Loud pop noise

[Cuterd 0]

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..

[psarkissian 316]

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.

 

[Cuterd 0]

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..)

[oscarguitar 6]

Oh dear, take cover. Probably need a valve change back to the EH originals and a re-bias. Plenty of threads on here about the subject. The DT 25 will pop when changing to Class A but generally if the valves are good it's a pretty quiet amp.

[psarkissian 316]

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.

 

[Cuterd 0]

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..)

[psarkissian 316]

Take it to an authorized service center in your area, they can take of all of that. 

 

http://line6.com/find/service_center/ 

 

 

[Cuterd 0]

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?

[psarkissian 316]

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/

 

[oscarguitar 6]

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.

[psarkissian 316]

There is no factory reset on that amp.

It can be re-Flashed thru Line 6 monkey.

 

However, here, this is a hardware issue that won't be solved with software and programming.

 

[Cuterd 0]

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

[Cuterd 0]

Well i found that there is a factory reset on the amp, u turn the power on and simultaneously press the voices down and the triode/pentode up for 15 sec. Until voicing 1 apears lit. (Dont touch the standby)

 

http://line6.com/support/manuals/dt50212/

 

As it says on the dt amplifier midi implementation guide

[psarkissian 316]

Cool.

Forgot that was there, I've never had to use it myself.

 

[oscarguitar 6]

That's the one. Same as DT 25 but I wasn't sure about the DT50.