Problem With Hight Power Solid State Amplifier

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vytas

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Joined 2003
Please help me!
I Have an amp which is 500W per chanel. Power supply is 100V per rail or +-200V. It is Russian copy of Dynacord PAA990. When I run it till about 40W it woks fine, but when signal gets stronger it beats output transistors. What could it be?
 

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