amp. Try using a power conditioner to clean up the power before it goes into your amp.
- Microphonic tubes: Tubes can become microphonic over time, which means that they can pick up vibrations and cause a whistling sound. If you think that your tubes might be microphonic, you can try replacing them.
If you have tried all of these things and you are still getting a whistling sound from your amp, then it might be time to take it to a qualified technician for repair.
Here are some additional tips for troubleshooting a whistling amp:
- Try turning off all of the other devices that are connected to the amp and see if the whistling stops.
- Try moving the amp to a different location and see if that makes a difference.
- Try plugging the amp into a different power outlet and see if that fixes the problem.
If you are still having trouble, then it is best to consult with a qualified technician.
Here are some additional things to keep in mind when troubleshooting a whistling amp:
- The noise may be coming from the amp itself, or it may be coming from one of the connected devices.
- The noise may be intermittent, or it may be constant.
- The noise may be louder when you play certain notes or chords.
