JTM45 too much for a single G12H30?

Discussion in 'Amps and Cabs' started by CitizenCain, Jul 8, 2006.


  1. CitizenCain

    CitizenCain Member

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    If I don't turn it up past 7 or so?

    I can swing a combo cab for my Ceriatone JTM45 if I can use the only 12" speaker I've got lying around, a G12H30 Anniversary model.

    I'd like to get the combo setup before the week after next, but I can't swing a new speaker and the cab at the same time.

    If I keep a lid on it, the Celestion should hold up OK, right?
     
  2. themusicboxstudios

    themusicboxstudios Member

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    aren't jtm-45s only 30 watts?

    if so, it would work for sure.
     
  3. CitizenCain

    CitizenCain Member

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    I think the output depends on the tube compliment. Mine has two Valve Arts KT-66s. Even if it's rated for 30 watts, it can push more if it's really clipping. That's why I thought if I keep it less than full throttle I'd be OK, at least for a while :)

    Doesn't Celestion rate their speakers kind of conservatively, too?
     
  4. jgyn

    jgyn Member

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    I'd go with, say, a Vintage 30, which is rated at 60 watts.
     
  5. Broken

    Broken Member

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    Don't put a V30 in it, 45's sound terrible with them. You need a 2x12 with G12H's or Greenbacks
     
  6. 1964

    1964 Member

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    Emi Wizard
     
  7. Skip62

    Skip62 Member

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    It took over 6 months to ruin my Greenback with my JTM45. Greenback's only rated for 25watts. I used 6L6's and EL34's. It wasn't until I got carried away for about month that it gave up and sounded really squirrelly on me. Just my "1" experience, may not be true the next time.
     
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  8. doctord02

    doctord02 Member

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    At 7 you are already over the full undistorted output in all likelyhood; I believe there is a similar discussion where John Phillips laid that assumption to rest. I have a JTM45 that I built and I'm willing to bet it puts out over 30 watts when its at 5 on the volume control. Plus it's not just the wattage, its the whole package - volume, transients, frequency, heat, vibration, yadda yadda.

    I wouldnt risk it.
     
  9. Cary Chilton

    Cary Chilton Senior Member

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    Broken is right, PLUS VINTAGE 30 are fizzy S$#% speakers, ....imo, sorry, but I FREAKEN HATE THEM
     
  10. Scumback Speakers

    Scumback Speakers Gold Supporting Member

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    You'll be sniffing a 30 watt speaker pretty quickly using it with a JTM 45...always use 2 speakers with them...or keep your local speaker reconer's number handy.

    Here's a true story. My first Scumbag amp client, using the dual 6V6 model (10 watts clean, 19 dimed...er...elevened :D ) wanted to use a G12-65. No problem, got one at OCSR with a Celestion kit in it. 1 yr warranty. 65 watt power handling should be no problem, right?

    Yeah, except he had an attenuator, and he "occasionally" put an OD and a few other pedals in front of it. 14 months later, the speaker fried, went open voice coil, took out a resistor and a pair of 6V6 tubes, too.

    Can't say as to whether it was the attenuator, or the speaker, but I suspect the attenuator...but...moral of the story, went with two Pre Rola 30 watt G12H30's, and no issues for the past two years.

    If you're going to tempt fate with a JTM 45, I think 65 watts power handling is the way to go...minimum. I run mine through a 2x12, just to cover my butt, although they're 30 watt 12's.
     
  11. tjs

    tjs Senior Member

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    Let me see if I have this right: a ~19 watt amp dimed blew a speaker with a 65 watt power rating?:eek:

    Has anybody else heard of something like this happening, or was this just an unusual occurence? I know that transients and clipping can blow a speaker that is overrated for the amp it's used with, but I didn't realize that it could blow one with that big of a power handling cushion.
     
  12. krash

    krash Member

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    howabout an Eminence Wizard. All of the tone of a G12H30 with 2.5x the power rating and a coupla dB more efficiency to boot.

    It's also much redder :)
     
  13. CitizenCain

    CitizenCain Member

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    I've been reading speaker threads like a madman the last couple of days. I'm convinced that I should bite the bullet and just get a different speaker.

    The Emi Wizard sounds like a good bet, but I got bug-eyed reading the 135+ page Emi thread! The Tonker sounded like the right choice for a while, then the Texas Heat popped up, now there's the new Neomag versions. Oh man!

    I want nice piano tones and glassy/Hendrixy cleans on the Fendery guitars and a tight bottom (no farting) with a solid punchy midrange for my OD Gibson sound.

    What's good for that?

    Thanks for the replies. I'm spinning into a hole pretty quick with all the options :D
     
  14. Scumback Speakers

    Scumback Speakers Gold Supporting Member

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    My condolences. That has to be the biggest thread ever. I gave up at 40 pages.

    If you're going with an open back 1x12 cab, I'd recommend the H55-16HP for deeper lows with the Strat/Tele style guitars, and H75-16HP if you have enough lows already, or use LP/Humbucker guitars. I find most JTM 45 clones put out a LOT of bass, I run mine at 2-4, for example with the H75 model Scumback in a closed back cab.
     
  15. HeeHaw

    HeeHaw Member

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    I'm gonna' tell you guys that I got a set of Scumback 65 watters that pretty much stood up to the punishment of a Splawn 100 watter and came through with flying colors.:cool:
     
  16. tga-3

    tga-3 Supporting Member

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    I read in one of Gerald Weber's books that Billy Gibbons runs a JTM-45 through a G12H-100 in an open back cab. I have one in an old style Dr. Z open back 1x12 and it handles everything I've thrown at it, like a Demeter TGA-3, Budda Stringmaster, and Dr. Z Route 66. I know it's not very popular around here. It's a little dry in the mids, but the bottom end stays nice and tight and I don't have to worry about the wattage.
    FWIW,
    Rick
     
  17. Red Planet

    Red Planet Member

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    +1 on the Eminence Wizard.

    75 watts and they dont need to be broken in (translation) they dont have that raspy high mid hump that the Celestions come with but loose after a year of solid playing. The more I listen to this speaker (currently in my SDG Vintage Tweed Proluxe) the more I like it.
     
  18. ekkybedmond

    ekkybedmond Member

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    Would a 30W be OK in a 1xEL34 (or 6L6) combo, woth 15W OT ? I use dirt pedal, but rarely drive my amps to the max, I doubt if I will this one.

    Thxs
     
  19. electricity17

    electricity17 Supporting Member

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    Creamback H should work as an option.
     
  20. mjtripper

    mjtripper Supporting Member

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    I'd say the creamback h would be a good choice.
     

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