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Dt-50 Head Volume Problem In Topology I Only

dt-50 volume problem

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#1 Yanitzch

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Posted 25 April 2013 - 06:50 AM

Hi!  I have been reading this forum for a long time now and now it's my first post.  So a big hello to everybody and thanks for the great infos I found so far.
 
From all the great comments I saw, I decided to buy a DT-50 head with the 412 cab.  It's been 2 months now and I can't get the good sounds you seem to have.  It's my first tube amp, so I don't really know what to expect.
 
But the real problem I have, is with topology I.  The volume is alot lower than the other topologies.  I upgraded the firmware and no changes.  I submit a ticket and they told me it's normal.
 
But I can't understand why the sound is so loud on all the other topologies and not on the first.  There is no way I can stand just in front of the cab with the volume at 12oclock in topo II, III and IV.  But in topo I, I can put the channel and master volume all the way up and it's not breaking my ears.
 
And the things that bother me the most is the volume is louder with the master volume pulled out.....  With volume knob pushed in, there is almost no change in volume level from 5 to 10...  And it's only in topo I.  In the other topologies, if I am in full 50watt operation I can wake up everyone on the street :)
 
I opened the back to check if the lamps where all seated.  I removed and reput the in place.  I saw the left EL-34 looking different than the right.  The filament is not protruding on the top, I don't know if it's ok.  And it's seems to get burn marks inside the tube.  Is it normal?  I used the amp for no more than 6-8 hours since I bought it new.
 
During operation, the right lamp (looking from the back) emit a blue haze but not the left.  This blue haze get brighter with more input from the guitar. Check the video on youtube

 
I put another video too where you can see and what I am talking about if I was not clear.  It's start in topo I with knod pulled out.  Check the volume is almost the same with knob pushed in, but only in this topo...
 
Anyway, I would appreciate if you can tell me if the amp is not operating like it should.  In that case, I would submit another ticket.
 
 
In the left tube the heater filament is a lot shorter

 
It's difficult to see, but the glow seems to be better in the right tube

 
Is this normal "burnt" marks?  This amp was on not more than 8 hours in total.

 
The left tube is weird looking, no?  Could it be only a bad tube that is causing my problem?  Or the tube got bad because of an amp trouble?
 

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#2 TheRealZap

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Posted 25 April 2013 - 07:55 AM

the topology from the front of the amp selects more than just the topology it selects the pre-amp etc...

amps get there sounds from a variety of different approaches.

the basic approach difference you are witnessing is that some amps have a loud preamp fed into a loud poweramp... and others a loud preamp into a quiet poweramp or anywhere inbetween...

 

it is normal that the settings on the front of the amp, are not suitable for every combination that exists....

so yes... if you change power amp or preamp configuration... expect to turn the knobs again...


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#3 Yanitzch

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Posted 25 April 2013 - 01:38 PM

TheRealZap, thanks for your reply. I absolutely understand that changing topologies changes a lot of things.

But I since I did not change the default amp in topology I, it should sound like a Fender Blackface Deluxe, am I right? It should act like it too, no? I just don't understand why I can't get good loud volume with the channel and master volume at max. And why the volume is about the same with pulled or pushed master volume. I thaugt pulling the knod make the amp goes from 50w to 25w, I am wrong?

Another thing, sorry for asking again, is it normal that one of the tube is scorched like that? Should I try to inverse them?

Sorry to seem so insecure. It's just I never tried the amp before buying it. And it's the first time I spend so much money on musical gear, so I want to be sure it's working like it should. We don't have big music store around here and no one care to carry great amp. I bought it online after reading so many great reviews about it. And since I own a pod hd500, I taught that it will be easy to operate.

Thanks for your time!
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#4 TheRealZap

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Posted 25 April 2013 - 01:42 PM

TheRealZap, thanks for your reply.  I absolutely understand that changing topologies changes a lot of things. 

 

But I since I did not change the default amp in topology I, it should sound like a Fender Blackface Deluxe, am I right?  It should act like it too, no?  I just don't understand why I can't get good loud volume with the channel and master volume at max.  And  why the volume is about the same with pulled or pushed master volume.  I thaugt pulling the knod make the amp goes from 50w to 25w, I am wrong?

 

Another thing, sorry for asking again, is it normal that one of the tube is scorched like that?  Should I try to inverse them?

 

Sorry to seem so insecure.  It's just I never tried the amp before buying it.  We don't have big music store around here and no one care to carry great amp.  I bought it online after reading so many great reviews about it.  And since I own a pod hd500, I taught that it will be easy to operate.

 

Thanks for your time!

 

Sorry, I skipped over some of the questions you had, the root question comes up from time to time and that's what my answer was geared towards.

 

If the volume is the same with LVM (low volume mode) engaged, then something is clearly wrong.

you shouldn't be anywhere near full volume and still be in the same room! 

i would seek out a service center: http://line6.com/service_centers/

although it certainly appears that a tube replacement would be a good idea as well.


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#5 Yanitzch

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Posted 25 April 2013 - 03:21 PM

No need to be sorry, I am know this question was asked alot... I have read them all before posting:)  I'll try to contact the nearest service center.  It's a shame since it's very far from my place and it's going to cost a bunch to send it by mail.  Oh well, thanks for you patience.  BTW, would you replace both tube to get a so-called match pair or it's just a marketing trick?


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#6 TheRealZap

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Posted 25 April 2013 - 04:00 PM

I would go with a matched set, but a good amp tech would be able to dial them in to make them work either way...

but the tubes can have their own characteristics which is why i would want a matched set.


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#7 markcockerill

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Posted 30 April 2013 - 05:58 AM

I agree, something is wrong with your amp. I have a DT50 head and 4x12. I have now configured my amp as a Soldano but prior to that (when it was new) the Topology 1 (Fender clean) would blow the garage doors off at half volume and it certainly is quieter with the master pulled out but I never use that feature.

 

Before you send it back, it might be worth a go hooking up a PodHD500 and re program the amp with midi cc. If the other topologies appear to be working as they should then there is no obvious reason that Top 1 should be behaving badly and I would not necessarily put it down to the valves. I am on the original stock valves and I gig twice a week and have done for well over a year with this amp and it still sings beautifully.

 

I programmed Soldano clean into channel 1 and Soldano Overdrive into channel 2 but I don't use my HD500 for gigging, I use a stomp board in the traditional sense though I do run chorus and delay through the amps FX loop.

 

If this does not work, sent it away for service.

 

Good luck


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#8 Yanitzch

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Posted 30 April 2013 - 04:43 PM

Hey Markcockerill, 

 

Thanks for the reply.  I loaded a Solo clean on topo 1, channel A and B.  I gives me a little more volume at the same setting (all knobs at 12'o).  But I can still put myself in front of the 4X12 with channel and master volumes at max and my nose is not bleeding :)

 

For the info, the sound is the same with master volume pulled or pushed on all topo.

 

I tried to switch the EL34'S (left for right and right for left).  Curiously, the sound is a little louder.  And more crazy, now the sound is better on topo II and IV at normal volume (knob pushed).  But I can stay in the room (execpt for topo IV !)

 

Any idea?


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#9 markcockerill

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Posted 01 May 2013 - 06:22 AM

Something is clearly very wrong. I can only advise seeking professional help with it now.

 

Best of luck


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