#1
EDIT: Turns out the 12AX7 was just broken and everything is fine, now I just hope Tube Depot will send me a new one.


So I have no idea what happened, but I decided to change the tubes in my Blackheart, it takes one EL84 (JJ) and one 12AX7 (Tung Sol). After I changed them it wouldn't produce any sound, so I took a look in the back. The pre amp tube wasn't glowing but the power tube was so I put in the old tube. The old tube lights up but now my amp still doesn't produce any sound except for a constant bassy hum. I have absolutely no idea what's going on with this thing, help?

EDIT: I tried it again with the old tube, my guitar barely comes through, but the volume knob has no effect on how loud it is and the bassy hum is still there.

Also, I haven't made any stupid moves like forgetting to plug it into the cab, plugging in the cab or plugging my guitar directly into the amp.
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Last edited by thsrayas at Oct 3, 2008,
#2
Anybody?
Quote by Vincent Vega
Haikus are awesome
but sometimes they don't make sense
Refrigerator



Quote by KissingShadows
People always tell me I solo like Zakk Wylde. Thats how I know that I suck.
#4
But why would the JJ light up and the Tung Sol wouldn't?
Quote by Vincent Vega
Haikus are awesome
but sometimes they don't make sense
Refrigerator



Quote by KissingShadows
People always tell me I solo like Zakk Wylde. Thats how I know that I suck.
#5
my preamp tubes don't always light up. Are you sure they are seated down tight? Did you replace like for like exactly? Did it need a tube change, were you losing power/sound before? I doubt it is a fuse. I don't think they need any extensive breakin time. Have you left the amp on for awhile.

Roc8995 (Colin) might have some ideas.
#6
Make sure they are seated right. If not, you aint getting jack.
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#7
biasing issue maybe?
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