How loud is a JTM-45 (2x12" combo) compared to a 40W Fender like the Vibrolux?

Discussion in 'Amps and Cabs' started by Shakkal, Sep 26, 2005.


  1. Shakkal

    Shakkal Member

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    How loud is a JTM-45 type amp (2x12) like the Marshall BB RI or the Germino Classic 45 combo compared to a 40W Fender amp like the SF Vibrolux Reverb?

    We've played in stages where a '69 Vibrolux Reverb (2x12" original Oxford Speakers) can be cranked up nicely ... is the JTM-45 gonna deliver the goods at the same kind of volume, will it breakup sooner or will it have more headroom?

    Thanks!
     
  2. Shakkal

    Shakkal Member

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    ... sorry, that should've read 2x10" Vibrolux Reverb ...
     
  3. trisonic

    trisonic Member

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    The thing is I've never played a SF Vibrolux Reverb 2x10. So we have no point of reference! Does it help you to know that a JTM45 puts out about 33 - 35 watts of power? If you have two Greenbacks in the cabinet it makes quite a bit of difference than if you have two Blues (the Blues are louder).

    Scientifically there's not a lot of difference between 33 and 40 watts.

    Anyway until you come across someone who owns both I trust this helps a little.

    Best, Pete.
     
  4. cameron

    cameron Member

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    I haven't done a direct comparison, but expect the stock Celestions in the Marshall would be more efficient (and hence louder) than the stock speakers in a VR.

    The speakers will be the main differentiating factor. If you plug the two amps into the same cab, they'd probably be about the same overall perceived loudness, though there may be differences in the amps' respective abilties to "cut through"due to differences in frequency response, distortion characteristics, etc.
     
  5. sws1

    sws1 Member

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    If the BB has Greenbacks, it won't be as loud. A greenback can take alot of volume out of the equation.
     
  6. drbob1

    drbob1 Silver Supporting Member

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    Speakers do make a huge difference, but in general:

    The Fender puts out a true 35w RMS clean, the Marshall puts out 35w but it's already distorting. Plus 6L6s have a harder attack than EL34s. So, they make a pretty good match, but the Marshall will likely be overdriving sooner than the Fender. You can get them closer if you use KT66s or 6L6s in the JTM45.
     
  7. Shakkal

    Shakkal Member

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    Thanks guys, that sure helped.

    btw, I can indeed hear a considerable amount of speaker breakup on the VR when cranked due to the old Oxfords.
     
  8. bluesbreaker59

    bluesbreaker59 Silver Supporting Member

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    Okay, in my experience now:

    Had a buddy that used a Fender Vibrolux Reverb RI for a long time, heard him play the amp a million times at the same club with the same band.

    He tells me he wants to borrow my JTM45 RI (with KT66's and other vintage mods) and 1966 Vox 2x12 cab for a gig, so I grant him his wish. The JTM45 was much "sweeter" in the mix, and just tended to "push itself through" better than the Vibrolux. He also agreed that it was no comparison, that the Marshall truly cut through better with better bass response, and a fuller sound overall.

    In my opinion the Marshall isn't necessarily louder, but somehow, it positions itself better in the mix. But of course this is talking about reissue pieces, I have no experience with original JTM45's and only limited experience with vintage Vibrolux Reverbs.
     
  9. Shakkal

    Shakkal Member

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    Thanks man. Did you have a chance to tell which amp began to breakup earlier?
     
  10. sstweed

    sstweed Supporting Member

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    Just FYI, the Fender Vibrolux Reverb RI (really called the Vibrolux Custom Reverb) has NOTHING to do with the SF Vibrolux. It isn't even in the same class of amp IMO. I used to own the the Custom and currently own the SF Vibrolux ('70). The SF is a head and shoulders better amp. I have however no experience with the JTM-45. The ones I have heard have been great sounding darker tones. This isn't to disparage the Marshall at all, actually I would love to own one and have been jonesing for one for some time, but the SF Vibrolux is a VERY bright amp and my guess is the Vibrolux would cut through a mix at a much lower actual volume than the darker Marshall. That isn't to say that one would sound better to you than the other, given the subjectiveness of tone and all. But a Vibrolux cuts very well in a crowded mix.
     
  11. Swarty

    Swarty Member

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    The Bluesbreaker is much louder, regardless of its speakers. If you ran them both together you'd have a hard time hearing the Vibrolux. A Vibrolux Reverb really isn't that much louder than a Deluxe Reverb.
     
  12. bscepter

    bscepter Member

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    I have access to both a Vibrolux RI and a BB. The Vibrolux is louder, but the BB sounds better. Neither sounds as good (or loud) as a Vox. :D
     
  13. Shakkal

    Shakkal Member

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    Thanks again.

    Swarty, I own a Deluxe Reverb, the Vibrolux is my bandmate's so I know what you're saying of their relative volumes. It's just that I'm wanting a classic Marshall tone and I wan't to nail the right amp that won't be overkill for our application ... I already have a couple larger amps that are too loud ...
     

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