Heathkit ET-3400 red filter material?

gordonjcp at gjcp.net gordonjcp at gjcp.net
Fri Sep 9 04:30:32 CDT 2005

> As I restore this ET-3400, I am curious if anyone knows what kind of
> filter material Heathkit provided that sticks to the TIL312 7-segment
> displays?  Mine have 4 of 6 displays covered, and 2 displays bare.  It
> seems to be some sort of adhesive red tape or film, but I have no idea
> what to use for a modern substitute.
> Thanks for any tips.

Take it to your friendly neighbourhood theatre geek, who will be able to
supply you with gel swatch books.  You can probably find a bit of scrap
red gel that's close enough.


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