i blew my speakers.... :(

i blew my speakers on my jmp...sad face lol. i think so, im getting a sound 2 octaves below the normal sound on nots o the g b and e strings above the 7th fret, i cranked it a couple times and the tubes dont appear to be the prob so i think i blew a speaker. how much would it cost to repair that? how much are new tubes?

You haven't even had it for a week and already messed it up? Dude. Hendrix could replace his stuff. Take that into consideration lol. And for the speaker prob [and I'm not real sure] fifty or sixty bucks?

If you just bought it, and you've still got the reciept, trade it for a new one, and ACT REALLY MAD!! You get bonus points :D

@EMB,
You need to have the unit looked at. Have it inspected by a pro. there is much more to that than just tubes and speakers. They use some electrolytic capacitors in there that could possibly be "leaky" and if the unit hasn't been used in a while they might also have dried out. Don't screw around with it beyond your abilities.
Phip

note for next time. dont go to 8 lol

You may be able to have the speaker re-coned. I used to know a guy who did it for $50 a speaker. it may also be in your head but i agree with Phip have it checked out by a pro

nah other people agreed with me, im gona get it checked out, and im not returing this thing. its my baby! it sounds amazing, even if i cant get that fixed im keeping it!

Emb, you are hopeless. You know that? :P. Darn hope you get it fixed m8.

a blown out speaker makes a popping/farting noise or no noise at all,
depending on whats wrong.

tears sound like farts.
separation of the woofer from the upper/lower surrounds makes a pop noise
a loose voice coil will also make a pop noise.
a broken voice coil will produce no sound at all.

i'm led to believe by your description it's a shorting tube.

if this is an open back and you can see the tubes, spin it around
and play while watching the tubes from behind. if you see any color
other than the normal orange light, that tube is faulty. a shorting
tube will pulse with every note/chord played and is usually a blue light.
tubes can go at any time,it's not uncommon. retubing the amp
will only make it sound better.

inspect the speaker yourself,simply look at it for visible tears.

no farting noise. no popping. nope just orange light. no visable tears, maybe is my guitar? it didnt do it with my other amp tho.

That's what you get, n00b.

seems you'll def need a tech for this one.

ebay is great for speakers,so isn't craigslist.
if it were a speaker problem,i'd replace it with
a celestion vintage 30 about $130 new,bout $75 on ebay

if it needs retubing of just the power amp your prob. looking about $100
a full retube runs about $150 for good tubes.

kk thnx nothiung too expensive thehn.

Aww, poor EMB! You blew up your child, how on earth did that happen? :D Get it checked out, but you must REALLY like it if you wouldn't even want to swap it at the store for a new one if it is done for.

i stuck a grenade in it.



theres a couple probs in that...

1)its made in 1978, im afraid not only are they rare but unless i have a time machine i cant get a new one
2)this one sounds amazing
3)i bought it on consignment
4)ye thats it.

Well, just promise me youi'll NEVER throw grenades in a great old rare thing again..or into/at anything for that matter.

@ EMB5490

http://cgi.ebay.co.uk/Vintage-CELESTION-Red-Label-8k-Guitar-Amp-12-Speaker_W0QQitemZ260320512665QQcmdZViewItemQQptZGuitar_Amp_Accessories?hash=item260320512665&_trksid=p3286.c0.m14&_trkparms=72%3A1298|66%3A2|65%3A12|39%3A1|240%3A1318

If you hurry you'll be just in time to bid!!!

yay! heres my new problem, because what would like be without problems!!!! yay! well i didnt blow my speakers...BUT! (omfg thank you for the but, i need a prob) my bass channel doesnt work when jumped. (hint: its not the cable) i plug into my lead 1 channel its fine, then switch to the 2nd led channel, and the volume decreases drasticly. like a whole hell of a lot. just as soft as the low sensitivity slot for the 1st lead channel. anyway, so it works but its softer and doesnt work when jumped. also my bass eq doesnt work now. it doesnt do a hell of a lot of anything... like midly increases the bass, but barley.

Did you take him into a guitar tech or the place you bought it yet? They could help diagnose/fix the problem. It may just be a blowed tube and its a relatively inexpensive fix.

This is problem with vintage used gear. It's old already, plus it could have been owned by some bozo who spill beer and cigs on it and drop it down the stairs. Plus you can't get a new one when it breaks and you have to pay repairs on it.

