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Humming In Standby Mode

dt 50 sound

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#1 casparello

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Posted 12 May 2013 - 05:53 AM

Why is my DT 50 humming in standby mode? Yes, I know its a tube amp ... but this constant humming is really something. Wow!


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#2 BigChas52

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Posted 12 May 2013 - 06:45 AM

Could be a problem with the amp, but sometimes an amp will not play nicely with the electricity in your house, or at a particular venue, thus resulting in hum or buzz.  Sometimes an amp will not play nicely with another device on the same circuit that is causing electrical interference.  Have you tried the ground-lift switch?  Have you tried different outlets in different parts of your house?  Have you tried it in another house or place? 


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#3 toneman2121

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Posted 12 May 2013 - 07:21 AM

i think you should have little to no noise in stby. did this happen gradually or suddenly? is the noise present when the amp is on? when did you buy it?


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#4 geppert

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Posted 12 May 2013 - 09:00 AM

Not that this is the answer to your specific current problem (and it shouldn't be humming in standby mode) but I ALWAYS use an AVR whenever I play anywhere including home. I followed another member's (Spaceati) advice and got the Tripp-Lite LC1200. Killer. Never have a hum, never have a problem. As Space also mentioned in one of his posts, these amps are like little CPU's with power tubes .... they can be very susceptible to line voltage fluctuations and bad grounding. Let us know if you figure out the problem. Curious.


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#5 spaceatl

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Posted 13 May 2013 - 11:33 AM

wassup fellas...+1 geppert...AVR...Never run gear without it...That lack of hum is just one of those isolation benefits of putting a tranny on your input power...


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#6 casparello

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Posted 15 May 2013 - 04:36 AM

Thanx again everybody for your support,

 

AVR -> shure thing. I use a Furman M-10 E

 

But none of your suggestions really turned out to help my DT 50 (built August 2010).

I just sent it back to Line6/ my dealer (www.thomann.eu) to have this fixed. Hopefully the amp is back soon. 
I like the DT so much. The only thing thats missing is an already built locker to protect the amp against unauthorized use.

 

I´ll keep you posted.


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#7 spaceatl

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Posted 15 May 2013 - 09:46 AM

Furman M-10 is NOT an AVR...conditioner only...You have never had the benefits of an AVR with that device. just surge protection and some filtering...Zero Isolation.

 

Furman AVRs generally have AR in the model...and they cost 2-4 times what the conditioners cost.

 

 

120v http://www.furmansou...v=01&id=AR-1215

 

240v http://www.furmansou...03&id=P-1400ARE


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#8 casparello

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Posted 16 May 2013 - 11:11 AM

http://www.furmansou...=03&id=AC-210AE :-)) 

 

Can be placed in the back of the combo :-)

 

I can´t see the benefit of the AVRs (extra: isolation) in EU with constant 240v all over the place. 

Maybe it´s good to have in the US where chances are high not to get solid 120v ...


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#9 bribrew1968

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Posted 24 May 2013 - 09:25 AM

I had horrible humming from my DT50 212.  Turned out to be the power strip.  Changed to another wall outlet and it was fixed.  In standby I never had the issue.  Hopefully they can fix your amp ... these are sweet amps .... best of luck!


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#10 Rowbi

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Posted 01 June 2013 - 10:52 PM

I've had several Marshalls and my 6505+ all hum on occasion when in standby, and its usually caused by shoddy power quality in nasty gig venues.

But if it happens all the time in outlets that don't cause other amps to hum, then it may be a fault though.

Just wanted to suggest that in case you don't have an AVR to hand, but they're a good long term investment if you value your gear.

Cheers

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#11 thatoneguy759

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Posted 02 June 2013 - 08:46 AM

would a ups work too?


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#12 lef38

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Posted 03 June 2013 - 04:47 AM

I had the same problem and fixed it with this voltage regulator:

http://www.infosec-u...rs/r1-1200.html

(seems to be distributed in France only)


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#13 casparello

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Posted 24 June 2013 - 01:03 AM

I've had several Marshalls and my 6505+ all hum on occasion when in standby, and its usually caused by shoddy power quality in nasty gig venues.

But if it happens all the time in outlets that don't cause other amps to hum, then it may be a fault though.

Just wanted to suggest that in case you don't have an AVR to hand, but they're a good long term investment if you value your gear.

Cheers

Rowbi

 

hey rowbi, 

 

good advice for the power supply network in the us 

over in europe you get constant power supply everywhere.


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#14 casparello

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Posted 24 June 2013 - 01:24 AM

The journey continues: I sent the humming amp back in may. Line6 in Germany decided without notice to change the tubes, they checked the amp and returned it. I was surprised that they charged me for this.  

I went for a testdrive right that evening (... amp still humming like I sent it ...) and just five minutes later the amp started humming louder and louder and ... vaporized. Wow! :mellow:  

 

I returned the amp the next day.


Line6 told me: "The amp has been tested and checked before return. 
We can fix it again but the amp is not in the two years warranty any longer so it´s not a Line6 problem."

 

(...)

 

I assume they checked the amp and switched channel A and B while playing. But when you have a HD500 connected (via L6) the reconfigurable analog components (Class A/Class AB; Pentode/Triode) do change too.
I wonder if they checked on this as well and maybe thats exactly why the amp broke down.
Or do I have one of these DT50s that explode?


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#15 toneman2121

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Posted 24 June 2013 - 01:44 AM

is the amp still humming? i think the transformer was going bad and finally fried. 


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#16 casparello

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Posted 24 June 2013 - 06:41 AM

is the amp still humming? i think the transformer was going bad and finally fried. 

 

yes


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#17 Rowbi

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Posted 24 June 2013 - 11:56 AM

hey rowbi, 

 

good advice for the power supply network in the us 

over in europe you get constant power supply everywhere.

 

not in the UK part of Europe, which is where I am...   we invented shoddy power :-)


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#18 simbo

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Posted 06 July 2013 - 01:27 AM

Hi casparello, Just out of interest did you by any chance get a thump through the cab or speaker when changing patches and a bit of interference.

 

simbo 


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#19 casparello

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Posted 08 July 2013 - 01:00 AM

@ simbo

 

if you mean that I hear a small audible impact when changing patches -> yes


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#20 jrose92081

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Posted 17 July 2013 - 12:20 AM

I have the same issue it seems. I was playing straight into the amp (without HD500) and as I was turning up the volume I got a loss in power and a bad hum. I reset the amp and turned it back on, same issue but noticed a pop when i took it out of standby. Now the amp has very little power and is very dirty. Even voicing 1 is really dirty even with the drive at 1 in full power mode. Class A seems to have a louder hum. I had the tubes changed and the amp biased and same results. I even re-installed the firmware. I love this amp and the fact that it is a paper weight breaks my heart. I have it narrowed down to the processing board or the transformer. Any help would be much appreciated.


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