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Note the hundreds of small holes punched in this professional PA board. Each one is a conductive feed through bushing to the groundplane surface on the back of the board. This provides the lowest inductance paths to ground and offers the high gain amplifier the best chances of running completely stable.

Contrast that to the other board pictured that has none of these. What you will see is copper foil soldered around the edges of the board near critical areas. My guess is that the thing will oscillate without that foil and probably is not 100% stable even with it.

[QUOTE="Shockwave, post: 699725, member: 10882"] Note the hundreds of small holes punched in this professional PA board. Each one is a conductive feed through bushing to the groundplane surface on the back of the board. This provides the lowest inductance paths to ground and offers the high gain amplifier the best chances of running completely stable. Contrast that to the other board pictured that has none of these. What you will see is copper foil soldered around the edges of the board near critical areas. My guess is that the thing will oscillate without that foil and probably is not 100% stable even with it. [/QUOTE]

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