M694
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The Tektronix M694 is an amplifier monolithic integrated circuit designed by John Addis.
The M694 is an M377, just with a more relaxed specification for DC balance.
An M377 that doesn't quite meet its DC balance spec can be a fully acceptable M694. This was used as a cost-cutting technique for applications that don't require tight DC balance.
The M694 is used as the output amplifier in the AM503A and the AM503B. (165-2456-00)
The 11A16 dual-channel current probe amplifier plug-in 11A16 uses the M377.