With many speaker devices, obtaining a clean, clear signal is sometimes difficult. Speakers and amps can often hum or hiss. Though there are many things that can cause this problem, it is sometimes the result of the signal you are using not being grounded. This issue is fairly common for those playing guitar through a Fender Twin Reverb amp. Luckily, there are a few things you can do to ground your amp's signal before you are forced to take it into a guitar shop and have it professionally repaired.
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Things you need
- Fender twin reverb amp
- Power outlet
Turn on your amp, listen for any buzz and adjust the ground switch. Before you begin worrying about any major problems with your amp, check to make sure that the ground switch is set properly. The ground switch is located on the rear panel of the amp and has multiple switch options. Plug in your amp and then toggle the ground switch until you hear the least amount of hum or buzz possible. If you're lucky, you may hear no buzz at all.
Adjust the hum balance. If you are still experiencing a hum or buzz in your amp after you have adjusted the ground switch on your Fender Twin Reverb, the next step you can take to ground the amp's signal is to adjust the hum balance. To adjust the hum balance, first, make sure nothing is plugged into the amp, and then rotate the vibrato channel volume, middle, and bass controls full clockwise. Then, fully rotate the vibrato channel treble control and the normal channel controls counter-clockwise. Next, turn the reverb and vibrato settings off. After this, place a slotted screwdriver in the hum balance control. Rotate the control back and forth until you can eliminate the hum by grounding the signal.
Have the bias adjustment adjusted at a Fender Service Center. If, after you have used the ground switch and adjusted the hum balance, you still have a hum or buzz, the next step you need to take is to have your bias adjustment adjusted. Adjusting the bias is a very technical task, and it is suggested by Fender that you only have this adjusted at an authorised Fender Service Center.
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