TRS-80 Model 12 crt substitution

From: Tony Duell <>
Date: Wed Mar 3 18:10:11 2004

> Hello,
> I broke the neck off the crt in my TRS-80 Model 12. I have a crt from a =
> Model 4. Can I use this in the Model 12 or will it cause problems like =
> smoke etc.? Thanks.

My experience suggests that monochrome CRTs are pretty generic. Bascially
you have to match up the physical size of the screen, the deflection
angle, the heater voltage, and the pinout. If you get those right, then
you'll get something recognisable on the screen, no smoke. You'll most
likely get a good picture!

Assuming it's a 12" 90 degree deflection angle one (the M4 certainly is),
then there are 2 main types. 7 pin (modified B7G) base, with a 12V heater
and a narrow neack and 8 pin (B8H) with a 6.3V heater and a wide neck.
The M4 is of the former type. If the M12 yoke and socket will fit, then
my guess is that it will work fine.

Received on Wed Mar 03 2004 - 18:10:11 GMT

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