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In good working condition Tektronix processor board for TDS644A oscilloscope. Part number 671-2413-00. The firmware version is 3.8.5e.
Contact me if you have any questions or not sure if it is compatible with your scope.
Tektronix TDS 644A Color Four Channel Digitizing Oscilloscope 500 MHz 2 GS/s
$599.99
Tektronix TDS 644B Digital 500Mhz 4CH 4Channel Digital Real-Time Oscilloscope
$599.99
Tektronix TDS460A 400 MHz Oscilloscope
$175.00
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