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05-17-2010, 11:46 PM
| | Registered User | | Join Date: Oct 2008 Location: Bombay, India | | | Mesa Bass 400 LED Brightness
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I followed the schematic to rewire my Mesa to work on 230v and changed the fuse to 3A slo blo..
Now I dont know how bright that blue LED is supposed to be but mine is really really dim. Is there a Safe way to brighten it...?? Like change a resistor to a lesser value..??
Has anyone else faced this problem..?? |
05-18-2010, 10:44 AM
|  | Registered User | | Join Date: Aug 2007 Location: Toronto Ontario Canada | | | If you did the change correctly there should be no change in operating conditions for the amp. Recheck your wiring.
Paul |
05-18-2010, 12:49 PM
| | Registered User | | Join Date: Oct 2008 Location: Bombay, India | | | Im pretty sure the change in voltage was done correctly, it was just to rewire one jumper on the board..And my tech did it who im sure knows his ****..
The amp works perfectly but i have no clue how bright that light is in the US..But i need it much brighter than what it is for sure..!! |
05-18-2010, 12:53 PM
| | Registered User | | Join Date: Sep 2005 Location: purgatory | | | mine was always on a low flicker.
has nothing to do with performance, as far as I know.
just be glad you have the amp, don't sweat the small stuff.
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05-19-2010, 10:43 AM
| | Registered User | | Join Date: Oct 2008 Location: Bombay, India | | | Im glad I have the amp but once both my switches were on without me knowing and the sound check was in the day, so when i plugged it in, it was actually ON..!! luckily at least the cab was connected..
I just want it to be brighter, isn't there a safe way..??
I guess the value of the resistor going to the LED depends on the voltage supplied..so if i changed my mains voltage, I think that resistor value should change too..
Any more thoughts..No one else faced this problem..?? |
05-19-2010, 10:47 AM
| | | | This is funny because I've heard a lot of people complain about the high brightness of blue LEDs on electronic equipment. Some have put a piece of black electical tape over them because they were so annoying. |
05-19-2010, 11:46 AM
| | Registered User
pedal / amps - MAMMOTHsound | | Join Date: Apr 2009 Location: sheffield, uk | | Quote:
Originally Posted by suraj  Im glad I have the amp but once both my switches were on without me knowing and the sound check was in the day, so when i plugged it in, it was actually ON..!! luckily at least the cab was connected..
I just want it to be brighter, isn't there a safe way..??
I guess the value of the resistor going to the LED depends on the voltage supplied..so if i changed my mains voltage, I think that resistor value should change too..
Any more thoughts..No one else faced this problem..?? | Did you change the LED when you went from 110v to 230v?
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05-19-2010, 11:49 AM
|  | Registered Bass Offender | | Join Date: Nov 2007 Location: Cambria, CA (Central Coast) | | | A LED would normally be powered from the internal voltages of the amplifier. Those internal voltages should be the same no matter what your mains settings are.
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05-19-2010, 12:27 PM
| | Registered User | | Join Date: Sep 2009 Location: Minneapolis | | | The old Boogie LEDs i've seen remind me of a "Flicker Flame" type candle almost. They are definitely ON, but it's not as piercing as the new blue LEDs
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05-19-2010, 01:21 PM
| | Registered User | | Join Date: Oct 2008 Location: Bombay, India | | Quote:
Originally Posted by Rick Auricchio A LED would normally be powered from the internal voltages of the amplifier. Those internal voltages should be the same no matter what your mains settings are. | Ok that makes sense. So is there a LED swap or a resistor swap i can make..?? |
05-19-2010, 01:29 PM
| | Registered User | | Join Date: Dec 2009 Location: Langley, BC | | | My LED is super low on my 400+ almost not noticeable. |
05-19-2010, 01:30 PM
| | Registered User | | Join Date: Dec 2009 Location: Langley, BC | | | But I am curious what the advantage of the 3A slowblow is over the 8A. |
05-19-2010, 02:48 PM
| | Registered Bass Offender | | Join Date: Nov 2007 Location: Cambria, CA (Central Coast) | | Quote:
Originally Posted by suraj Ok that makes sense. So is there a LED swap or a resistor swap i can make..?? | There will be a resistor in series with the LED; the resistor limits current and thus brightness. A series resistor usually limits current to 10-50 milliamps. You might experiment by reducing the resistor by about 10%, then keep reducing till you get an acceptable brightness. If you reduce the value of the resistor too much, you'll burn out the LED. Quote:
Originally Posted by YL_Bass But I am curious what the advantage of the 3A slowblow is over the 8A. | At 230v the amp draws half the current that it does on 115v, so the fuse must be changed. Fuses don't sense voltage; they sense current flow.
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Last edited by Rick Auricchio : 05-19-2010 at 02:51 PM.
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05-20-2010, 03:46 AM
| | Registered User | | Join Date: Oct 2008 Location: Bombay, India | | Quote:
Originally Posted by Rick Auricchio There will be a resistor in series with the LED; the resistor limits current and thus brightness. A series resistor usually limits current to 10-50 milliamps. You might experiment by reducing the resistor by about 10%, then keep reducing till you get an acceptable brightness. If you reduce the value of the resistor too much, you'll burn out the LED.
At 230v the amp draws half the current that it does on 115v, so the fuse must be changed. Fuses don't sense voltage; they sense current flow. | This is the answer i was looking for..
Just wanted to know if it was safe, and it seems safe unless i burn the led..
Since this is a very old Led, does it make sense if I just get one of them new blue ones instead of changing the resistor..? Im sure they'll be more efficient and will be brighter than this at the same voltage it gets. |
05-20-2010, 08:50 AM
| | Registered User | | Join Date: Sep 2009 Location: Minneapolis | | Quote:
Originally Posted by suraj This is the answer i was looking for..
Just wanted to know if it was safe, and it seems safe unless i burn the led..
Since this is a very old Led, does it make sense if I just get one of them new blue ones instead of changing the resistor..? Im sure they'll be more efficient and will be brighter than this at the same voltage it gets. | Well since everyone seemed to skip by the posts from 400/400+ owners with dim LEDs; yes.
The one you have in there currently is working as intended and to get that neon blue hue you desire would be quite a drastic change in the bulb.
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- Steinbeck, East of Eden
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