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    A mobo with a tube?

    A while back I remember seeing an article a motherboard that used a single tube for it's audio amplifier. I can't seem to remember the brand and I can't find anything on google. Anyone know about the board I am talking about?
    Find Nedry!


    Check the Vending machines!!

    <----Computer says I need more beer.

    #2
    Re: A mobo with a tube?

    no sorry
    http://www.digit-life.com/articles2/...ube/index.html
    nope
    http://www.neoseeker.com/Articles/Ha...aopenax4btube/
    Last edited by willawake; 08-19-2007, 01:01 PM.
    capacitor lab yachtmati techmati

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      #3
      Re: A mobo with a tube?

      Aopen AX4B-533 P4 board. I've recapped quite a few of those. A very unique board, I must say.
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        #4
        Re: A mobo with a tube?

        wow. that's something i've never seen before....
        Don't find love, let love find you. That's why its called falling in love, because you don't force yourself to fall, you just fall. - Anonymous

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          #5
          Re: A mobo with a tube?

          Thanks topcat. What kind of caps were they? Choyo?
          I wonder how bad their heat output is? How much power do you suspect is needed?
          Oh great, a closer look shows no real tube model number like you usually see in old tube sets.
          Last edited by pentium; 08-20-2007, 10:15 AM.
          Find Nedry!


          Check the Vending machines!!

          <----Computer says I need more beer.

          Comment


            #6
            Re: A mobo with a tube?

            I had forgotten about that one till you mentioned it....wouldn't have remembered who made it or what model yeah valve state MB..... ok ok I know its only for audio

            AOpen AX4B-533 Tube

            AOpen AX4GE Tube-G moederbord review

            AOpen AX4GE Tube-G another review (link) page 2 (pics there)

            TubeSound Motherboards:

            There are four new models of TubeSound enabled boards, the AX4GE-Tube, AX4PE-Tube, AX4GE Tube-G, and the AX4PE Tube-G. The PE and GE suffixes denote which version of the Intel 845 chipset is used; the GE variants feature Intel's 82845GE integrated graphics solution. The G suffix denotes the value version of the motherboard, without the extra Promise SATA/ATA133 chip onboard.
            Page1 1 link

            cheers
            You step into the Road, and if you don't keep your feet, there is no knowing where you may be swept off to." Bilbo Baggins ...

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              #7
              Re: A mobo with a tube?

              If that tube has a 100V-150V plate voltage, I'm curious how it is derived and how safety regs compliance was achieved, if it was.
              PeteS in CA

              Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
              ****************************
              To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
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                #8
                Re: A mobo with a tube?

                That was the exact same question which was coming to my mind after seeing the step up converter ;-)
                I think they had to place a isolation shield over the bottom side to accomplish this.
                May be TC can enlighten us.

                Comment


                  #9
                  Re: A mobo with a tube?

                  Same here. where's a link to the mobo manual. It should tell all.
                  Find Nedry!


                  Check the Vending machines!!

                  <----Computer says I need more beer.

                  Comment


                    #10
                    Re: A mobo with a tube?

                    One of the more daunting challenges for AOpen engineering team in developing the AX4B-533 Tube was the process of powering the tube circuitry that requires high voltage of up to 100V from the power supply to properly operate the tube. By incorporating a switching mode power supply for the tube circuitry that can truly rival solid-state amplifiers, then employing a maxim 668 DC-DC voltage converter to provide ample voltage for the tube to function under optimal conditions - correct audio playback is achieved.
                    ....
                    capacitor lab yachtmati techmati

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                      #11
                      Re: A mobo with a tube?

                      Well, from the picture i think it is showing the inductor or converter as trough whole component.
                      Thus the high voltage is unprotected without any shielding
                      At least i would not have the balls, to let the air isolate against the case..

                      Comment


                        #12
                        Re: A mobo with a tube?

                        Sorry for the late post, I just joined bad caps forum today and noticed you guys were taking about the Aopen board with the vacuum tube. Actually badcaps.net replaced my caps on mine a few years ago, and still use this board today with Vista and Intel P4 3.2ghz CPU, the audio output sound is nice when using it in conjunction with a tube amp. That's when you really here the sonics. Here's some pics of my board after finishing it up in the case.
                        http://picasaweb.google.com/ty.monro...19049134339122

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                          #13
                          Re: A mobo with a tube?

                          Was there an older replacement for the tube?
                          I have a rubbermaid tub filled with tubes.
                          Find Nedry!


                          Check the Vending machines!!

                          <----Computer says I need more beer.

                          Comment


                            #14
                            Re: A mobo with a tube?

