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Post by ewhelan on Mar 25, 2005 13:03:39 GMT -5
Hi Jerry,
I just found your site and I am thrilled to see some tech info on the 5150 Combos. I have been looking forever for this it seems. I have been having a few problems with my 5150 Combo and I'm hoping you guys can offer some assistance.
When I tap on the plastic air grate on the top of the amp, I can hear a pinging through the speakers. Is this normal? Also, I find that the amp is really thin sounding and I would like to change that.
I'm proficient with a soldering iron (to the point that I have actually soldered pins back on a broken P4 processor) and I know a little about electronics.
Thanks for any help or suggestions you can offer.
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Post by Jerry P on Mar 27, 2005 11:03:31 GMT -5
Sounds like you have a microphonic tube. Try tapping on the 12AX7 tubes and see if you can figure out which one it is. Jerry
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Post by ewhelan on Mar 29, 2005 16:22:52 GMT -5
It was a microphonic tube. I'm amazed at what kind of negative effect one bad tube can have on an amp. Thanks Jerry! Now I might sell it.....and buy a boogie
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Post by Jerry P on Mar 29, 2005 16:35:12 GMT -5
Now I might sell it.....and buy a boogie Oh man that hurt! Jerry
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Post by ewhelan on Mar 29, 2005 23:31:57 GMT -5
Sorry Jerry, I'm at my wits end trying to get a good sound out of this amp. I can't seem to get anything I like out of it. I find it has WAY to much midrange....and the bass not tight at all....and when you turn it down it gets too thin. I hate the gain in the lead channel......really buzzy I just think I would be happier with a different amp.
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Post by Jerry P on Mar 30, 2005 7:23:39 GMT -5
Sorry Jerry, I'm at my wits end trying to get a good sound out of this amp. I can't seem to get anything I like out of it. I find it has WAY to much midrange....and the bass not tight at all....and when you turn it down it gets too thin. I hate the gain in the lead channel......really buzzy I just think I would be happier with a different amp. I was just messing with you, the Mesa's sound good. I personally hate the 5150 combo. It sounds nothing like the 5150 head IMO. Jerry
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Post by ewhelan on Mar 30, 2005 14:44:55 GMT -5
I went through the "perhaps a mod will fix it" phase and I searched high and low for some documented 5150 Combo mods....but 99% of the mods out there are for the head which is a different circuit.
Then I realized that, even though a mod might change it, it probably wouldn't change it enuff for me to like it.
It's sad.
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