The 501 is a single slot, 500 series compatible case and power supply.
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The SK25 is a discrete Op-Amp that is pin compatible with the 2520 and "99" DOA's.
The SK99 is a discrete Op-Amp that is pin compatible with the 2520 and "99" DOA's.
This screwdriver has a recessed head at one end which prevents it from sliding off the trimmer potentiometre head you are adjusting. Very convenient when you are working inside your lunchbox.
