#1
Hey guys, so I have a fender champ from 1977, even though my sig says 78, it's wrong. About a month or maybe more ago it started making this really nasty buzzing sound when I would play certain notes really loud or when I would hammer chords hard. I have an Mp3 of how it used to be in my profile. Now it's simply a lot worse. I figured it was my tubes going bad, so i replaced the preamp tube, no fix, I just replaced the power amp and the rectifier, no fix. Anyone have any idea whats going on? I would really appreciate help, this has been bothering me for quite some time now.
Winner of the 2011 Virginia Guitar Festival

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#3
Quote by Dirk Gently
Blown speaker?



I've considered that. I unfortunately have no way of testing that. I took the speaker out and it LOOKED fine but I don't know much about speakers so something could have escaped my eyes.
Winner of the 2011 Virginia Guitar Festival

Protools HD
Lynx Aurora 16/HD192
Mojave, Sennheiser, AKG, EV etc mics
Focusrite ISA828 pres
Waves Mercury
Random Rack Gear

65 Deluxe Reverb
PRS CE 22
American Standard Strat
Taylor 712
#5
Quote by james4
^if it might be the speaker, just try hooking your amp up to a speaker from one of your other amps..

just be aware of impedances and all that..



All my other amps are at home. My roommate's marshall has 2 16s which I could wire to be 8, but that's still way too big of a mismatch.
Winner of the 2011 Virginia Guitar Festival

Protools HD
Lynx Aurora 16/HD192
Mojave, Sennheiser, AKG, EV etc mics
Focusrite ISA828 pres
Waves Mercury
Random Rack Gear

65 Deluxe Reverb
PRS CE 22
American Standard Strat
Taylor 712
#6
Okay, so I grabbed a 4ohm speaker from one of my dorm mates and went ahead and ran it through. I can still hear the hissing/buzzing/whatever problem. Any other ideas? I'm about to take it to a shop but I don't want to pay a butt load of money if I can just get a new (old) champ
Winner of the 2011 Virginia Guitar Festival

Protools HD
Lynx Aurora 16/HD192
Mojave, Sennheiser, AKG, EV etc mics
Focusrite ISA828 pres
Waves Mercury
Random Rack Gear

65 Deluxe Reverb
PRS CE 22
American Standard Strat
Taylor 712
Last edited by Artemis Entreri at Oct 30, 2009,
#7
microphonics? when was the last time you replaced preamp tubes? won't be power amp tubes cuz they don't make microphonics, they're failure is exhibited more by volume drops. another culprit is filter capacitors(aka 'caps'). time for a little 'old amp love' from a tech.

artemis entreri huh, last time i checked he was hanging with jarlaxle :P
punk isn't dead, it's always smelled that way.

"A perfection of means, and confusion of aims, seems to be our main problem."
-ae
#8
How do the new tubes sound, despite the rattling?

It could be something going inside of the chassis. A loose connection perhaps?
Call me Wes.
Gear:
Fender American Deluxe HSS Strat
Chicago Blues Box Roadhouse
Bad Cat Cougar 5
1957 Gibson GA-5
Ceriatone 18w TMB Combo
Hughes & Kettner Tube Factor
Various Ibanez TS9s
Weber MASS Attenuator
#9
Quote by darkarbiter7
How do the new tubes sound, despite the rattling?

It could be something going inside of the chassis. A loose connection perhaps?



The tubes sound sweet at low volumes! I was about to send you a message! Good choices. Thanks so much!

I just took the amp part out of the combo part, so I'm going to try plugging it into a different speaker separate from the cab section.

And all of the tubes are basically brand new. They've all been changed within the week. I have been told to change the caps. Would they create that ugly sound though?
Winner of the 2011 Virginia Guitar Festival

Protools HD
Lynx Aurora 16/HD192
Mojave, Sennheiser, AKG, EV etc mics
Focusrite ISA828 pres
Waves Mercury
Random Rack Gear

65 Deluxe Reverb
PRS CE 22
American Standard Strat
Taylor 712
#10
I'm glad you like them.

At first I was worried because it sounded like the tubes I sent you may have made the rattling worse (in your first post)
Call me Wes.
Gear:
Fender American Deluxe HSS Strat
Chicago Blues Box Roadhouse
Bad Cat Cougar 5
1957 Gibson GA-5
Ceriatone 18w TMB Combo
Hughes & Kettner Tube Factor
Various Ibanez TS9s
Weber MASS Attenuator
#11
So here's something very interesting. I plugged my dormmates little crate practice amp into the champ husk (without the actual amplifier part. Just the housing and the speaker) and it rattled like a bitch
Winner of the 2011 Virginia Guitar Festival

Protools HD
Lynx Aurora 16/HD192
Mojave, Sennheiser, AKG, EV etc mics
Focusrite ISA828 pres
Waves Mercury
Random Rack Gear

65 Deluxe Reverb
PRS CE 22
American Standard Strat
Taylor 712
#12
Hmm...

It's probably something in the cabinet then. Perhaps the frequencies of certain notes sets it off?
Make sure everything is screwed down, first off.
Call me Wes.
Gear:
Fender American Deluxe HSS Strat
Chicago Blues Box Roadhouse
Bad Cat Cougar 5
1957 Gibson GA-5
Ceriatone 18w TMB Combo
Hughes & Kettner Tube Factor
Various Ibanez TS9s
Weber MASS Attenuator
#13
Quote by darkarbiter7
Hmm...

It's probably something in the cabinet then. Perhaps the frequencies of certain notes sets it off?
Make sure everything is screwed down, first off.



I just went and jacked a guys cab for his matchless. Same bloody problem. There's no doubt PART of the problem is my cabinet but what would old caps sound like? I'm starting to feel like that's one of my only remaining options. It may be the speaker, but I've tested it with other speakers, it may be the cab but I've tested it with other cabs, it wasn't the tubes, I mean, what is left?
Winner of the 2011 Virginia Guitar Festival

Protools HD
Lynx Aurora 16/HD192
Mojave, Sennheiser, AKG, EV etc mics
Focusrite ISA828 pres
Waves Mercury
Random Rack Gear

65 Deluxe Reverb
PRS CE 22
American Standard Strat
Taylor 712
Last edited by Artemis Entreri at Oct 30, 2009,
#14
bad filter caps would make ragged sounds, they charge up and release there voltage, does something that is over my head. but if they aren't charging right and release at odd times it can make the amp sound off or keep it from playing altogether. they only usually cost a few bucks, a full on cap job is like 50 to 100 usd.

edit
http://www.andrewsamplab.com/Cap.htm
punk isn't dead, it's always smelled that way.

"A perfection of means, and confusion of aims, seems to be our main problem."
-ae
Last edited by gumbilicious at Oct 30, 2009,