                            The MB uses the Russian Sovtek 6922 tube which is in use today with many vacuum tube audio gear. If you have a rubbermaid tub full of these, I would suggest to eBay half of them, and save the rest for another 20, 30 years when they become very rare to buy. I'm sure you will get a pretty Canadian Penny for them.

                            Comment


                              #15
                              Re: A mobo with a tube?

                              [hijack]
                              Hey Marco, I see you are in Sacramento. I'm in Orangevale.
                              [/hijack]

                              Comment


                                #16
                                Re: A mobo with a tube?

                                Hi there bgavin, I'm actually in Antelope, but nobody knows where thats at. (:

                                Comment


                                  #17
                                  Re: A mobo with a tube?

                                  I just finished recapping my AX4B-533 Tube motherboard today. All the electrolytics 1000uf and larger were bulging and most of them had leaked. I have been using this board for years now and recently it began to require two boots to be stable. From day one, if the room temperature was below 70F, the sound drivers would not initialize. It will be this fall before I discover whether or not recapping solved this particular problem. There have been a few other issues such as the chipset heatskink falling off after one of the (soldered in) U-shaped pieces of wire holding the spring clip in place mysteriously worked loose from the board. According to a tube audio expert I know, the tube circuit has a cathode-follower arrangement, implying the designers did not wish to operate the tube toward the limits of its gain, so the tube sound effect is nice but relatively mild. Unless you know what you are listening for (and have a nice audio system to play it through) you will not notice it. Also, I found the board was mediocre at best in the capacity of <<recording>> audio, so I still use handmade custom TI C32 DSP boards with external A/D - D/A pods (on a P3-800 running Win95OSR2! Hey, don't laugh - with no bloat and no DRM it's faster than a lot of modern multi core setups running Win7!) for recording. Anyhow, to the topic at hand - recapping the AX4B-533 Tube: All of the "Leylon" caps, black and gold on the plastic sleeves, were bad. There were (5) 2200uf 16V at positions TC7,TC11,TC13,TC42 and TC43. (3) 1500uf 6.3V at positions TC5,TC16 and TC29. (5) 1000uf 6.3V at positions TC8,TC26,TC30,TC32 and TC33. The worst one was the 2200uf 16V between the 7806 regulator and the tube. Everything seems to be working correctly after the job but a little time will tell - the side cover isn't going on for a few more days at least!

                                  Comment


                                    #18
                                    Re: A mobo with a tube?

                                    Lelon are a known bad brand. It's a shame that they used bad caps on such a nice board. As for recording - it's a regular AC'97 codec after all, no wonder it gets beaten by an external D/A converter.
                                    Originally posted by PeteS in CA
                                    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                                    A working TV? How boring!

                                    Comment


                                      #19
                                      Re: A mobo with a tube?

                                      drchaos67, you still active? is the AX4b-533 still running, I found another AX4B-533 few years ago on Fleabay, same issue like my other board, all blown Lelon and Nichicon caps, going to try to recap myself this time.


                                      Originally posted by drchaos67 View Post
                                      I just finished recapping my AX4B-533 Tube motherboard today. All the electrolytics 1000uf and larger were bulging and most of them had leaked. I have been using this board for years now and recently it began to require two boots to be stable. From day one, if the room temperature was below 70F, the sound drivers would not initialize. It will be this fall before I discover whether or not recapping solved this particular problem. There have been a few other issues such as the chipset heatskink falling off after one of the (soldered in) U-shaped pieces of wire holding the spring clip in place mysteriously worked loose from the board. According to a tube audio expert I know, the tube circuit has a cathode-follower arrangement, implying the designers did not wish to operate the tube toward the limits of its gain, so the tube sound effect is nice but relatively mild. Unless you know what you are listening for (and have a nice audio system to play it through) you will not notice it. Also, I found the board was mediocre at best in the capacity of <<recording>> audio, so I still use handmade custom TI C32 DSP boards with external A/D - D/A pods (on a P3-800 running Win95OSR2! Hey, don't laugh - with no bloat and no DRM it's faster than a lot of modern multi core setups running Win7!) for recording. Anyhow, to the topic at hand - recapping the AX4B-533 Tube: All of the "Leylon" caps, black and gold on the plastic sleeves, were bad. There were (5) 2200uf 16V at positions TC7,TC11,TC13,TC42 and TC43. (3) 1500uf 6.3V at positions TC5,TC16 and TC29. (5) 1000uf 6.3V at positions TC8,TC26,TC30,TC32 and TC33. The worst one was the 2200uf 16V between the 7806 regulator and the tube. Everything seems to be working correctly after the job but a little time will tell - the side cover isn't going on for a few more days at least!

                                      Comment

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