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I picked up a barn find and the 7B92A looked in good shape until I spotted U244 - a dual op amp MC1458N 8 DIP | I picked up a barn find and the 7B92A looked in good shape until I spotted U244 - a dual op amp MC1458N 8 DIP: | ||
<gallery> | <gallery> | ||
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From the service manual: | From the service manual: | ||
<blockquote> | |||
Internal Source (SN B070000-above). When the Delayed Trigger Generator is using an internal trigger | |||
signal, the internal trigger signal from the vertical channel of the oscilloscope is connected to the Delayed Trigger | |||
Generator through J250. Signals above 30 kilohertz are coupled through C246 to pin 14 of U274 . (Pins 13 and 14 of | |||
U274 are internally connected.) Signals below 30 kilohertz are connected to amplifier U244 through R257. The output | |||
of amplifier U244 is coupled, along with the offset from the LEVEL control, to pin 1 of U274. | |||
</blockquote> | |||
are connected to amplifier U244 through R257. The output | --[[User:Qfissler]] 15 Oct 2023 | ||