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Posts posted by Brazzy

  1. I take it the tubes life is determined by the amount of time put on them, also how hot they run has a detrimental affect. I read in the forum archives that someone with a DT25 had this problem and it was that 12AX7 tube, but they went and did all the tubes. I'm gearing up to be able to service the tubes in my DT50 Head by getting a Bias testing tool and spare tubes. It was suggested that I get a Quartet of power tubes and set the amp up to run them so in case I have a problem I should be able to just exchange power tubes and the bias would ok, but I'm going to check that out later when I finally get what I need. Also I need to have spare fuses. These are fairly easy things to fix on the fly if you get yourself set-up right. When you run an amp with tubes in it you have to expect to do maintenance. I also heard that after about 2 years expect tube failures although I don't know how many hours of actual playing causes them to deteriorate and then there's the chance of the tube just being bad quality.


    I forgot to mention you may need to re-flash the firmware. Also you could try resetting it. See the picture attached.






    • A MIDI interface that connects to your computer via USB (download the current Driver for it if you don't have it installed)
    • 2 MIDI cables (or a MIDI interface such as the M-Audio Uno that comes with attached MIDI cables)

    NOTE: Line 6 recommends a name brand USB to MIDI interface produced by an audio company that supports/updates their drivers. Good choices include: M-Audio, Edirol, E-Mu and MOTU. These interfaces have proven to be more robust and reliable when it comes to large MIDI transfers such as the DT25 and DT50 update.

    • Latest version of Line 6 Monkey installed. Download and install the Line 6 Monkey software here.


    • Connect your MIDI interface to your computer via USB cable.
    • Connect the DT25/DT50 MIDI Out to your MIDI interface In, and connect the DT25/DT50 MIDI In to your MIDI interface Out.
    • Launch the Line 6 Monkey with the DT25/DT50 connected via the MIDI interface and powered on.
    • Select the Flash Memory line item and click the Update Selection button to install the flash memory update into the DT25/DT50.
    • The device will receive the firmware data and the unit will be updated to the latest Firmware.

    ***If the firmware update fails and you are having trouble reconnecting to Line 6 Monkey, please try putting the unit into SAFE MODE before starting up and connecting to the Line 6 Monkey software. To do this, hold the channel select switch down to 'Channel B' and power on the DT amplifier while holding this switch down. Let go of the switch after 10 seconds or so, then re-start Line 6 Monkey and follow the steps above to update/re-install the flash memory.                                                                                                                                                                                                                                                                                                                                                                                                        

  2. I just tried playing with my master up around 25% and adjusted my channel volume accordingly rather than channel at 100% and adjusting master which I always did with my Spider II back in the day.


    Did I just stumble on something? Is there a trick to the ratio between master and channel?

    Have you tried setting all but the drive to 12 O'clock with no effects except reverb set where you can just hear it. Then increasing the drive till you just get distortion. At this point you can play around with the tone stack to see what it does to the tone. Everyone has there little system of making settings. I guess what I'm gett'in at is in time you'll have your "Base Settings" so to speak.

  3. When I was learning how to play guitar and use these Line 6 devices I would frequent this site to learn about things I didn't even have yet, LOL. Nick was one of those guys that wrote posts I would read and learn from. He wasn't the only one that taught me without knowing me though, there are plenty of knowledgeable people floating around here and I thank each and every one of them here and now. I still have a lot to learn, but You all have helped me greatly.


    +1 for quoting the great Nick Mattocks.

    His disposition and exposition is missed.

    • Upvote 1
  4. looks like you got both in the picture. The other is a 5A 250V slo blo below the plug. That's the one that blew when one of my power tubes went south.


        Oh, I missed that one, glad you mentioned that. I was just reading an old post about the DT50 Tubes>> Here


    I found this part interesting;

        "The two 12AX7 tubes are part of the power amp stage and not the pre-amp stage.  There are no tubes in the pre-amp stage,  One of the tubes brings the level from the solid state pre-amp stage up to that required to drive the power tubes and the other 12AX7 is an inverter."



    Interesting old threads

    Re: Another DT50 question

    by Nick_Mattocks

    on 2011-06-21 14:36:39


    Bias is adjustable when the amp is running class A/B mode but not when running in Class A mode as I understand it.  There are bias adjustment pots and test points inside.


    I don't know of anyone who has tried KT77s in their DT50.  I'm still on the original EL34s as fitted at the factory.


    Pin for pin the KT77s are a match for EL34s.  However, even with EL34s there's a whole range of different spec valves available.   I wouldn't like to recommend that you try any other valve type than that which is already fitted - yes a different brand for sure if you wish, but the electrical specification should be the same as what's fitted to ensure that damage doesn't occur to your amp - particularly with respect to the output transformer.


    You'd need to pose your query specifically as a question and you may get a response from Line 6 Customer Support who will be able to check out your question out with the people who will know whether you will be safe to try a pair of KT77 tubes


    The two 12AX7 tubes are part of the power amp stage and not the pre-amp stage.  There are no tubes in the pre-amp stage,  One of the tubes brings the level from the solid state pre-amp stage up to that required to drive the power tubes and the other 12AX7 is an inverter




    • Upvote 1
  5. The fuse ratings are on the back of the amp near the fuse holders. There is potential for a failed tube to damage an amp, but you really just have to trust that the fuse will blow before damage can occur.


    Hey Thanks, I just took a look and took a picture so I don't have to move this Beast of an Amp Head again anytime too soon, LOL. Looks like it reads "T1.0AL / 250 V Slo-Blo Fuse".

  6.     I use preamps most of the time 'cause they sound fine when running the HD500 directly into the front of either my Spider Jam or DT50 Head & JCA12+ Cabinet. I always set the Spider Jam or DT50 to a clean setting with the Master Volume at about 12 O'clock this way I'm hearing the HD500 preamps along with the power section of the Spider Jam or DT50 or whatever Power Amp/Speaker combo I'm using.


        Lately when using the DT50 Head & JCA12+ Cabinet I set the HD500 to Stack Front, the PAD/Normal switch set to PAD, the 1/4" out switch set to AMP (I haven't used the "Line" setting), I keep the Master set full open. Usually the Volume knob is full open and I set the Drive to add dirt.


        When I use the Spider Jam I keep all the same settings of the HD500 and just switch from Stack Front to Combo Front. Seems to work for me. Also I usually always go with the No Cab setting. I'm trying different settings but for now this is my base settings until I try more.


        As for the Full Amp Models I always use them when I run directly into a PA or a Speaker System such as a Surround Sound Home Theater, a Flat screen TV Speaker System, or a small speaker like a JAMBOX or the like. These kinds of speaker systems don't have a Power Tube Section like a tube amp so the Full Amp Model emulates the power tube sound. Also, I always use Studio Direct into PA or direct recording.

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