Https://r.search.yahoo.com/_ylt=Awr9DtVGSN5bJo8AUtZXNyoA;_ylu=X3oDMTByNDZ0aWFxBGNvbG8DZ3ExBHBvcwM2BHZ0aWQDBHNlYwNzcg--/RV=2/RE=1541322950/RO=10/RU=https%3a%2f%2felektrotanya.com%2fpeavey_kb2.zip%2fdownload.html/RK=2/RS=v0cqyXdd15jxSmLgvz06.J9xeZ8- This is the link to the service manual. Sounds like the power transistor is failing.
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Https://r.search.yahoo.com/_ylt=Awr9DtVGSN5bJo8AUtZXNyoA;_ylu=X3oDMTByNDZ0aWFxBGNvbG8DZ3ExBHBvcwM2BHZ0aWQDBHNlYwNzcg--/RV=2/RE=1541322950/RO=10/RU=https%3a%2f%2felektrotanya.com%2fpeavey_kb2.zip%2fdownload.html/RK=2/RS=v0cqyXdd15jxSmLgvz06.J9xeZ8- This is the link to the service manual. Sounds like the power transistor is failing.