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Loud pop noise


Cuterd
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Hello, today i was practicing at low volume and jumped out of my bench when i heard a loud pop sound coming from the speakers(?), i tested every switch after i heard it, everything seems to works, power valves seem ok, the amp seems to be working fine... But it can't be nothing right? Help?

Im kinda worried, spent my savings on the amp secound hand and i don't want to brake it..

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When was the last time the valves were changed out?

Can you see the markings on the valves and tell me what brand they are?

 

Valves need to be changed out and biased once every 18 to 24 months, depending on how

much use it gets. And should be done by an authorized service center who knows the product.

 

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Ithe amp has been in my hands for 2 weeks now but the previous owner said he changed the valves arround a year back (when the power transformer died and he sent to line6 to get it fixed) but he said he didnt play much after that.. he probably did the bias himself, the power valves are jj brand and the bias is T1.0Al (if im checking the right thing..)

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Get those JJ's out, it may be part of the reason for the transformer failure in the first

place. Use the specified Electro-Harmonix. Take it to a Line 6 authorized service center

to have the valves change and biased, and the fuses checked for the correct values.

 

These amps are not forgiving of alterations or modifications,... that includes valves.

These are not the all analog valve amps of the 1960's and 70's.

 

Amps that come back to me for repair with other than specified valves, failed because

they had something other than specified valves in them,... and incorrectly biased.

Take it to a Line 6 authorized service center.

 

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Oh right, i forgot to mention that it's a dt50 1x12 combo...

Where can i get the original valves, how much will it cost to swap them?

Well, the pop sound happened while i was playing so I wasn't messing with the controls, i would say the amp is pretty quiet, there is a low hum that you cannot hear while playing (that hum turns insane with the volume and master full power, but I'm a bedroom player) and there is a tickling of the valves when powered off, that i read was normal (its my first valve amp..)

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Ok ill do that, how much should i expect to pay?

 

Since im here, the amp has one problem that i noticed when my friend bought him self one too (he got blown away by the sound quality), i noticed my A and B channels dont sound the same, for instance the A channel in the voicing IV sounds as clean as it gets and as metal as it gets on the B channel, in his dt50 it sounds the exact same.. Should i be worried, is it an easy fix?

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Check with the service center for an estimate on that. Hard to tell with a second or third hand

product, and I don't have the entire service history available to me, so I can't look that up. I have

access to service histories local to me.

 

A & B should sound close to being alike, so you can set each one for different tones and go

back and forth between them. All that would be in the manual.

 

http://line6.com/support/manuals/

 

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Try a reset. If the amp was used when you got it, there could be some old settings stored. I'm not sure how to do that on a DT50.

And a 50 as a bedroom amp! Unless you blow the doors off you will never hear how good that amp can sound. I Gig regularly with a DT25 combo and extension cab and rarely get it in the sweet spot above 50% master volume. But it sounds stunning when I do.

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I think he is referring to my problem with channel A and B sounding completely diferente, and i think he's right from what have been reading the amp can be programed to have 8 different amps, altho i dont know how to do it... The did have a pod hd 500 for a time and I'm thinking he left the amp like this with it.. Might be wrong.

 

Idk, to me it sounds stunning at bedroom lv x)

 

i read the warnings on the dt50 manual and it didn't warn about changing the valves from time to time or to keep the factory brand, but i will change it back when i can afford to buy the old ones and send the amp to line 6.. I guess ill play it as little as possible untill then

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  • 2 years later...

The DT25 head I own has been performing well for several years now.  I have not changed any tubes.  Yesterday while playing a loud pop was heard following by no sound and no power.  The fuse was verify to be still in god condition as no discoloration.

 

What would you believe to be the problem?

1) Total tube replacement

2) Power Issue?

3) Other

 

  

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Any one of the three. Should be taken in to your nearest L6 authorized service.

Start with checking the power, and the transformers, then change out the tubes.

 

There is a calibration and test check procedure, post tube change out check list. Have  L6 authorized do it.

 

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  • 1 year later...

I just had my DT50 upgraded with a Mercury Magnetics transformer (shout out Bell Audio Lab)  and was experiencing a similar pop not long after getting it back. I just tried the reset and seems to have done the trick. I can’t recall what amp settings I updated back when I set this up, but am not too keen on the idea of overhauling my rig after the MM install. As much as part of me would love to go full Helix or Quad Cortex, my 2/3 Dream Rig has been such a fun setup to run (even if I’m only playing 50 watts at home).

 

Next up is trying the 4CM + Helix Stomp… very intrigued

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If it's during power on or power off, then it would be a filter cap discharge cycle, also known as

the RC time constant. Might not be as well matched to the transformer as it could be.

 

How long since the tubes were swapped out last?

 

Are they the specified tubes and bias?

Tubes choices to use for the DT Series,...

DT-50 Series:

12AX7EH Electro-Harmonix approved for the DT50 pre-amps.

EL34EH Electro-Harmonix (matched pairs) for the power amps.

DT-25 Series:

12AX7B China for pre-amps.

EL84EH Electro-Harmonix (matched pairs) for the power amps.

Power amp tube choices are crucial, and must be properly biased by a tech or Line 6 authorized service center who knows the product.

Don't do this yourself, the shock hazard is too great,... and it hurts when you get electric shock. Leave it to a tech trained who is for this.

These valve amps are particular about tubes and tube brands. Do Not use substitutes, No Mesa, Groove Tube, Tung-Sol or JJ or (etc) substitutes. No hot rodding of an already Bogner hot rod.

 

How often do you play it? Gigging musician (once every 12-18 months), weekend warrior (once every 20-22 months),

bedroom/closet studio rocker every couple weeks (once every 24 months)?

 

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It would happen mid play actually. Volume is usually relatively low, then the pop, then buzz (like the guitar’s unplugged) without any other sound.

 

The work was done at an L6 service center & they took care of checking/biasing the tubes too. I’ve definitely taken note of how finicky the tube tolerance is with the DT series, so I’ve been very mindful of tune replacement brands.

 

I’m definitely a home office noodler l, so I’m easily into the 24mo timeframe on tubes. It’s definitely a good thing since I want to say I’m at least 2hrs from an L6 service center since I’ve moved to NC. Since my DT was a factory refurb from about 5 years ago, I might end up going rogue and using a local shop if anything else needs to be worked on. Worst comes to worst I end up going the PowerCab route, or getting lured into Neural DSP’s territory… time shall tell 

 

thanks so much for the response and the details!

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