Best type of resistor to use?

Discussion in 'The Workbench' started by JM5010, Aug 12, 2020.

  1. JM5010

    JM5010 Active Member

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    What is the best type of resistor to use in Marshall amps?

    Specifically, what is best to use for: the plates, the cathodes, voltage dropping, etc...

    I'm not talking about wattage, just the composition!

    Edit: What types of resistors did Marshall use in the 70's?
     
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  2. mickeydg5

    mickeydg5 Well-Known Member

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    People like different composition for different use.

    I think it is mostly limited to carbon types used in signal chain events. The same goes for different composition of capacitors.
     
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  3. JM5010

    JM5010 Active Member

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    Hmm let me get specific. What would you use in a high gain build?
     
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  4. Seanxk

    Seanxk Well-Known Member

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    60's Piher film and ABradley comp, 70' Iskra film then later back to Piher.

    On a build I would use Piher, only because I don't have many Iskra.
     
    Last edited: Aug 12, 2020
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  5. neikeel

    neikeel Well-Known Member

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    Good advice here:
    http://www.aikenamps.com/index.php/technical-q-a
    In a true high gain build I would use metal film in most spots, flame proof metal oxide as droppers/decouplers in teh B+ line. Having said that for most normal builds decent quality carbon film are fine and hi-gain is not typically my genre but I do like amps that are dead quiet when you are not injecting signal. New builds I still use Xicon 1w and in clones, restos I like the Pihers. For true restorations I would use Iskra or Piher depending on what has been removed/being replaced. will occasionally use a carbon comp but they do drift and get noisy (aka vintage warmth which can = irritating hiss or crackle depending on you perspective). My son is currently prepping for a x4 KT120 bass amp and it is a relatively simple set up so might try something exotic from the Hifi world like Kiwame or Takman but may still just go for the Vishay CCF60 metal film which sound ideal.

    Look at some of the builds by FourT6and2 and others.
     
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  6. thetragichero

    thetragichero Well-Known Member

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    i try to use 2w metal oxide resistors pretty much everywhere besides on the input (metal film there)
     
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  7. Guitar-Rocker

    Guitar-Rocker Well-Known Member

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    For high gain, I would suggest the Vishay metal film PR02 line of 2W resistors. They are the same size as a standard 1/2watt carbon film resistor and are excellent in clarity and are not sterile sounding. I have used those in many builds in the preamp section, with excellent results for plate applications.
     
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  8. JM5010

    JM5010 Active Member

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    Awesome suggestions!
     
  9. mickeydg5

    mickeydg5 Well-Known Member

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    I like clean so it would most likely be modern design and compound resistors (like @Guitar-Rocker mentioned) and capacitors. I would get my dirt from overdriven tubes and solid state/microprocessor items.

    Dirty people will rather carbon type resistors and old style compound, film and ceramics while driving things into oblivion.

    I cannot exclaim exactly what I would use because I have not don discovery on everything that I might be interested in but I do tend to like CDE (including Orange drop type) and Vishay components.
     
    Last edited: Aug 16, 2020
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  10. JM5010

    JM5010 Active Member

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    Awesome! Time to continue my modding madness.
     
  11. mickeydg5

    mickeydg5 Well-Known Member

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    I am guessing SBE is basically gone falling under Advanced Conversion now and Orange Drop is cancelled by them but maybe picked up by CDE company.

    Everything changes over time. :( :D
     

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