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Old 22nd Mar 2014, 10:52 am   #7
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Default Re: Transistor types in Bi-Pak AL60 modules?

ZTX-prefix transistors are still being made. Ferranti's transistor/diode arm became Zetex and has since been bought out by Diodes Inc. Their devices were surprisingly capable, high current capability and high gain in small packages.

Though I think all current produce are SMT

Bi-pre-pak bought spec failure parts and their cases had odd markings if any at all. To replace a device you need to trace out the circuitry and reverse engineer it enough to decide what device ratings are needed.

David
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