4212 suddenly has an excessive fizzy overdrive sound

Discussion in 'Marshall Amps' started by geddy, Jan 26, 2020.

  1. geddy

    geddy Active Member

    Nov 11, 2013
    Likes Received:
    When I say suddenly, I only noticed it yesterday. Amp seems to be overdriving 'too soon' on both channels. Just seems to be a fizzy edge to the sound which Im sure is new. I'm suspecting a pre amp valve, maybe V1 as 1 half is common but just looking for opinions in case rolling valves doesn't identify the problem.

    Its a later version with the transistor IC for switching. Was last serviced at the factory about a year ago.

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