Hot Wire to Cut PVA Bond Between a CRT and Its Safety Lens?

Jules Richardson jules.richardson99 at
Sun Dec 7 12:48:55 CST 2014

On 12/07/2014 11:47 AM, Bob Vines wrote:
> Does anyone have instructions or a schematic (or a pointer to a URL)
> on how to make a "hot wire" device to cut the PVA bond between a CRT
> and its safety lens?  What kind of power supply (how much power), "hot
> wire," etc.?

I did this on a CRT from an HP 250 a number of years ago. If I remember 
right, the CRT face is around 10"x12", so the shorter dimension's perhaps a 
bit less than a typical screen. I just used the 12V from a spare PC PSU 
that was kicking around (with a dummy load on the 5V so that it would 
regulate OK) and some resistance wire.

I'm afraid that I don't recall the wire characteristics - but there was 
just enough heat to do the job if I took things slowly (and that's likely 
preferable to something which would be faster, but could possibly be 
dangerous due to increased heat).

I suspect that something with a slightly higher voltage (~15V ?) and run 
via a wire-wound rheostat for control would be the way to go if you're 
doing this more than once.



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