Marshall lead 100 model 2098 choke help anyone?

Discussion in 'The Workbench' started by Repairguyssr, Oct 21, 2020.

  1. Repairguyssr

    Repairguyssr New Member

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    Hi I'm repairing a vintage lead 100 model 2098. On the circuit board the part is labeled "CH1" is strapped to a 10ohm 5 watt resistor. The schematics ive sourced. Do not show a value or any info other than its a axial ferrite magnet choke. Its on the output trace of the board. Can anyone tell me where to get this part or even what value the choke is? Thanks!
     
  2. Jon Snell

    Jon Snell New Member

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    They never fail.
    It consists of around 12 turns of 20 SWG enamelled copper wire on a fettite former. I have used old ferrite aerial core cut down to size. OR, use a 10R 3W Metal Oxide resistor with 22turns of 22 SWG enamelled copper wire wrapped around it.
    The purpose is to help the amplifier stay reasonably stable at higher frequencies.
     
  3. Repairguyssr

    Repairguyssr New Member

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    Thanks so much for the reply. Whatever happened to this poor amp, the choke was melted and all the enamel.on the wire burned off and it shows zero resistance because of that. I suppose I could get some 20gauge enamel wire and rewind it resusing the ferrite core.. have you had any luck doing this?

    Thanks again!
     

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