Quote:
Originally Posted by Maarten
HOTs are known to be faked sometimes
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I agree with this. It is interesting with fakes, a lot of the time the fakers get away with it because the device is not pushed near its max ratings in a "threatening environment". But a horizontal output stage often takes the device close to its limits, especially the peak collector-base voltage. In some cases the peak collector voltage only needs to go 15% to 20% higher than what it is running at normally to destroy the transistor. So increases in the supply voltage to the H output stage, a drop in the tuning capacity, or the transistor turned on for a longer period will all result in destruction of the transistor.
Its also important that if the H output transistor has an integral damper diode (collector to emitter) that it is up to spec, the fakers might get that fouled up too.