Replacement Components

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Many components used in the Sinclair hardware, peripherals, etc. are no longer manufactured. However for most of these components there are modern alternatives. Much research was conducted by DEATH and others on the World of Spectrum forums

Transistors

ZX Spectrum 48k

Component Replacement Issue
1 2 3 3B 4 5 6A
TR1 & TR2

ZTX313

BC172 ? ? ? ? ? ? ?
BC183 ? ? ? ? ? ? ?
BC238 ? ? ? ? ? ? ?
BC383 ? ? ? ? ? ? ?
BC547 Y Y Y Y Y Y
BC548 Y Y Y Y Y Y
BC549 Y Y Y Y Y Y
MPS 2369 Y
TR3

ZTX313

BC172 ? ? ? ? ? ? ?
BC183 ? ? ? ? ? ? ?
BC238 ? ? ? ? ? ? ?
BC383 ? ? ? ? ? ? ?
MPS 2369 Y
TR4

ZTX650

BC487 ? ? ? ? ? ? ?
BC489 ? ? ? ? ? ? ?
BC537 ? ? ? ? ? ? ?
BC538 ? ? ? ? ? ? ?
BC737 ? ? ? ? ? ? ?
ZTX651 Y Y Y Y Y Y
TIPP31 Y Y ? ?
TR5

ZTX213

BC251 ? ? ? ? ? ? ?
BC307 ? ? ? ? ? ? ?
BC512 ? ? ? ? ? ? ?
BC557 ? ? ? ? ? ? ?
ZTX750 Y Y Y Y Y Y