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  1. #1
    Baluchitherium
    Join Date
    09.24.02
    Location
    North Central OKC
    Posts
    4,582
    Favorite VH Album

    VH, WACF, FW, 5150, OU812
    Favorite VH Song

    Dreams/Unchained/InASR/5150
    Last Online

    11.25.17 @ 04:30 AM
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    Default Vox AD50VT with tube upgrade

    I own a Vox AD50VT, a modeling combo amp. It's a great, low-end amp that I don't feel bad about taking everywhere...you know, leave the nice amp at home, take the cheap amp to the gig. I can wring all sorts of sounds from it, from vintage clean to molten modern metal. Very flexible.

    Anyway, it has a 12AX7 tube/valve in it (a Russian-made ElectroHarmonix). I took it out and replaced it with a 12AT7 (NOS Mullard CV4024-ECC81-12AT7 purchased from KCA NOS Tubes). It completely changed the sound of the amp. There's a slight reduction in gain, but the tone is to fat and warm...a friggin' whole lotta Rosie.

    I have run through all the "amps" and sounds for the last hour and this amp totally kicks ass now. A simple $36 upgrade turned this $400 amp into something at least three times better. Seriously.

    "The shit I read on this site." -- Dave's Dreidel (Nov 6th, 2013)

    "Don't ever confuse talent with fame." -- Bob Lefsetz

    "There's very little greatness in this world, but in the crucible of quality there's a special corner reserved for Van Halen." -- Bob Lefsetz

  2. #2
    Good Enough
    Join Date
    12.15.07
    Location
    Iowa/Illinois
    Posts
    1,807
    Favorite VH Album

    Balance
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    10.26.16 @ 03:37 PM
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    Default

    Definitely dude! Especially in preamps or moddeling amps with only say 1 or 2 tubes in them, a tube swap can make a HUGE difference.

    I haven't used any Mullards, but I have a stash of a few old RCA 12AX7s, and wow -- in the V1 spot, they make a noticable difference even in my 5150 combo.

  3. #3
    Baluchitherium
    Join Date
    09.24.02
    Location
    North Central OKC
    Posts
    4,582
    Favorite VH Album

    VH, WACF, FW, 5150, OU812
    Favorite VH Song

    Dreams/Unchained/InASR/5150
    Last Online

    11.25.17 @ 04:30 AM
    Likes
    290
    Liked 298 Times in 161 Posts

    Default

    What kind of stock tubes are in the 5150? For that price, please tell me they're not your typical Chinese/Russian suppositories.

    "The shit I read on this site." -- Dave's Dreidel (Nov 6th, 2013)

    "Don't ever confuse talent with fame." -- Bob Lefsetz

    "There's very little greatness in this world, but in the crucible of quality there's a special corner reserved for Van Halen." -- Bob Lefsetz

  4. #4
    Good Enough
    Join Date
    12.15.07
    Location
    Iowa/Illinois
    Posts
    1,807
    Favorite VH Album

    Balance
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    10.26.16 @ 03:37 PM
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    Default

    I'm not sure. Both of my combo's I got used, and both were made in 1995, so the original tubes were long gone. I have heard that the original heads had Sylvania tubes in them, at least for the power tubes. I have also heard that Electro Harmonics preamp tubes were often common in the later 90's in all of the 5150 models, and other than that, some generic chinese tubes were used.

    And now I have seen that at least some 5150 III's come stock with JJ tubes (YAY!).

 

 

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