Great topic, I wondered that as well..! I've got a little Peavey practice amp that always pops and I do as you've suggested, I always have the volume turned down while turning on... Thanks for the excellent info, and for sharing..Ed..uk..😀
@DeadKoby
3 жыл бұрын
No problem. I have gotten comments about amps I've fixed here before.... and they read something like "I have this model amp, but it makes a big pop when I turn it on.... what is wrong??" I thought the world needed to be told it is normal.
@magnetboymusic
18 күн бұрын
Thanks for explaining
@Whats_Vong
2 жыл бұрын
Always wondered why my F**der combo always Pop's loudly (even with volume turned down)when powering off,ignored and passing it off as a manufacturing boo-boo. Thanks ,very informative.
@DeadKoby
2 жыл бұрын
Most of the Solid State amps below 150w will pop or thump in some manner. Big ones, and hi-fi ones usually have the speakers on a relay, so that amp starts up on a resistor and then in moved over to the speakers.... That kind of protection circuit can save speakers.
@Swordsnstuff
Ай бұрын
Good to know this is normal! Cheers. :D
@DeadKoby
Ай бұрын
For many amps, it's just how it is.
@jeddak
Жыл бұрын
Another approach is to add a switch to detach the speakers from the output transistors; you'd use this like a 'standby' switch on a tube amp. Lower cost and more robust than a hi-fi style pop-suppression circuit.
@Pstaines439
Жыл бұрын
Great video thanks. I really want to find a solution (install a relay?) for my SS Marshall. In the meantime I just unplug the speaker before turning it off.
@DeadKoby
Жыл бұрын
Try Zeroing out the gain and master volume... that usually helps most, if not eliminating the big thump. Its amps without a master volume that REALLY thump.
@kiwibass
Жыл бұрын
So I've got this mid-80's Marshall 5275 Combo, which makes a *very* loud POP whenever I power it on. What I found out is that when I flick the power switch very slowly and carefully, that pop noise is almost gone - or significantly lower, at least. My theory is that when I switch it on this way, the mains power sort of "builds up", due to arcing between the switching contacts, instead of fully hitting the circuit right away. Although this is certainly harder on the power switch, it could still be considered the lesser evil, as it's much easier and cheaper to replace that switch - instead of having to replace other downstream components (esp. speakers)! What do you think?
@DeadKoby
Жыл бұрын
I have no opinion. If your amp has a master volume, turning it to zero usually does the trick.
@naegleriafowleri2230
Жыл бұрын
Some powered studio monitors do this too is annoying but you get used to it lol
@DeadKoby
Жыл бұрын
Yes indeed. PA amps... any sort of modest power solid state amp without a protection relay will do that.
@blank_9565
2 жыл бұрын
So i turned down the volume and the thump’s reduced to an amount about as loud as the amp when the volume is on 3. It doesn’t fully go away so i was wondering if it was bad or not. Does the popping destroy the speakers or is it nothing to worry about?
@DeadKoby
2 жыл бұрын
It should be safe. If the volume pot helps, use it. The preamp is likely sending half of the "kick"
@mversantvoort
Жыл бұрын
Great video! Finally found the answer. My Fender bass and guitar practice amps only do it when turned off, is that normal? One (25W guitar amp) does it right when turning it off, but the 15W bass amp does it a second after turning it off. Also, the loudness of the thump varies greatly with the 25W guitar amp when turning off, what could cause that and can I prevent it? Thanks a lot!
@DeadKoby
Жыл бұрын
Depending on the amps design turning the volume to zero can minimize it
@charliesalter3744
2 жыл бұрын
Does grounding/ earthing the amp affect the thump too? I just got my first electric guitar and amp 2 days ago and it still makes loud pops (mostly when the amp gets switched off) even with volume all the way down, so im wondering if anything else affects the popping sound
@DeadKoby
2 жыл бұрын
Mostly the circuits design.
@tomandlino
Жыл бұрын
Hi, thanks for your video, it helped to understand the general case. Maybe you can point me in a direction here: I have a Laney GC 120CC which makes a massive POP when turning on and off, it gets the speakers visually kicked to the maximum, unlike what I see on your videos. Any ideas what it could be? Or do you think this is also normal. Could it be a broken capacitor or something like that? Many thanks!
@DeadKoby
Жыл бұрын
Its likely just an imbalance in the transistors. Zeroing out the volume minimizes it.
@nearchd504
Жыл бұрын
@@DeadKoby i have the same problem as op , i made a delay on circuit using 555timer ic. A resistor, a capacitor and a relay. I hope the ic has enough ampere to operate a 12vdc relay. I haven't tried it yet on my amplifier yet. I got a 18 seconds of delay .
@MrAndfio
2 ай бұрын
Very interesting video...I have a Bugera 1960 Infinium tube amp 150 watt...When i switch on it thumps and pops so i make sure it is turned down low for around fifteen minutes to warm up and stop popping. But at times it will pop a couple of times when i play through it even after an hours playing...What can cause that ?? regards
@DeadKoby
2 ай бұрын
Tubes can tick and pop with expansion as they come up to temp. Search out microphonic tubes.
@MrAndfio
2 ай бұрын
@@DeadKoby Thank you..i will look into that..best regards.
