Generally, another ground with intentions of stability.? When replacing with a two lead capacitor, make sure that both grounds are shorted together.? Tek often used the two leads as a ground jumper.? Leaving that off gives lots of interesting errors.
Harvey
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On 4/19/2025 7:45 PM, Jay Czaja via groups.io wrote:
I got to sit down with my 2247A this afternoon and have come to the conclusion that above all else, the power supply needs some attention. All of the LV supply rails, with the +7.5V rail being the only exception, are measuring slightly above or just at the max of allowed ripple.
If I have time tomorrow I'm going to completely remove the power supply and figure out what I need to order. I'll probably use Panasonic FC series caps as I've had good luck with them in other projects and probably have at least some of the values on hand.
BTW, is there a definitive answer as to what the 3rd lead on those Tektronix electrolytics are? I did a few searches but haven't found anything conclusive. Mechanical stability?
