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Thread: EVH tube layout

  1. #1
    Super Toneologist Coma's Avatar
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    Default 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:

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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. #2
    Mojo's Minions Gtrjunior's Avatar
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    Default 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?

  3. #3
    Super Toneologist Coma's Avatar
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    Default Re: EVH tube layout

    Quote 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

  4. #4
    Mojo's Minions Gtrjunior's Avatar
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    Default Re: EVH tube layout

    Quote 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.

  5. #5
    Super Toneologist Coma's Avatar
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    Default Re: EVH tube layout

    Quote 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

  6. #6
    Mojo's Minions LLL's Avatar
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    Default Re: EVH tube layout

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



    Fastest ears in the West

    Quote Originally Posted by Edgecrusher View Post
    I thought it sounded great, until I heard something that sounded good.
    Guitaramped.com

  7. #7
    Mojo's Minions devastone's Avatar
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    Default 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.

  8. #8
    Mojo's Minions LLL's Avatar
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    Default 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

    Quote Originally Posted by Edgecrusher View Post
    I thought it sounded great, until I heard something that sounded good.
    Guitaramped.com

  9. #9
    Super Toneologist Coma's Avatar
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    Default 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

  10. #10
    Super Toneologist justFred's Avatar
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    Default Re: EVH tube layout

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

  11. #11
    Super Toneologist Coma's Avatar
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    Default Re: EVH tube layout

    Quote 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

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