Guitar Amp Volume Fades In And Out: Fender Pro 185?



Asked by: Randy Ashman

Why is my amp fading in and out?





It tends to happen when there is a good amount of bass, playing at higher volumes, or when using my fuzz pedal and other similar types. Even with just my phase 90 it can sometimes make my amp suddenly fade out. Check the solder joints on the input jack first.

What causes a guitar amp to cut out?

If the sound fades out and then fades back in, you’re probably experiencing a problem with the power cord. Check the plug for damage, and then carefully inspect the cord all the way back to the amp. If it cuts out and back in with no change in volume, its probably a loose connection somewhere in the signal chain.

How do I fix my guitar amp cut out?

The first thing you can do is take some contact cleaner and just spray it into the jack. Where you normally plug in your cable. And spray it and then work the plug.

Why does my Fender amp buzz?

More often than not, when your amp is making a humming sound, it’s caused by dirty power, a bad ground connection, or fluorescent lighting. Below are a few things to consider when dealing with this pesky hum.

Can bad preamp tubes cause volume loss?





Yes, a bad preamp tube can cause volume loss in an amplifier. This is usually due to the fact that it is not passing the signal correctly or has failed internally.

What happens when preamp tubes go bad?

Preamp Tubes.



Preamp tubes usually cause problems through noise or microphonics. If noise, you will hear hiss, crackling, popping or similar issues. If you hear squeal, hum or feedback, it is typically a microphonic tube. Noise from microphonic tubes will typically increase with a volume increase.

Why does my amplifier cut out when I turn up the volume?

As you turn the volume up the amplifier. Has more of a demand on your electrical system when it cannot draw the right amount of current needed.

Why does my amp cut off when I turn it up?

If the car stereo or amplifier powers off when raising the volume, then there may be an issue with installation. This usually occurs when the ground wire is not connected properly. However, it also can occur when an amplifier becomes overloaded by connecting too many speakers.

When should I replace my guitar amp valves?

A: These are the most common signs that tubes need replacement:



  1. Excessive noise (hiss, hum) including squealing or microphonic tubes.
  2. Loss of high end. …
  3. A muddy bottom end; Sounds like there is too much bass and note clarity is lost.
  4. Erratic changes in the overall volume. …
  5. The amp doesn’t work!


How do you fix a buzzing amp?

The first thing you should do is to just unplug instrument cable from your amp. If the hum vanishes, your amp is probably OK. If hum continues, then start with the pickups, roll off the volume on your guitar, and see if it goes away.

What causes buzzing in guitar amp?

It’s either a result of the pickups you’re using, interference getting picked up by your guitar or a grounding issue. Note: it’s normal for an amp to hum when a lead is plugged in but not plugged into a guitar. So if you have your lead lying on the ground while plugged into your amp, don’t stress if you hear noise.



Why is my Fender amp crackling?

Random Crackling and Pops



This typically signifies your amplifier has faulty power tubes. First, try swapping them one by one with a spare tube. If this does not fix it, then the preamp plate and/or cathode resistor need to be checked out (this is probably something to get a professional tech to do).

How do you tell if a tube is bad in an amp?

Loss of Power and other Odd Noises



Sometimes you will hear strange sounds, loss of power, or heavily distort sound. These are signs that a tube is failing. Often power loss that seems like the amp is performing at half power or less will be one or more bad power tubes, or even a dying phase inverter tube.

How do I know if my guitar amp is blown?

The most common aural indication of a blown speaker is an unpleasant buzzing or scratching sound, by itself or roughly at the pitch of the note the speaker is attempting to reproduce. Or there could be no sound at all.

What are the symptoms of a bad output transformer in a tube amp?

A bad tube can cause lots of different symptoms including everything from complete signal loss, hum, hiss, static to something that sounds like whale sounds.



Why does my tube amp loses volume?

Bad tubes will make volume drop and tone sounds will be dulled. When a tube goes bad, this is exactly what happens. Turn off your amp (like before) and after 10 minutes you can wiggle and pull down the tube.

How do you test a fender output transformer?

Under test hooked up primary is going to the two leads that would go to the plate caps of your tubes. Okay secondary meaning your a tone speaker is going to this output meter.