Re: I'm old 70+, the 70K system is old; good or bad omen?
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Thanks Harvey, ? My mistakes see my other apologies. ? Regards Gene ?
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From: [email protected] < [email protected]> On Behalf Of Harvey White Sent: Tuesday, November 23, 2021 8:20 PM To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen? ? Many of the typical capacitors with metal cans have more than one ground lug, arranged in a circle.? The lugs are, IIRC, only for grounding and mounting stability.? On the capacitors I've seen (not the two lead ones), inside the circle formed by the case mounting ears you'll find the hot lead of the capacitor.? If you remember the dual capacitors in tube equipment, the hot leads should be inside this circle as well. One thing to note (for instance, in the 468 series scope), the case can be used as a jumper to tie grounds together.? The little adaptor plates often have ties to a common ground ring, even though the replacement capacitor only has two leads.? You may have to run a wire from ground lug to ground lug if they are not obviously visually connected. Harvey ? On 11/23/2021 11:03 PM, Gene Silvernail wrote: Thanks Kuba, ? Yeh coming from the era of tubes I had assumed a dual cap¡so much for assuming. Now that¡¯s starting to make sense with the single component designator, but leaves the question which 2 out of the 3 leads make up the capacitor and what purpose does the third lead serve. Is it a non-electrical, mechanical only? I¡¯m working without a schematic even though I bought the CLIP from Artek which is minus the PS board. ? Pre-Thanks ? Gene/K7QHO ? ? My assumption would be that the number of legs has not much to do with anything: it¡¯s a single capacitor each with 3 or 4 legs. Very common in that era. I¡¯ e got lots of contemporaneous Tektronix equipment that has the same capacitor styles. The double and triple electrolytics were a thing in the vacuum tube era. ? Thanks Paul, ? Just got the component location PDF on the site which provides me the PS cap numbers; also ordered the 70900A CLIP. However, looking at them I¡¯m confused further with the 3 leads. Only 1 component number associated with a dual capacitor¡huh? Hopefully the schematic will clarify this. ? Regards ? Gene ? ? Hi Gene
sorry made a mistake the 3 legged caps are on the Vishay N -cap ?and can be found on the hp 70000 groups
site. Regards Paul?
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