TRS-80 Model 12 crt substitution

If the M12 is anything like the M2 it just uses a standard 12" B&W TV tube. When my model 2 was 'handled' by airport baggage crews they smashed the screen to bits, so I replaced it with the screen from a standard old B&W TV. If that's the case remember to change only the tube itself, ie leave ALL the wiring behind - you must loosen the holding screw(s) on the yoke (the mass of copper wiring) and fit it to the 'new' tube. Remember not to tighten too tightly! I'm assuming you also know that if you power up the replacement screen and it doesn't work you must either discharge the tube with a suitable EHT meter on the connection to the flyback transformer (very thick wire going to the back of the screen rather than to the neck) or leave it overnight to discharge itself before swapping in another one. Tony will be along soon with some more info :o) Cheers -- Adrian/Witchy Owner & Webmaster, Binary Dinosaurs www.binarydinosaurs.co.uk - possibly the UK's biggest online computer museum www.snakebiteandblack.co.uk - ex-monthly gothic shenanigans :o(