In article ,
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Ralph Farr wrote in message

Thanks for your reply Jim - I had never thought about using LED's but
that is something I would definitely consider now.

Ralph

Sorry on the mis-type of your name.

The control chip is, apparently, National MM5387AA/N

Can't vouch for the source, but here you go:
http://www.chipdocs.com/pndecoder/da...MM5387AAN.html

Jim

Thanks everyone for the replies - it has been a very interesting
discussion. I do like the vintage light bulb segments, but it would be
great to improve reliability. I was thinking about possibly using clear
white LED's to replace the bulbs. I haven't worked with any white light
emitting LED's - are there any as bright as a miniature incandescentt
lamp or would it take several to equal the same brightness?