Marshall Origin 20H Tube replacement | The Canadian Guitar Forum

Marshall Origin 20H Tube replacement

Discussion in 'Amp Building/Technical/Repair' started by Asifur, Jan 14, 2020 at 7:30 PM.

  1. Asifur

    Asifur

    Joined:
    Oct 5, 2018
    Location:
    Mississauga, Ontario
    Hi,

    I play through a cranked Marshall Origin 20H with a G12 Greenback speaker. I was planning to replace the current EL34s with 6CA7s once they wear out. Is this a feasible option, or would I have to adjust the bias?
     
  2. nonreverb

    nonreverb Gold Member

    Joined:
    Sep 19, 2006
    Location:
    Ottawa, ON
    I believe the 20H is cathode biased therefor, no adjustment is required.
     

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