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Old 13th June 2003, 01:32 AM   #11
AJT is offline AJT  Philippines
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Join Date: May 2003
Location: Palatiw, Pasig City
jojo,
it is possible to have oscillation problems in an amp specially with a common emmiter type output stage, if you are fammiliar with the "kinetic" amps sold locally, these amps are notoriuosly prone to such oscillations...so that whenever i am asked to repair one, i politely turn down unless i can change the output stage...Ft is the gain bandwith rating of a power transistor, it is when the small signal gain of the transistor reaches unity at a maxed frequency, it is common for power transistors to have ft's of 2-4mhz while small signal transistors have 100-up mhz....i use 10ohm 1 watt resistors as fuses when testing amps, you know by now how fast you can loose your power transistors with a slight mistake such as a reversed bias diodes.....cheers...
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