open hardware sampler oscilloscope development video by Ted Yapo mentions Tek many times.

John Griessen
 

https://www.youtube.com/watch?v=99u53V7uDFY

Mentions S-4 sampler, 11801 with SD24's along the way

BOM cost of system he has, (not including various DC supplies), is < $100 for about 7GHz bandwidth.

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