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  • EVH tube layout

    Just opened up my EVH 5153 100W to look for tubes gone bad. Going by the weird crackling and hissing, most likely its one of the preamp tubes. In the process, found out that one power tube was about to go (glowing very intensly, small burn mark on the back of the glass).

    I was comparing the tube layout sticker on the inside of the amp to the PCB layout drawing that came with it, and then comapred it to official documentatino available online. Something doesn't add up.

    This is the tube layout, according to the schematic and EVH webpage:

    Click image for larger version

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    And here's what's on the inside of the head shell:

    Click image for larger version

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    Front row has been flipped around. According to the sticker, that is.
    --------------------------------------------------------
    1973 Aria 551
    1984 Larrivee RS-4 w/ EMG SA/SA/89
    1989 Charvel 750 XL w/ DMZ Tone Zone & Air Norton
    1990's noname crap-o-caster plywood P/J Bass
    1991 Heartfield Elan III w/ DMZ mystery pups
    1995 Aria Pro II TA-65
    2001 Gibson Les Paul Gothic w/ PG-1 & SH-8

  • #2
    Re: EVH tube layout

    In most amps V1 is located closest to the input jack.
    I donít know if that is the case with your particular amp but I donít see why it would be different. Unless there is some design difference with this amp vs. a traditional signal path of other amps.

    Is it possible that the layout changed at some point and the schematics you have reflect 2 different versions of the amp?

    Comment


    • #3
      Re: EVH tube layout

      Originally posted by Gtrjunior View Post
      Is it possible that the layout changed at some point and the schematics you have reflect 2 different versions of the amp?
      That was my assumption as well, esp since the image from their documentation indicates there have been multiple revision, whereas mine seems to be from an earlier run.

      Still, I have all the papers that came with the amp, and there the tube layout seems to match what's on their page, so I dunno.
      --------------------------------------------------------
      1973 Aria 551
      1984 Larrivee RS-4 w/ EMG SA/SA/89
      1989 Charvel 750 XL w/ DMZ Tone Zone & Air Norton
      1990's noname crap-o-caster plywood P/J Bass
      1991 Heartfield Elan III w/ DMZ mystery pups
      1995 Aria Pro II TA-65
      2001 Gibson Les Paul Gothic w/ PG-1 & SH-8

      Comment


      • #4
        Re: EVH tube layout

        Originally posted by Coma View Post
        That was my assumption as well, esp since the image from their documentation indicates there have been multiple revision, whereas mine seems to be from an earlier run.

        Still, I have all the papers that came with the amp, and there the tube layout seems to match what's on their page, so I dunno.
        You know, might not be a bad idea to either post a question on an EVH specific forum or better yet email them directly with the serial number so they know what year your amp is.

        Comment


        • #5
          Re: EVH tube layout

          Originally posted by Gtrjunior View Post
          You know, might not be a bad idea to either post a question on an EVH specific forum or better yet email them directly with the serial number so they know what year your amp is.
          That's the first thing I did. But forums are usually a lot quicker (and in the case of some companies I've had to deal with, a lot more reliable as well).
          --------------------------------------------------------
          1973 Aria 551
          1984 Larrivee RS-4 w/ EMG SA/SA/89
          1989 Charvel 750 XL w/ DMZ Tone Zone & Air Norton
          1990's noname crap-o-caster plywood P/J Bass
          1991 Heartfield Elan III w/ DMZ mystery pups
          1995 Aria Pro II TA-65
          2001 Gibson Les Paul Gothic w/ PG-1 & SH-8

          Comment


          • #6
            Re: EVH tube layout

            That's a metric ****-ton of preamp tubes.
            Lefty Lounge Lizard's Guitars & Amps Extravaganza

            Fastest ears in the West

            "Where you can swap out one pickup magnet and instantly become an expert at everything."

            My Soundcloud

            Comment


            • #7
              Re: EVH tube layout

              Wow, not sure what they are doing with that many tubes. But, yes, V1 should be closest to the input jack to reduce extra noise, especially with that many tube stages! Let us know if they say different, but I can't imagine it.

              Comment


              • #8
                Re: EVH tube layout

                Multiple channels no doubt. But still - 8 preamp tubes.
                Lefty Lounge Lizard's Guitars & Amps Extravaganza

                Fastest ears in the West

                "Where you can swap out one pickup magnet and instantly become an expert at everything."

                My Soundcloud

                Comment


                • #9
                  Re: EVH tube layout

                  There ya go
                  --------------------------------------------------------
                  1973 Aria 551
                  1984 Larrivee RS-4 w/ EMG SA/SA/89
                  1989 Charvel 750 XL w/ DMZ Tone Zone & Air Norton
                  1990's noname crap-o-caster plywood P/J Bass
                  1991 Heartfield Elan III w/ DMZ mystery pups
                  1995 Aria Pro II TA-65
                  2001 Gibson Les Paul Gothic w/ PG-1 & SH-8

                  Comment


                  • #10
                    Re: EVH tube layout

                    Channel 3 must be able to peal paint off the wall!!!

                    Comment


                    • #11
                      Re: EVH tube layout

                      Originally posted by justFred View Post
                      Channel 3 must be able to peal paint off the wall!!!
                      I can for a fact confirm that yes, yes it does.
                      I've never dimed it, not even close. I keep the gain between noon and 2 o'clock, and the volume usually around 10 and that's with my drummer and bass player tearing it up in the same room.

                      Thank God for ear plugs, amirite?
                      --------------------------------------------------------
                      1973 Aria 551
                      1984 Larrivee RS-4 w/ EMG SA/SA/89
                      1989 Charvel 750 XL w/ DMZ Tone Zone & Air Norton
                      1990's noname crap-o-caster plywood P/J Bass
                      1991 Heartfield Elan III w/ DMZ mystery pups
                      1995 Aria Pro II TA-65
                      2001 Gibson Les Paul Gothic w/ PG-1 & SH-8

                      Comment

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