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Post subject: DeVille 410 buzz
Posted: Mon Aug 24, 2009 3:50 pm
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I recently bought a used Hot Rod DeVille 410 and I tested it out a few times (at pretty low volumes) before I bought it and it sounded great. I've had it for about a month now and I've used it for a few shows (where it has been at pretty low volumes with an amp mic in front of it) and it's been fine.
I have been trying it out at higher volumes and I've been getting a lot of buzz, especially when the lows are turned up.
I know that the former owner replaced the tubes about two years ago and since that time it's been pretty much collecting dust.
Could this be a blown speaker?


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Posted: Mon Aug 24, 2009 5:35 pm
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Its possible that it may be a speaker.

Check the tubes are all in correctly and that it is biased too.
Also try it through different sockets in different places.

If alls well wi those then take it to a tech.

CC

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Posted: Mon Aug 24, 2009 9:37 pm
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Hi Jhkc, can you try another speaker or speaker cab? Any good 8ohm speaker rated for 150watts or more should give you an idea about that noise. But Celtic is right about trying all the input sockets(and guitar cord) and controls. If the amp is otherwise quiet at high volume, I would first suspect dirty pots,jacks, or tube sockets(especially if you're confident that the power tubes are quality-low hour tubes). Good Luck,ART


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Posted: Sat Aug 29, 2009 6:39 am
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To properly verify that the tubes are either good, bad or weak follow these steps:
Remove power tube closest to Standby switch. Set volume levels to 3. Turn amp on. Now switch the amp to Standby.Depress bright switch. Listen for noise. Now depress More Drive. If noise is still present turn off Standby. Repeat these steps. If noise is still present then that tube is not causing the buzz. Turn amp off, replace tube to it's proper location then repeat the process with each tube. It is safe to turn the amp on even though one tube is not in position. Clean the metallic pins with contact cleaner as you go along. These steps will always help you isolate a questionable tube regardless of amp manufacturer. The tubes may or may not be the issue, so if you are satified with your current sound replace the tubes with the same configuration. Have the amp biased, because at this point only the tech can evaluate the current bias setting. I own the same model amp so I've installed 2 Mesa 6L6 STR-440 and 3 Gold Series GT 12AX7-R.

Keith


Last edited by keithamatthews on Fri Sep 04, 2009 5:04 pm, edited 1 time in total.

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Post subject: noise
Posted: Sat Aug 29, 2009 10:50 am
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Hi there, what kind of buzz are you refering to. Is it when you are really pumping the volume and you get a rumbeling buzz. You are wondering if it could be the speaker so I assume that is the kind of rumble you mean. I have also found that my amp has a similar problem. The cabinet is partly guilty of this. I checked the screws that hold the speakers and the cabinet together and I found most of them to be loose. After tightening the screws this helped a great deal. The lower back panel was also making some noise before tightening the screws.

I read in the following article that the speaker/cabinet combination causes some of the bass rumble (buzz). I also performed the mod to the circuit and it does help reduce the bass rumble. But like it says in the article it also affects the drive channel.

http://studentweb.eku.edu/justin_holton ... .html#bass

I hope this helps,

Allan


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