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You may open this amp and find the negative feedback is already there since this is not the only cause of this type of oscillation. You'll have to look and see. Poor RF layout and PC boards with inadequate ground surfaces can also be the source of this problem. It is essential that the emitter terminal of the transistors be at absolute RF and DC ground potential.

[QUOTE="Shockwave, post: 198428, member: 10882"] You may open this amp and find the negative feedback is already there since this is not the only cause of this type of oscillation. You'll have to look and see. Poor RF layout and PC boards with inadequate ground surfaces can also be the source of this problem. It is essential that the emitter terminal of the transistors be at absolute RF and DC ground potential. [/QUOTE]

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