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If R-28 were rated at half the amps output this would not occur but can you imagine a 250 watt resistor, oh wait that's a small dummy load but it's not in paralleled with the output combiners so the smaller one acts as an "INDICATOR" of the imbalance only and that's why it goes nuclear in a nanosecond.

Problems also occur if the transistors are not seated properly to the heat sink such as being over tightened which causes the center portion of the transistor to actually lift from the heat sink surface and begin to heat rapidly and things change fast and imbalances occur at that time also.

Tell tale signs of over tightening of the transistor is marring in the screw holes and this can be checked by placing the transistors on a perfectly flat surface, there should be no clearance between the transistor surface.

[QUOTE="mackmobile43, post: 357041, member: 6232"] If R-28 were rated at half the amps output this would not occur but can you imagine a 250 watt resistor, oh wait that's a small dummy load but it's not in paralleled with the output combiners so the smaller one acts as an "INDICATOR" of the imbalance only and that's why it goes nuclear in a nanosecond. Problems also occur if the transistors are not seated properly to the heat sink such as being over tightened which causes the center portion of the transistor to actually lift from the heat sink surface and begin to heat rapidly and things change fast and imbalances occur at that time also. Tell tale signs of over tightening of the transistor is marring in the screw holes and this can be checked by placing the transistors on a perfectly flat surface, there should be no clearance between the transistor surface. [/QUOTE]

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