PDA

View Full Version : Popping amp when turning off :(



ShootTheGlass
July 5th, 2008, 05:11 PM
I have a lowly Peavey Bandit 112 (its not that bad for a SS, honest!). I actually quite like the sound of it when playing heavier riffs.

Only problem is, regardless of what I seem to do, it pops like a good 'un when I turn it off after playing. Sometimes though, it doesnt seem as bad.

Is this normal, or is there a sneaky way to get it not to pop?

:)

just strum
July 5th, 2008, 05:32 PM
I noticed that on my AD30VT a couple of times. It seems if the kids turn the fan on in the one bathroom, it will pop when they turn off the fan. That I can understand, but later when I turn the amp off, it will happen again. It only seems to happen when someone turns the fan on - strange.

I know someone here can explain it, but I would pay attention to see if anything out of the ordinary happens on those occasions it pops. The only thing I've been able to do is make sure I turn master volume and the other volume (does it have a name) all the way down before turning it off. It may still be popping, but at least I don't hear it.

Rocket
July 5th, 2008, 05:32 PM
Roll the pots off before you switch it.

just strum
July 5th, 2008, 05:48 PM
Roll the pots off before you switch it.

huh

Rocket
July 5th, 2008, 06:07 PM
huh
For Strum: Turn all the knobby thingies down to zero before pressing the o-n / o-f-f switch.

just strum
July 5th, 2008, 07:03 PM
For Strum: Turn all the knobby thingies down to zero before pressing the o-n / o-f-f switch.

Right. See same thing, just different lingo

aeolian
July 5th, 2008, 09:34 PM
I bought an Ampeg BA115 bass amp a few months ago through Craigslist. When I went to check it out the owner told me that the only problem with it was that it pops when turning off. It actually was a pop and the sound of capacitor discharging. I was wary, but the price was good so I took it home.

Since then I've been told by several people that their amps do the same thing. One said his amp has been doing that for years and is still going strong. So far my Ampeg is working fine too except for the pop.

markb
July 5th, 2008, 11:11 PM
My TM60 pops unless it has been on for more than about half an hour. I suspect it's in the power supply, maybe an imbalance in the smoothing capacitors.

TS808
July 6th, 2008, 07:40 AM
The Bandit 112 is a cool amp...Peavey's transtube series was one of the best innovations in solid-state amps.

Alot of solid-states "pop" when you turn them off....I remember my first amp (a Fender Deluxe 85 that I bought in the 80's was notorious for that). Like others have said, the best way to avoid that is to turn down the volume knob on your guitar or amp the whole way down before shutting the amp off.

Although it's annoying, I don't think it does anything to harm the amp.

ShootTheGlass
July 6th, 2008, 04:37 PM
Thanks guys.

Turning the knobs down seems to be pot luck, sometimes it makes no difference :)

Nevermind, as long as its not unheard of for amps to do it :)

pes_laul
July 6th, 2008, 05:14 PM
I noticed that on my AD30VT a couple of times. It seems if the kids turn the fan on in the one bathroom, it will pop when they turn off the fan. That I can understand, but later when I turn the amp off, it will happen again. It only seems to happen when someone turns the fan on - strange.

I know someone here can explain it, but I would pay attention to see if anything out of the ordinary happens on those occasions it pops. The only thing I've been able to do is make sure I turn master volume and the other volume (does it have a name) all the way down before turning it off. It may still be popping, but at least I don't hear it.
I have the same thing happen with fans on my amp.

it I think It has to be a ground problem with circuitry and what not.


while I'm at it I got a question of my own....
WHen I'm in my room with the telephone I can hear the numbers dialing through my amp. whats up with that?:confused:

TS808
July 6th, 2008, 06:24 PM
while I'm at it I got a question of my own....
WHen I'm in my room with the telephone I can hear the numbers dialing through my amp. whats up with that?

It's a speaker phone!! :D

Seriously, every once in a while with certain amps (especially solid states for some reason), I used to hear the radio being picked up too through the amp. Not sure why that happens, but it can happen once in a while.

Duff
September 11th, 2008, 03:34 AM
My new Delta Blues, Peavey, pops lately when I turn it off. I checked everything I could think of but you guys, as usual, have given me some more things to check. I have a fan plugged into the same power strip. Might be related.

My gut feeling is that it is a ground problem of some sort.

Probably should check it on a dedicated grounded extension cord before taking it in for warranty repair, if covered under the warranty.

Duff

My cell phone always chirps thru my tube amps every time the system checks in with the phone but the phone is within four feet of the amp and inches of the guitar cable.

WackyT
September 11th, 2008, 07:33 AM
My Fender Champion 30 pops when I turn it off with the switch on the back, but doesn't when I power it off at the powerstrip.

ShortBuSX
September 11th, 2008, 08:19 AM
When I was a kid I had a Peavey Bandit 65 that would make a farting noise when youd turn it off, and not like a "farty speaker" but more like the dog just cut the cheese...it didnt matter what volume it was at, it was the same everytime.

Spudman
September 11th, 2008, 09:26 AM
My new Delta Blues, Peavey, pops lately when I turn it off. I checked everything I could think of but you guys, as usual, have given me some more things to check.

My gut feeling is that it is a ground problem of some sort.



They all do that. Usually switching to a different channel will keep the pop to a minimum. I'm not sure which channel is the culprit. It's either that or try turning down the reverb before turning it off. It's just a characteristic of those Peavey tube amphs.

Duff
September 12th, 2008, 01:08 AM
Great to know Spud. I won't worry about bringing it in for service.

However, I have noticed a buzz coming from the amp, especially on lower notes, any volume.

When I press against the magnet it stops. So I braced the magnet with some pressure with some wood and wood shims. Totally buzzless.

First, before solving the prob with the cob job, I tightened all of the speaker nuts inside the cab. No change.

Maybe I should take off the grill and see what I find. I suspect a gasket or loose bolts holding on the electronics components box that the transformers are attached to and the tubes come out of.

I'm thinking there are securing screws inside the front behind the grill cover that I can tighten up.

This, however, does not explain why pressure on the magnet from bottom toward the top would do anything other that to put pressure outward on the speaker mounting board that the electronics control box is screwed onto, possibly taking up enought slack to stop the vibrating that causes the buzzing.

Duff

Probably should make this a new thread.

ShortBuSX
September 12th, 2008, 07:29 AM
Sounds like your speaker baffle, you could probably snug that up on the sides of the amp(those screws)...or you may even have tube rattle, its not that uncommon among tube amps with some decent low end.