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(Topic ID: 273249)

Stern SB-300 Sound board oddities..

By Coyote

3 years ago



Topic Stats

  • 6 posts
  • 3 Pinsiders participating
  • Latest reply 3 years ago by barakandl
  • Topic is favorited by 2 Pinsiders

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    #4 3 years ago
     
    MAR

    MarAlb

    Pinside member

    NL Zeist

    9y 53,650 814 19

    Interesting. I have one which sounds like an old AM/MW radiostation. It is missing everything above appr 2kHz and sounds very dull. Replaced the caps, tried another amplifier, replaced the 6840 timer, and tried another MC3340 but that didn't change anything. The voltage over the zenerdiode seems okay, I never replaced that one but I will do that on my next attempt; didn't know that one is critical. This board has a sticker marked "B" and seems to be a bit older as other boards with a "C" marked sticker. Are there different revisions with changes?

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