1959HWBM Circuit

Discussion in 'Marshall Amps' started by Matteo Corona, Jan 7, 2021.

  1. Matteo Corona

    Matteo Corona New Member

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    Hi Guys,
    I've recently bought an 1959HWBM.
    I would like to know what are the differences in the circuit with the stock 1959HW.
    Are these common mods people make in plexi? how do the mods reflect in the amp sound in your opinion?
    Thanks a lot,
    Matteo
     

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  2. LPMarshall hack

    LPMarshall hack Well-Known Member

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    What’s the BM stand for?
     
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  3. K2JLX

    K2JLX Well-Known Member Gold Supporting Member

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    Bernie Marsdan - Whitesnake.

    from Marshall:

    “Alterations have added gain to the normal and high treble channels giving it a grittier tone. The mids have been adjusted to provide more control of the frequencies at higher mid levels. Finally, the global feedback in the power amp has been adjusted to allow more expression and punch.”
     
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  4. LPMarshall hack

    LPMarshall hack Well-Known Member

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    Sounds like a great amp!
     
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  5. tce63

    tce63 Well-Known Member Gold Supporting Member

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    HNAD, Congrats.

    I really like to have one of this amps one day.

    Cheers :cheers:
     
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  6. Matteo Corona

    Matteo Corona New Member

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    I'm Not Really expert in Marshall mods.
    What I wish to know with this post is if Bernie's mods are or not common Marshall mods people made in their amps. For example Bright mod, gain stages mods. Someone can recognise any common mods?
    I will also wish to share the circuit layout if anyone want to try:band:!!! this amp really rocks!!! I wish to try standard Marshall 1959HW to understand the difference
     
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  7. marshallmellowed

    marshallmellowed Well-Known Member

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    You could be the guy to document this. You could download a 1959 schematic, and document the value variances by marking the BM values next to the 1959 values on the 1959 schematic.
     
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  8. CROWEMAG

    CROWEMAG Well-Known Member

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    This......

    It is so beautiful I want to build one.
     
  9. johan.b

    johan.b Well-Known Member

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    I see a few things different from what i expect from a 1959

    Pot values might also be different but we can't see them..
    J
    Screenshot_20210107-181339_Samsung Internet.jpg Screenshot_20210107-181420_Samsung Internet.jpg Screenshot_20210107-181510_Samsung Internet.jpg

    These are tweaks rather than mods. The 560pF I've seen in 60s amps but is 470 on anything 70s onwards. Also missing compared to 1959SLP is second stage cathode bypass cap
     

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    Last edited: Jan 7, 2021
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  10. purpleplexi

    purpleplexi Well-Known Member

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    Listened to demos on this when it came out and loved it. Why it isn't the benchmark for Marshall tone IDK esp as it seems to sound hot even at low volumes where a 1959 wouldn't even have woken up.
    I had a 59HW it would be straight back to Bletchley to get modded to Bernie spec.
     
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  11. CROWEMAG

    CROWEMAG Well-Known Member

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    I cannot find any sound samples. Mind sharing???
     
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  12. South Park

    South Park Well-Known Member

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    The mods on that amp are nothing new . You get more gain in V1 and some tone shaping in the tone stack . The right combination of gain and tone gives you that sound .
     
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  13. purpleplexi

    purpleplexi Well-Known Member

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    Can only find this one. There was a longer one on one of the US sites....

     
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