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GeoSei
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Re: Part III: Chips & Packages
GeoSei   7/25/2012 3:11:45 PM
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Max,

My first Frequency Counter designed by Hewlet Packard had at least 50 vacuum tubes. Each digit was repsented by a vertical column of neon light bulbs labeled 0 thru 9. I believe it went as high as 10 Mhz.

After it died, I discovered that it had a temperature controlled oven with a 100 Khz Crystal inside for the time-base and also several diiodes used for other purposes. I believe it was one of the first counters made using combined solid state and vacuum tube technology circa 1956 give or take a few years. I purchased it in 1976 at a local school rummage sale for just $5.00



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