My Bad Cat is Farting

ed_dale007

Member
Messages
210
Aside from the funny title. I just noticed that my bad cat black cat is bottoming out and farting while playing low notes. I run it through a 1x12 with a v30. I havent noticed it doing this before, so I'm not sure what could be wrong. Any suggestions?
 

bettset

Member
Messages
4,183
take it to the vet.........ok jokes aside.......tubes? anything wrong with the speaker? if not, something inside may be wearing out....capacitors & such. how old is it :munch
 

Ampegasaur

Member
Messages
3,628
The thread title made me laugh. I would say check the preamp tubes first. Then check the speaker. How many watts is your farting Bad Cat.
 

TDJMB

Platinum Supporting Member
Messages
3,532
I had a Mesa Boogie that did that and it turned out to be the power tubes - that had just been purchased from Mesa Boogie.
 

ed_dale007

Member
Messages
210
LOL The tubes are just over a year old. I should probably put some new JJ's in there. Anybody tried the JJ EL84mm's? I usually buy from the tubestore.com as im in Winnipeg and they are in Hamilton so it's easy for shipping purposes. There preferred 7189 series looks good but I dont know if they will fit in my bad cat. Apparently only JJ's fit.
 

Electric I

Member
Messages
3,407
Suuuuure...blame it on the cat... ;)

'Nother vote for a tube swap. The tubestore is as good a place as any. Good luck.
 

sixstring531

Silver Supporting Member
Messages
3,199
Check the tubes - My Black Cat runs super, super hot. (like an el84 amp should!). I've had excellent luck with thetubestore.com and tubedepot.com. I usually do the depot because the shipping is slightly cheaper. I have only ever used JJs in my BC.
 

tele_jas

Member
Messages
3,762
My old Marshall 1974x clone was farting out on low notes.... I tried everything I could think of to fix it. New speaker, re-wired some components to make sure it wasn't a short. Finally I changed power tubes, and that fixed my problem.

So, change your power tubes.... That's what I'm guessing.
 

FFTT

Member
Messages
28,370
Most likely power tubes, but if you want to bring out those Vox tones with
a single 12", I'd install a Fane AXA12.
 

Lance

Gold Supporting Member
Messages
10,746
Or, it could be the dreaded V30 cone cry. If it's still doing it after you have swapped tubes, closely inspect the speaker.
 

Guinness Lad

Member
Messages
15,862
$2000.00 Amp through a $20.00 Chinese knockoff speaker.
Not really, but believe what you will.

Most likely it's worn tubes. My Matchless can get a little rubber down there, they tend to put out a lot o flows, perhaps too much for a 1x12. Dial back the bas so it just turns on and adjust everything else so it's not too bright.
 

FFTT

Member
Messages
28,370
Not really, but believe what you will.

Most likely it's worn tubes. My Matchless can get a little rubber down there, they tend to put out a lot o flows, perhaps too much for a 1x12. Dial back the bas so it just turns on and adjust everything else so it's not too bright.
It's not a matter of belief, but experience.

Most likely the power tubes are weak from overheating, but no matter
how manufacturers attempt to spin their selection of a Vintage 30,
it's just a basic, "good enough" OEM speaker, ordered by the pallet load.

Yes, you can certainly voice the amp so it doesn't sound like complete crap
through these Chinese profit makers, but these fine amps deserve a much
better speaker and certainly deserve better quality tubes.

It's natural for most buyers to want a matching cab to go with their amp,
but honestly, looking at budgets and a highly competitive market,
how many matching cabs would you be able to sell if they were pre loaded
with $800.00 - $1200.00 worth of upgrade speakers?
 
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Guinness Lad

Member
Messages
15,862
So I guess Matchless is doing the same thing then, give me a break.

I'm not a fan either but what options do these guys really have? They are not going to put Scumbacks' in the amps, most people have no idea what a Scumback, ASW or some other small time maker is, they need to go with known suppliers.
 
Messages
2,606
I love those cheap speakers, but then, I have poor taste I guess. You could try an eq pedal and see if you can remove the flub by cutting. That might help to tell you were its coming from.
 

Rod

Tone is Paramount
Gold Supporting Member
Messages
22,087
Bad Cat amps are very hard on power tubes. Replace the EL84's. I like the tone of the Sovtek's. They have a warmer high end than the JJ's
 




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