On Sep 21, 2004, at 1:11 AM, peter.chadwick@Zarlink.Com wrote:
Traian makes a very good point. Some 35 years ago now, I was at a
company
doing MF SSB maritime transceivers. The Buyer was instructed to buy
the
cheapest transistors, and bought from Microelectronics in Hong Kong.
First
problem was low drive - the 2N3866's were below JEDEC spec on DC Beta,
and
we didn't bother trying to measure Ft. The reliability of the BC108's
was
terrible - they didn't meet the published specification on Vcbo.
And of course, it was all the fault of Engineering!!!!
Somehow, this sounds a bit reminiscent of the horror stories of the
early
3-500Zs from the far east.....
The best one I've heard is way back when the Chinese were using glass
with a high D-factor flux, when the 3-500Z would oscillate at c.
100MHz, the glass around the anode stem would soften and a glass bubble
would form on the vacuum side of the envelope. Sometimes the glass
bubble would pop.
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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