Re: multi-section cap for Tek 4006
There are the old radio guys who seem to hoard NOS caps. You may want to check these guys to see if they have something that might fit: https://www.vivatubes.com/ https://www.justradios.com/ Personally, rather than depend on the condition of a very old electrolytic, I'd probably rebuild "in the can" with modern stuff. Unless you're taking about paper-in-oil caps, I wouldn't be very sanguine about really old stock--they have a tendency to dry out even in storage. --Chuck
Re: multi-section cap for Tek 4006
> On Aug 18, 2019, at 1:52 PM, Al Kossow via cctalk > wrote: >> Rebuilding cans is a common practice now, since they are LONG out of >> production. > https://www.nmr.mgh.harvard.edu/~reese/electrolytics/ Thanks, Al. This is definitely plan B, unless somebody here comes through with a miracle "oh I have those...", or "there's a pile over at X...", or "they're also used in Y so look for one of those." (Don't know until you ask, especially around this crowd :-)) cheers, --FritzM.
Re: multi-section cap for Tek 4006
On 8/18/19 1:51 PM, Al Kossow via cctalk wrote: > Rebuilding cans is a common practice now, since they are LONG out of > production. https://www.nmr.mgh.harvard.edu/~reese/electrolytics/
Re: multi-section cap for Tek 4006
On 8/18/19 1:17 PM, Fritz Mueller via cctalk wrote: > Any part-sourcing gurus out there able to steer me in a good direction here? Rebuilding cans is a common practice now, since they are LONG out of production. It is just tedious to do. There are a few people who make them, for example https://hayseedhamfest.com/products/
multi-section cap for Tek 4006
I'm working my way through a Tektronix 4006 terminal purchased of eBay right now. First stage is the low voltage power supplies, and I noticed right away that one of the multi-stage electrolytic filter caps there was running quite hot (this was with downstream electronics isolated, and a 40 ohm dummy load on the +20V supply per recommendation in the service manual.) The cap in question is a multi-section Mallory can, 150@400 / 150@250, used to filter the +185 and +320 unregulated supplies. It is C395 A/B on the schematics, Tek part 290-0549-00, Mallory part 68D20193. This terminal is so beautifully engineered inside that it would be a real shame to replace this with some sort of ugly bodge. Any part-sourcing gurus out there able to steer me in a good direction here? I have found the part listed in the various online NSN aerospace cross-referencing sites, but haven't bothered to ask for a quote from any -- I'm guessing cynically that "RFQ" + "Aero..." = 5 zillion dollars for one piece... :-) Has anybody here used one of these sites successfully? cheers, --FritzM.
