ZTX751 / ZTX651 Transistor
ZTX651 Transistor
- Replaces ZTX650 on ZX Spectum (TR4)
ZTX751 Transistor
- Replaces ZTX213 on ZX Spectrum in TR5 position (and A733 on 4S boards)
Often when the ZTX650 blows on the ZX Spectrum it will also take out the ZTX213 due to a bad design (run away effect) If both transistors are blown and you only replace one of them it will blow again.