Heathkit OL-1
1954
The Heathkit OL-1 oscilloscope was the first Heathkit to use a 3" CRT using a 3GP1 tube. It was sold for 2 years from August 1954-56 for $29.50. More documentation and schematics for this oscilloscope can be found at Heathkit OL-1 assembly and user manual on archive.org, and also Heathkit OL-1 by w6ze.org.
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Jon Stanley