Fired it up yesterday and for some reason, suddenly it sounds like someone hooked a fuzz pedal up to it, like that shit sound you get when you run a bass through an amp sim for a dirty track. Sounds like a blown speaker, but all of the speakers sound exactly the same so I know thats not the problem. All the crunchy goodness is just gone. Now it just sounds like a gay clown gargling cat piss. WTF!? Also it was like the presence kept coming and going, like someone was moving the knob from 0 to 10 every now and then. Any ideas?
5150 Sounds like Chewbacca taking a Shit. HELP!
- Thread starter gixxsta04
- Start date
TheWinterSnow
Den Mørke Natt
with the effect of the presence knob going up and down...bad tubes, either power tubes or the phase inverter most likely.
I recently pulled the 2 outer power tubes and set the impedance to 8ohm going into my 16ohm cab. Could this have anything to do with it? Sounded tougher than a $2 steak for a couple of days but now its just getting that "brown sound"...doo-doo brown. Maybe I'll try swapping the power tubes with the other 2 I have tonight.
Just realized I used an instrument cable for a short time from my head to my cab instead of a speaker cable. Did I ruin my amp?
TheWinterSnow
Den Mørke Natt
Probably not. Using an instrument cable will cause the cable to get hot, short out which will cause your tubes to go into full saturation and this will happen:
[ame]http://www.youtube.com/watch?v=iD40DvztY4E&feature=related[/ame]
basically you blow your tubes.
[ame]http://www.youtube.com/watch?v=iD40DvztY4E&feature=related[/ame]
basically you blow your tubes.
Trevoire520
Member
It wont be the fact that you used an instrument cable, as long as the cable didn't burn out then your amp wont have suffered any ill effects from that.
Best bet is to take it to a tech and get it looked at.
Best bet is to take it to a tech and get it looked at.
guitarguru777
Member
Wtf the fuck is up with all the 5150's falling apart this month ..... lol
Dammit people REGULAR MAINTENANCE ON YOUR AMP IS MANDATORY!!!
Dammit people REGULAR MAINTENANCE ON YOUR AMP IS MANDATORY!!!
TheWinterSnow
Den Mørke Natt
I was actually going to start a rant thread about this...seems everyones 5150s are falling apart.
LEARN TO MAINTAIN YOUR SHIT NOOBS!!!
Especially for 5150's they are designed on the brink of metldown which was stupid on peavey's part, but there are so many basic mods that don't ruin the tone that help ensure your tubes last longer and run better and let the amp overall run cooler, but no one ever thinks about it, nor do they actually do some research to learn the basics of how tube amps work.
gixxsta04 just got the thang less than a week ago, right? Maybe that's why he got it for such a steal. I'm sure after re-tubing and checking for any cold solder joints it'll be good as new.
[lurks on the gas thread]
[lurks on the gas thread]
Nice detective work, bro. Yes I just got this thing. The power tubes are the JJ's out of my 5150II and they sounded fine when they were in it. I can't say much for the preamp tubes other than they were newer than the ones in my II. Hell the mkI sounded killer for the first few days. How do I check for cold solder joints?
lol elementary my dear watson
I wouldnt suggest doing it yourself, get a tech to do it. And tbh I dont really think it's that not having seen the condition of the insides etc. Cold solder joints look like this:
See how it's loose around the post? That can cause bad shit to happen depending on the part involved. Normal wear and tear from gigging and practice, rocking it out loud for years can do this to some amps. I dont know how good peavey is at these things, though. you probably dont have much to worry about on that end but who knows. Regardless, take that thing to a tech asap. He'll know.
TheWinterSnow
Den Mørke Natt
Sounds to me like you have pre tubes for the most part, if a new set of tubes doesn't work only other thing would be oxidized contacts and cold solder joints. Just because the set in the mkI is newer, doesn't mean that they aren't bad.
Bromigo
Member
- Oct 17, 2009
- 51
- 0
- 6
Uhhhh, 5150s are notoriously biased cold as fuck...so I don't know what you mean about the "brink of meltdown" thing, because most people mod them to be biased hotter...
guitarguru777
Member
So you are saying all Andys mixes sound like shit? Why are you here then? 98% of Andys catalog is 5150.
guitarguru777
Member
No V2 is notoriously biased "cold as fuck" the rest of the amp is on the brink of meltdown.
TheWinterSnow
Den Mørke Natt
Little bit different by cold there guru (the terminology changed from preamps to power amps a little bit), but yes V2 is extremely cold, the 39k Soldano cathode resistor in the third stage is responsible for the crunch and high gain sound of the 5150. Let me lay into this idiot, I got this
How an amp is biased has nothing to do with it being on the brink of meltdown. The operating conditions of the tubes at idle is insane on the amps as no one in their right mind would design amps so unstable, however, 5150s are biased very cold at the same time. Regardless of how cold the tubes are biased, they still can be operating under dangerous conditions that limit their life and make the rest of the amp operate hotter/incorrectly. The supply voltages to the tubes exceed what is specified in most datasheets, for example, the max screen grid voltage on the average 6L6 is 450v, where the 5150 has a 100 ohm SGR and a screen voltage of around 480v where most amps will have the screens operating under 450 and have a 1k resistor. And these voltages are higher the colder the idle current is set.
And the biasing of the preamp, hot and cold are references to what side part of the input signal is being clipped on, not actually thermal heat for the most part, doesn't really apply the same concept of thermal heat as push pull power amps.
Bromigo
Member
- Oct 17, 2009
- 51
- 0
- 6
Not even close to what I was talking about, but nice try, bucko.
Well at least YOU actually know what you're talking about (besides calling me an idiot). I just took what you said as you trying to say that 5150s were biased hot.Little bit different by cold there guru (the terminology changed from preamps to power amps a little bit), but yes V2 is extremely cold, the 39k Soldano cathode resistor in the third stage is responsible for the crunch and high gain sound of the 5150. Let me lay into this idiot, I got this
How an amp is biased has nothing to do with it being on the brink of meltdown. The operating conditions of the tubes at idle is insane on the amps as no one in their right mind would design amps so unstable, however, 5150s are biased very cold at the same time. Regardless of how cold the tubes are biased, they still can be operating under dangerous conditions that limit their life and make the rest of the amp operate hotter/incorrectly. The supply voltages to the tubes exceed what is specified in most datasheets, for example, the max screen grid voltage on the average 6L6 is 450v, where the 5150 has a 100 ohm SGR and a screen voltage of around 480v where most amps will have the screens operating under 450 and have a 1k resistor. And these voltages are higher the colder the idle current is set.
And the biasing of the preamp, hot and cold are references to what side part of the input signal is being clipped on, not actually thermal heat for the most part, doesn't really apply the same concept of thermal heat as push pull power amps.
guitarguru777
Member
You still haven't answered my question ... bucko
If 5150's sound like shit then that means 90% of todays modern metal sounds like shit as well as Andys stuff since its his amp of choice.....
Why are you here?
If 5150's sound like shit then that means 90% of todays modern metal sounds like shit as well as Andys stuff since its his amp of choice.....
Why are you here?
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