It was a ZTX337 (the marking on the transistor was not even erased). I never got an hold of a ZTX337, but the circuit works also with matched 2N5109 transistors with comparable OIP3 and OIP2 figures.
It was an old unit that I broke open. I'm not sure what Andy made different in the newer versions of the ALA.
Pat.
gandalfg8@... wrote: Oh good.....
can you at least tell us what microprocessor it uses?
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