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  1. M

    RM Italy KL203 troubleshooting

    Glad to see you got your amp working. I just got my KL203 working today and have learned a few things. I removed the STP80NF55-06 fets which were installed as mentioned in an earlier post. These weren't working most likely due to their very high input capacitance, which probably caused an...
  2. M

    RM Italy KL203 troubleshooting

    Thanks for the suggestion, the only cap on the input of this amp is across the input transformer primary and appears to be physically intact.
  3. M

    RM Italy KL203 troubleshooting

    Are you referring to capacitor C1 in the relay circuit? That is good as the relay does close with RF applied and I did test the relay contacts to be good.
  4. M

    RM Italy KL203 troubleshooting

    I seem to be having the same issue as arinkuddy, difference here is I've replaced all 4 blown mosfets. Had on hand new STP80NF55-06's and installed those after comparing datasheets with the IRF520. I measure 1.9Vdc at the gates which is below the 2v minimum Vgs turn on voltage. Being new to...
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