JTM45 Fit Into A 24" Wide Box?

Discussion in 'Building the Classics' started by bgreed2, Jan 9, 2020.

  1. bgreed2

    bgreed2 Member

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    I am looking to utilize a 2061cx cab (24" wide) due to it's portability over a 1960, so am wondering if a reissue JTM45/2245 (normally 26" wide) would fit into a smaller, 24" custom made (Mojo-tone, Sourmash, etc.) box. Thanks.
     
  2. South Park

    South Park Well-Known Member

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    I don’t think the numbers work. You would be better off building a whole new box . I live in Oxnard if you need a table saw let me know
     
  3. Geeze

    Geeze Well-Known Member

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    How wide is the reissue JTM45/2245 chassis? If [what I call a] 50 watt chassis was used the answer is yes. The '50 watt' chassis used on JMP's is 18.5" [ish] wide. I've stuffed one into a 20" head cab.

    Russ
     
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  4. Chris-in-LA

    Chris-in-LA Well-Known Member

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    The 50 watt Valvestorm chassis is about 18 1/2 inches long and so is their JTM45 chassis.
     
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  5. Kinkless Tetrode

    Kinkless Tetrode Well-Known Member

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    With a JTM45 the height is probably the more important dimension to be concerned about. Especially if one plans on using KT66s.

    Mojo makes a 24" wide head cab for the JTM45, but the height is about 10". The 45 short box cabs also usually have vents on top for the KT66s.
     
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  6. bgreed2

    bgreed2 Member

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    The only dimensions I was able to dig up is from the JTM45 repro kit folks, at a 17-1/4" width. The original Marshall chassis was/is 18+" width. If I end up with a special order it looks like only the faceplate cutout with need to be altered or widened.
     
  7. Geeze

    Geeze Well-Known Member

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    Amen to that! On my first KT66 headshell I had to drill a pair of 2.125" holes above the KT66's as I had a whopping .125" 'headroom' for them in a 9" tall cab.


    [​IMG]

    The second was 10" tall.

    Russ
     
  8. bgreed2

    bgreed2 Member

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    Thanks for bringing this to my attention.
     
  9. neikeel

    neikeel Well-Known Member

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    Yes the steel chassis is a smidge over 18" wide, if you include the mounting flanges, so realistically the narrowest you can go is 20" which is well within your 24" limit. You can use 7581A which are pretty close to KT66s but even stock head cabs are a bit tight for KT66s (always mount your tube sockets inside the chassis, not on top.
     
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  10. neikeel

    neikeel Well-Known Member

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    Do the Mojo ones have vents?
    The original JTM45s would not have had vents in them.
     
  11. bgreed2

    bgreed2 Member

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    To be a little more clear, my intention is to buy a reissue JTM45 and have another smaller width box made to put it in.

    I currently own a 2061x but am just not getting enough headroom with it. It's only a 20w so perhaps the next amp up, power-wise, would be better. We'll see!
     
  12. Kinkless Tetrode

    Kinkless Tetrode Well-Known Member

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    I just looked on their site and apparently they do not make a short box head box with vents anymore.

    To the OP they do make an extra tall 20" wide head box. I'm not really sure that 9.25" tall without vents is tall enough for KT66s , though.
     
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