Question about choke sizes for upcoming Marshall JMP 1987 lead spec build

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by Xlch721, Apr 6, 2015.

  1. Xlch721

    Xlch721 Member

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    I ordered one the Triode Electronics 1987 lead spec kits and was wondering how much of a difference to the overall tone a 3H Choke would make VS a 5H or a 20H Choke.
    What Choke would you use if it was your build ?
    This is my first big amp build after doing multiple 18 Watters and General repairs to my own amps and the occasional fix for a friend.
    Triode has not sent the transformers yet but im pretty sure when I ordered the kit I selected the 5H choke because it was the closest to the one from the Metro Amp site 8H choke.
    Thanks in advance
    Bryan
     
  2. donnyjaguar

    donnyjaguar Member

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    In terms of inductance, hardly any. The energy storage capability of the choke is pretty much negated by the PI filter design itself. A bigger choke will filter out slightly more residual hum, but so would a resistor.
     
  3. Xlch721

    Xlch721 Member

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    The way the person I spoke to at Triode explained it was if I wanted an aggressive slightly woody tone (ala Jimi Hendrix) go with the 5H choke, If i wanted a little more compressed tone ( Ala AC/DC ) go with the 20H choke. They told me they would have no problem swapping the choke out as long as I let them know before Thursday when they ship the rest of my parts. Currently I have them shipping me the 5H choke because it was the closest to the one on the Metro Amp Site.
     
  4. donnyjaguar

    donnyjaguar Member

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    I think the greater resistance of the 20H choke vs the 5H is the more likely cause of any tone difference than the inductance itself.
     
  5. Xlch721

    Xlch721 Member

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    Ok My understanding from what the folks at Triode told me said the tone would be tighter bottom but a bit more compressed. Should be good either way I have a FF clone, Rangemaster, OCD.and a TS9 along with the Preamp of my Echoplex to slam the front end with anyways along with a compressor so I should be good to go. Been years since Ive owned and played through a Four Holed Marshall cant wait.
     

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