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Hi guys.. I currently have flu (again!) so dispatch may be slower than usual. Will do my best though. Thanks for your patience - Phil.
ZX Spectrum Transistors
Some of the transistors originally used in the Spectrum are now obsolete - listed below are some suitable replacements.
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A general purpose NPN transistor that can be used to make an alternative version of composite video mod on the Spectrum. Using a transistor instead of a simple wire or capacitor provides a stronger signal, usually giving a brighter picture. It also buffers the Spectrum's video circuitry so much of the load is taken by this transistor. However, it may not be compatible with modern LCD TVs.
Transistor video mod connections:
Note: Alternatively, two BC549s can be used to replace TR1 and TR2 to give a brighter picture when the composite mod is done uisng a capacitor (though they must be fitted rotated 180' compared to the silk screen legend). Please see this article for details.
A cheaper replacement for the obsolete ZTX313 (has same pin-out / case orientation and approx same spec)