Re: From 2014: Tektronix Announces Winner of Europe’s Oldest Working Oscilloscope Contest

Chuck Harris

I plea guilty to my brain spontaneously emitting gas about the "D"
being for Distributed. It was, of course, an indication of the delay
line, that allowed you to see the triggering signal.

The 513D, however, announced back in 1949 had a distributed vertical
amplifier containing a host of 6CB6's. That was at least two years
before the 517 showed up in the catalogs.

-Chuck Harris

Dave Wise wrote:

That D suffix indicates Delay line, not Distributed amplifier. (So you could view the edge that triggered the sweep.) Tek's first distributed-amp scope was Type 517.

Dave Wise

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