@DeadKoby
Ай бұрын
Not a problem. Best wishes finding your solution.
@user-lm4vd4tu7w
Жыл бұрын
Hi , great video. So does the pop or thump damage my amp ? I always turn the volume down on the amp before turning it on or off. However I'm thinking of setting the volume of the amp at a constant volume just so that I don't have to adjust it every time I turn it on or off. I also have a little headphones jack without the headphones attached that I use when turning it off and on...maybe this helps ? It's just my Fender Princeton amp is very sensitive at low volume... level 1 is ridiculously loud for bedroom. I think it's a reverse log scale, 1-10. So tomorrow I'm going to get the volume just right on my amp so I don't have to constantly set it up every time I play. I just hope it doesn't damage my amp? The popping thumping sound ? Is the headphones jack good to insert when turning on and off? Thanks for any feedback. Great video and explanation of the science behind the amp
@DeadKoby
Жыл бұрын
If it's coming from the pre-amp charging up, then the volume will help reduce the thump. It's unlikely it can hurt the speakers.
@squirelova1815
3 ай бұрын
"The more you know..."
@DeadKoby
3 ай бұрын
Many models won't thump or pop if you zero the volume first. Depends on the design though.
@squirelova1815
3 ай бұрын
@@DeadKoby Yeah, and btw, I've read of so many folks complaining in reviews about the Fender Champion 20 popping when shut off and THAT is the first thing I thought: of too: Why don't they just TRY to Zero out the knob aka turn OFF the Volume level? "Common Sense" is NOT so common as I've gathered. Good thing for Knowledgeable Scientists techs like yourself that can Confirm and explain "problems" like this that may not be actual problems at all to save people from tragically returning Perfectly Good sounding and functioning Amps unnecessarily.
@russk8091
2 жыл бұрын
My vintage Kustom 100 sometimes continually thumps very loud and you can see the two 12" speakers move. Bad transistors?
@DeadKoby
2 жыл бұрын
Or unsteady power supply.
@pahaahv
Жыл бұрын
I have a MG15CD (15 watt solid state amp) that does crazy loud pop when switched on or off. Volume doesn't seem to affect it in my case. Should I look for some problems in the circuit, maybe caps died out? The amp is soon to be 20 years old.
@DeadKoby
Жыл бұрын
Some of them just do that. It's probably fine.
@Casualfulltime
10 ай бұрын
I get pops on and off and also randomly during play back. Is that normal?
@DeadKoby
10 ай бұрын
While you're playing, it could be static or the cords.... but during play isn't normal.
@-k-b-
2 жыл бұрын
I can't tell if my solid state Acoustic 450 bass head is making popping noise or my cabinet (SWR Big Ben), any advice on how to know which one is maybe damaged? It keeps making popping noises, I'm worried because it only started after using a foot switch that was clearly not the right one (trying to find the right one is pretty tough I've found)
@DeadKoby
2 жыл бұрын
With an incorrect foot switch, you may be getting erratic triggering. Anything I tell you is really just a guess.
@totalbullion5882
Жыл бұрын
Does anyone know if it's possible to add a relay like the Peavey has to an amp that doesn't have it ? I've got an Ampeg guitar amp that thumps so hard when you turn it on it'll knock you out of your shoes lol.
@DeadKoby
Жыл бұрын
Did you try ZEROing out your volumes when powering it on or off? That usually helps.
@raymondleggs5508
Жыл бұрын
I have a stereo receiver that does the same thing, if I have the subwoofer on it will shake the whole house when you power it on, you can hear the kitchen below rattle lol.
@totalbullion5882
Жыл бұрын
@@raymondleggs5508 lol
@totalbullion5882
Жыл бұрын
@@DeadKoby It doesn't help. I think it needs the power caps replaced but that's just my amatuer guess.
@rockman49er
2 жыл бұрын
My old qsc 1400 does this now I know it ok 👍
@robertfullone9032
Жыл бұрын
I got an old grestch that thumps when im trying to play it. It now sits and is never used. The speaker is too physical. Wish i knew what to do. I'm going to try a different speaker at some point. The amp is probably 40 years old.
@DeadKoby
Жыл бұрын
It's likely in need of a "cap job" if it's 20-30 years of age. I would start there. I've done LOTS of cap jobs on amps right on this channel.
@royrush5374
3 жыл бұрын
My boss katana artist makes a tiny blip barely audible
@DeadKoby
3 жыл бұрын
It may have a soft-start or a relay circuit. I could tell you if I see the schematic. Most old school AB amps DO thump, and some people think they are broken. Depending on circuit design, sometimes you get it on power up, sometimes on power down. VERY powerful amps like the 700w Peavey have a relay system. You'll find that sort of stuff in your better PA amps too.
@God-CDXX
3 жыл бұрын
ps great vid
@God-CDXX
3 жыл бұрын
Dead Koby give me a ping some time you missed the real cause of the pop it is not the power reals
@petercornell2002
3 жыл бұрын
Hey GM, be interesting to know your reason..... Tx
@DeadKoby
3 жыл бұрын
Glass Monster and I sometimes talk online. I'll get his perspective, but I THINK he needs to use his KZitem channel.
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