Ok well, i'm not the worlds expert on amps but, as i understand it the 2nd channel is weak, much weaker than the first channel yes? there may be a coupling capacitor on the input that is leaky or there may be a dropping resistor in there that has opened up. also each input may have it's own amplifier or buffer tube, so it may be a weak tube. none of these things are a big deal so don't worry. a suggestion, when you have a few spare bucks, buy a set of tubes as spares and keep them in a safe place. when you have a problem like this you can do a quick tube check by changing tubes (one at a time) and fix the problem right on the spot. forget about resistors and capacitors, those are beyond your scope of knowleged, but tubes are easy to change. as far as the bass problem, i'll leave suggestions to some other members.
Oh and ALWAYS unplug the unit from the electric outlet before reaching into any electrical device.
hope this helps,
Phip

are the probs connected? both increase bass and volume...does that go into one tube or somthing, and not the tubes are fine, none are broken.

they actually may (and prob do) use seperate tubes. this may explain why one channel is weak and the other is good. most likely they use the same tube type. you really can not tell if a tube is weak by looking at it. this is why it is good to have a set of good tubes for testing. another trick would be to switch the tubes for channel one and two and see if the problem "moves" to the other channel. if so, you know that one of the tubes is weak. BUT you have to know which tube(s) are the preamps for channel one and two. for that you would need a diagram. some units have a paper diagram on the inside cover. also you might be able to download the diagram online. NOW REMEMBER, ALWAYS UNPLUG THE DAMN THING BEFORE YOU REACH IN THERE. OK? please give me make and model and i'll look for a diagram online right now for you. maybe i can identify the correct tubes for you.
Phip

well...see heres the thing, it worked fine until i transproted it to get "fixed" which in the process of finding that nothing was wrong, i created another...or i blame my mom who "helped" me and by that made me slam it into the car.

its a marshall jmp mkii superlead, 1978.

ok i'm looking for that right now. stay tuned

kk what station are you on again?

lol, ok i have diagrams. i am going to PM you from this point on.

update update update!!!! i turn on the bass channel and turn it up to one "(normally i need ear plugs but i can go without now. i hear a rattling noise inside glass! i go check!

be careful elliott. that thing can bite you if it's not unplugged!

ill be careful ^.^

acording to the diagram all four inputs are fed into one tube. the tube is a dual channel tube. too technical to explain but in short, the two channels in the tube act somewhat independently to a small degeree. this is the tube you should suspect. however the diagram is so crappy i can't read the tube number! i will look for a better diagram. meanwhile i would rest easy that you prob have a bad tube. you can't buy one tonight and prob not on a sunday so that will give me some time to check for a better diagram ok?

elliott?
Damn the kid blew himself up. let me know if you are done so i can sleep tonight will ya?

did he have a will?? who gets his amp??

@ BBT,
I get the amp! He would have wanted it that way! LOL
Phip

by the way, for any of you who have marshall amps, bookmark this page http://www.drtube.com/marshall.htm
there seems to be schematic diagrams for most of the marshall amps going back to 1959. good reference material for you do it yourselfers.
I didn't know where else to put the link.
Elliott, you alive?
c'mon kid, post something.
Phip

ok, well, this is for Elliott's next of kin. There are three tubes in the amp marked V1, V2 and V3. all of these tubes should be tube number ECC83. most likely the cause of the problem is one of these three tubes. this makes buying a spare set of tubes cheaper because you will only need one ECC83 to diagnose the three. now there are either two or four rectifier tubes in your amp. these are tube number 6550 and labled V4, V5, (and V6 & V7). so all you really need to buy for a quick diagnosis are two tubes. not bad.
hey, also, if you bumped the thing maybe one of the tubes is unseated from it's socket. check that, and stop blaming your poor mom! geez
Phipster

I think Elliott is the one all the way to the left. Looks like him.

there are no marshals in 1959, it started in 62 and 63.

@everyone who thinks im dead....come...come closer....closer...closer...free hugs! lol

im guessing i shouldnt play it...

look at the your input output theres probably a fray and that migt be the promblem. that happened to me and i tried to fix my amp and the people at the store said there was nothing wrong with it then i looked at the input canble and the inside wire was cut in half...so.

well glad to see you survived. yes you are correct 1962 my mistake. at a quick glance i read this and saw 1959. Their first amps were very heavily "inspired" on the 1959 Fender Tweed 4x10" Bassman. I messed up!
So you gonna tell us about your little adventure inside your amp and can you tell me, how many tubes inside the case?
Phip