#1
I play through a 6505 with all jj's. The low end just recently became farty through eminence governors and man o wars in a x pattern. The speakers are not blown. I recently got a schecter hellraiser with emg 81's. Could I be due for a tube change? Tubes are almost 2years old and the amp is biased hot. Just wondering if tubes could be the problem as the low end used to be tight.
#2
Check the batteries on your EMG's.
Have you lost a bunch of volume too? Could definitely be a blown preamp tube (smaller ones.)
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#3
Ill change the battery. I have been swapping out the fx loop and phase tubes but no luck. No volume loss though. What could cause this problem? It still happens if I turn the bass down to 3 as well as the resonance...
#5
could be a tube though without the decrease in volume then its not a power amp tubes
any other changes you've made to your rig?
#6
Added an isp decimator, but the problem happened well after I added it.
Last edited by hardrckr120 at May 20, 2010,
#7
Faulty power tubes often sound crappy long before you get any volume decrease. Replace them, if it doesn't fix the problem you will have spares and that's always a good thing to have around.
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#8
Would a less focused low end be a sign of tubes starting to go bad then? My tubes usually blow and I never have a chance to get them before they do, which is why I don't know what to listen for
#9
Less focused low end, fizzy top end, lacking midrange, popping and farting, they can do anything when they start to die.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
#10
Thanks for the feedback. The tubes are a couple years old and the high end has been pissing me off too lately so I will take it in. I really need to learn how to bias myself without dying
#11
Tubes degrade over time and it's very likely that this is the case.
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#12
Definitely a power tube issue. Like Cathbard said, degrading tone and audio anomalies are signs of imminent power tube failure, long before any volume drops.
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#13
Ye the low end has always been tight and I have been happy with it, so I will have the power tubes and maybe the preamp as well just to get that tightness back