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Old 07-14-2013, 10:30 PM   #1
CowpokeFromHell
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My amp (Jet City) has no bass response. Why?

So recently I got a new amp, and while comparing it to my Jet City, I've noticed a problem. When playing, it sounds as if i took the bass knob all the way to zero, or just turned the treble all the way up. It used to sound all big and boomy, but now it just sounds hollow. Is this a tube problem, or is something wrong with the bass pot? Tubes are probably a year old now.
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Old 07-14-2013, 10:37 PM   #2
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It could be a tube problem but the first thing I am thinking is that you are comparing the tone of two completely different amps. Its like comparing a Camaro to a Mustang. They have completely different tone stacks and a quick question do they even have the same power tubes?
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Old 07-14-2013, 10:57 PM   #3
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Originally Posted by Sputnik1
It could be a tube problem but the first thing I am thinking is that you are comparing the tone of two completely different amps. Its like comparing a Camaro to a Mustang. They have completely different tone stacks and a quick question do they even have the same power tubes?


I'm pretty sure the tubes are different. I haven't looked at the ones in my new amp yet though. For some reason I still feel as if my low end is missing. I remember when I got it the bass seemed a bit flabby. Now it doesn't even seem as if it's even there at all, even when the knob is cranked.
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Old 07-15-2013, 12:36 AM   #4
R45VT
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Did you buy it new or used? Any spare preamp tubes to switch in there for testing?
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Old 07-15-2013, 01:20 AM   #5
darkwolf291
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Try a tube swap man
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Old 07-15-2013, 03:36 AM   #6
GABarrie
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Stock JCA tubes are tinny and high end based. Some JJs in there will sort that out. Out of interest, what is your new amp?
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Old 07-15-2013, 01:49 PM   #7
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^ +1

and what speakers are you using?
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Old 07-15-2013, 04:51 PM   #8
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Turn it up really loud. I thought those amps always sounded thin at low volumes.
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Old 07-15-2013, 07:10 PM   #9
CowpokeFromHell
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Quote:
Originally Posted by GABarrie
Stock JCA tubes are tinny and high end based. Some JJs in there will sort that out. Out of interest, what is your new amp?


The new amp is a crate Blue Voodoo 50W Head. I found one Hammond 12ax7 from an old organ that i had sitting around in my garage. I tried it in every position, and it seems that something was wrong with the tube in V2. It also made the loudest noise with the pencil test. I might just swap all these preamp tubes out. Any recommendations? It's currently running Chinese 12 12ax7's in every position.
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Old 07-15-2013, 07:14 PM   #10
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Old 07-16-2013, 08:33 AM   #11
GABarrie
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Old 07-16-2013, 08:22 PM   #12
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The low end on the JCA100H (which is a bright amp) is very round and warm, it's not a tight or boomy amp at low volume at all. Their magical sweet tone spot is with the post gain around 5 from my experience, that's when the low end really comes alive and when the amp shines the brightest. The HDM model actually has a knob for adjusting the low end output at low/moderate volumes: Depth Knob. You can easily modify a regular JCA100H to have a depth knob, it's a very simple, non invasive mod.

The Blue Voodoo and JCA are in the same tonal vein (Marshall-esque), but they're as much alike as a 5150 is to a Dual Rec. From what I remember the BV was a darker amp with a larger bottom end, it was also noticeably fizzier than a Jet City.


To summarize: I think you're hearing the differences between the amps. I wouldn't say the Jet City has a weak bottom end, it's just voiced differently than a Blue Voodoo. In a live situation the JCA is going to cut through the mix a lot better than the BV


EDIT: What speakers are you running with each amp?
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