2,359
edits
687-A: Difference between revisions
Jump to navigation
Jump to search
no edit summary
(Created page with "Type '''687-A Electron Oscillograph and Bedell Sweep Circuit'''. ==Specifications== ==Links== ==Photos== <gallery> </gallery> Category:Recorders and Dial Drives") |
No edit summary |
||
| Line 1: | Line 1: | ||
Type '''687-A Electron Oscillograph and Bedell Sweep Circuit'''. | Type '''687-A Electron Oscillograph and Bedell Sweep Circuit'''. | ||
<!-- | |||
https://www.ietlabs.com/genrad_history/genrad_museum says | |||
The 687 (announced in 1934 and designed by H.H. Scott and E. Karplus) was the last GR oscilloscope listed in a catalog. It contained a sweep circuit and power supply, but no internal amplifier. | |||
It was useful up to 130 MHz. GR decided not to make more oscilloscopes deciding that they were not precise enough for laboratory use and only useful in the radio service shop. | |||
Needless to say, that was a lost opportunity. | |||
However in 1938 they did make an advanced oscilloscope, the type 770, known as “Big Bertha”, but it was only used internally and never sold. | |||
--> | |||
==Specifications== | ==Specifications== | ||