Sub amp repair.

[Nestor]

I thought I would put together a 5.1 system with extra components I had for a dear friend who helped me through a recent motorcycle accident.

One of the components I want to give her is my Paradigm PW-2200, but I first have to try and repair an unusual symptom.

For the most part, it works fine, however, on a few occasions, it's gone into some sort of positive feedback mode when on standby. Think of a loud double kick bass a la Van Halen's "Hot For Teacher", for lack of a better analogy, and at max volume.

It's happened a couple of times during the wee hours of night scaring the bejeezus out of me during a peaceful slumber. The receiver has never been on during these episodes.

Obviously, I don't want to have it do the same thing to her.

Any guesses as to which cct I should look at first? IMO, I'm thinking either the power supply or the input signal sensing cct used take the amp out of standby mode.

Any, ahem, feedback, is appreciated!

Thanks!




Sent from my Vox using Tapatalk 2

 

[j_garcia]

The amp is definitely failing in the sub and the only way to prevent it from happening is to unplug it. Call Paradigm, my guess is they will just have you replace it with another amp if they still have them. Good chance it is failing capacitors.

 

[Nestor]

I should mention that I have a scope, soldering station, and time, so I'm not averse to giving it a shot before I write it off.

I'd replace the amp with a BASH 300 or 500, but it would take some fussing to make the plate fit where the old one is.

Sent from my Vox using Tapatalk 2

 

[j_garcia]

Since you can solder, you might just pull the amp and see if it looks like it is the caps and if they are easy to replace. One of the PE bash amps would likely work if it looks like a bunch of stuff to replace.