The Official Marshall Studio Vintage Thread Sv20h

Discussion in 'Marshall Amps' started by Michael Roe, Jan 26, 2019.

  1. Gaz Baker

    Gaz Baker Well-Known Member

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    It's a conspiracy :scratch::squint:
     
  2. trovador

    trovador Well-Known Member

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    Let's get this thread back on track. SV rules!!:shred2::thumb:

    [​IMG]
     
  3. Gaz Baker

    Gaz Baker Well-Known Member

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    What's that guitar?
     
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  4. marshallmellowed

    marshallmellowed Well-Known Member

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    The SV guys are too busy playing... :shred: (except for me, obviously).
     
    Last edited: Apr 20, 2020
  5. MarshallGuySC

    MarshallGuySC Active Member

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  6. trovador

    trovador Well-Known Member

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    It's a guitar I built 3 years ago. LP style body (Mahogany/maple) and Brazilian rosewood neck with trem.

    [​IMG]
    [​IMG]
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  7. Gaz Baker

    Gaz Baker Well-Known Member

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    It's beautiful. Nice job!
     
  8. Bob Arau

    Bob Arau New Member

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    Hi guys, first post here!! Long time Fender amps player and recently a Marshall converted. Loved the original Plexi tone but hated the wattage. The SV20 suits me perfectly... so far I’ve pulled V1 for an old East European tube and it improved the sound a lot...

    My question goes as for speaker connections. I have two cabs, single speakers each: a 1970 Pulsonic Greenback 55Hz 8ohms and a 1980 Greenback 75Hz 16ohms. Can I hook them up matching impedance (i.e. one wired to speaker out 16ohms and the other to 8ohms out)? I’ve already wired them in parallel -mismatching impedance - at either the 16ohms or the 8ohms jacks and it’s a killer sound... Any info much appreciated... tks!!
     
    Last edited: Apr 21, 2020
  9. Mr. Natural

    Mr. Natural Active Member

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    Welcome to the forum. I can't help you with your question, but there PLENTY of guys here that can. On technical stuff, you'd be better off asking Dear Abby than me.

    Again, welcome to the forum.
     
  10. tce63

    tce63 Well-Known Member Gold Supporting Member

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    I am not sure, but you will soon get answers from other members.

    But :welcome: to the forum, a great place.

    Cheers:cheers:
     
  11. marshallmellowed

    marshallmellowed Well-Known Member

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    If I'm understanding what you're asking, you're wanting to plug both a 16 ohm, and an 8 ohm cab into your SV20. If that's correct, just plug both cabs into the "2x8" ohm jacks. The amp will be looking for a 4 ohm load, and you'll be connecting roughly a 5 ohm load. As long as the load is a higher impedance, with a slight mismatch, you'll be fine.
     
  12. mirrorman

    mirrorman Well-Known Member

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    SV20H incoming!!!
    :fever:
    Hopefully will be able to pick it up next week.
    I was torn between this and the SC20H but have been finding myself needing less distortion the last couple of years and figured this would be a better fit for what I'm playing now. I figure I can smack the front end with a Bad Monkey, OCD or SD-1 for a bit more growl if I need it anyway.
     
  13. marshallmellowed

    marshallmellowed Well-Known Member

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    Congratulations, both are great little amps, can't go wrong with either.
     
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  14. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member VIP Member

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    Welcome to the forum
    The mismatch is not good for your amp.
    But I have been doing something similar with my Dsl40c’s..
    No problem so far 3 years, but not pushing the amps much with this mismatch.
    Cheers
     
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  15. R.H

    R.H Robo Sapien Noisemaker Silver Supporting Member

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    Hey - could I trouble you to show the math on that? It doesn’t seem like the same formula used when combining equal loads.
     
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  16. Dean40

    Dean40 New Member

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    I believe it's
    R1xR2÷R1+R2

    8 ohms × 16 ohms = 128ohms
    8 ohms + 16 ohms = 24ohms
    128ohms ÷ 24ohms = 5.3ohms
     
  17. pedecamp

    pedecamp Well-Known Member

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  18. marshallmellowed

    marshallmellowed Well-Known Member

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    Correct, A+ :)
    This is the formula for resistance, of course. Impedance is actually slightly different than straight resistance, but the formula is close enough for this purpose.
     
  19. R.H

    R.H Robo Sapien Noisemaker Silver Supporting Member

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    So has anyone put KT66s in their 20H? If so, any trouble with the fit?
     
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  20. Bob Arau

    Bob Arau New Member

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    Thanks for the reply. I got a great deal on a 4x12 1960AV (Celestion V30s - 16ohms). It sounds great, but I prefer my 55Hz greenbacks at 8ohms. So I rearranged the 4x12 with 2 8ohms speakers (G12H Pulsonic 55Hz) wired in series at the right side of the cabinet; plus 2x 16ohms speakers (G12M 75Hz and V30) wired in parallel at the left side of the cabinet. That way I can run the combo Pulsonics at 16ohms or the combo G12M/V30 at 8ohms. I even run the 4x12 mismatching impedance (at the 8ohms out) and it sounds killer!!
     
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