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No Sound Coming Out Of Dt50 Head/cab

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#1 dgulli

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Posted 16 November 2013 - 11:26 PM

Hi All,

 

Love my DT50 Head and Cab combo. i use it in conjunction with the HD500 for gigs and so far i've been really happy with it. Except today! basically i set it all up as normal, and i found no sound was coming out of the amp.

 

Having a look at it, i took the HD500 out of the equation and plugged in directly to the amp.. then changed the guitar, the lead, and the speaker cable, and still no sound :/ mind you, the DT50 lights up to show it has power, but it also appears that the valves at the back arent warming up.

 

- I've also checked the fuse next to the power input and that appears to be fine. 

 

I'm not sure if its just a valve replacement that needs to happen here or whether there is a bigger problem.. any tips/troubleshooting i can take?  if one valve goes out of the 2 power amp ones and 2 preamp ones, does this lead to problems like this? or can it run off 3/4 rather than the full 4/4?

 

 


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#2 AndyParedes

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Posted 17 November 2013 - 08:25 AM

A couple things you can check:

 

reflash the DT firmware: always a good call to ensure there isn't something corrupted in the software. 

 

http://line6.com/sup...structions-r120

 

Speaker cabling - be sure things are plugged in, even try a different speaker cable out to a different cab would be a good call to ensure there isn't something wrong with the speaker connection.

 

preamp tubes: these can be changed without biasing.  the two preamp tubes in the DT50 act as a booster and phase inverter, so if either of these are "bad" that could be the root of the problem.  Any quality 12AX7 will work for this application.

 

Power amp tubes: these need to be replaced/biased by someone with experience, as there are a number of potential problem areas for the "inexperienced".  When in doubt, take it to a Line 6 service center.


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Regards,
Andy

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#3 dgulli

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Posted 19 November 2013 - 03:32 PM

Hey,

 

I've never actually flashed the firmware of the DT50 Head -  what is strange is i did flash the HD500 the day before this all went pear shaped. but the problem exists even with the HD500 not even in the equation.

 

I Changed speaker cabling with the other guitarist who has a Spyder IV and it had no affect, i wish this was the issue.

 

Preamp Tubes - Ok cool, i can see these are pretty easy to remove and put back in. neither of these were lighting up, and i have noticed there seems to be a black smokey looking ring on the inside between the metal and the glass.. normal? 

 

Power amp tubes - Yeah, these looked like serious bad boys.

 

Thanks for the help, i'll post an update asap.


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#4 dgulli

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Posted 19 November 2013 - 05:44 PM

Ok update

 

1 - Firmware: Updated the firmware to 2.00 successfully!

2- changed the speaker cable, just to be sure. no joy.

3 - Changed the preamp tubes - No joy, the tubes arent actually warming up or glowing...

 

 

So after trying these things.. no joy :/ whats annoying is it seems the only australian service centre is in sydney. And i'm in melbourne, which is in a completly different state. is there some kind of melbourne service center?!


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#5 Brazzy

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Posted 19 November 2013 - 06:26 PM

Hey thanks for sharing what you have so far. Are you looking into dealing with the power tubes yourself?


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#6 stumblinman

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Posted 22 November 2013 - 10:05 AM

There are two fuses. One below the power plug and a smaller round fixture labeled tube protection fuse. Have you checked both? I'm guessing the smaller round fuse blew. This is generally a sign of a bad power tube.
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