Nando,
I'm pretty sure all of the parts are genuine. 90% of the parts came from Farnell. All the driver and output trannies came from there. All are Onsemi, which Farnell buy direct from Onsemi, so no fakes. Some of the signal transistors came from Nikko electronics as they are hard to find, e.g. 2SC2547E. There's so little demand for them that they're not even worth faking.
I am aware that there are a lot of fake semiconductors out there, which is why I only buy from reputable suppliers, or from my friend who is a distributor and has been in the business a long time. She supplies most of her stuff to small companies who make very specialist calibration and test equipment etc. It's not worth buying bargain components, as what you get may not be what you want.
Anyay the problem turned out to be a semi-short between two tracks on the PCB, which was causng a very slow start up to the bias transistor. It's fine now.
Graeme
I'm pretty sure all of the parts are genuine. 90% of the parts came from Farnell. All the driver and output trannies came from there. All are Onsemi, which Farnell buy direct from Onsemi, so no fakes. Some of the signal transistors came from Nikko electronics as they are hard to find, e.g. 2SC2547E. There's so little demand for them that they're not even worth faking.
I am aware that there are a lot of fake semiconductors out there, which is why I only buy from reputable suppliers, or from my friend who is a distributor and has been in the business a long time. She supplies most of her stuff to small companies who make very specialist calibration and test equipment etc. It's not worth buying bargain components, as what you get may not be what you want.
Anyay the problem turned out to be a semi-short between two tracks on the PCB, which was causng a very slow start up to the bias transistor. It's fine now.
Graeme
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