test-drb March 2007

test-drb@ccmp.vtda.org

239 participants
488 discussions

I am now Annoyed [Re: Old oscilloscope help: ideas sought]

by dkelvey＠hotmail.com

>From: der Mouse <mouse at rodents.montreal.qc.ca> > >[replying to two messages in the same thread together] > > >> I was using a 40W light bulb in series with the primary, as a > >> current limiter, which is why the primary voltage was 25V instead of > >> ~120V. The bulb was glowing (not quite full power, but close). > > Well, even with a 40W bulb in series, I would expect a transformer > > with no load on the secondaries to give almost full output if there > > were not shorted turns. > >Well, yes - since it would be drawing (to a first approximation) zero >current. That the bulb glows at all with all the secondaries open is >to me a strong indication that something is shorted. > ---snip--- Hi That is not necessarily true. The transformer is an inductor and would normally draw quite a bit of current. It would be 90 degrees out of phase with the voltage across it but It is still current. It is current that makes lamps glow as well. To tell if the transformer had shorts, you'd need to measure the relative phase angle of the voltage on the lamp and the transformer. If it was 90 degrees, there was no short, just the open in the HV. For a quick check, measure the voltage across the transformer and then across the light. If these totaled together was greater than the measured line voltage, I'd say the transformer was most likely OK. If the sum was equal to the line voltage, it is surely shorted. Some 'oscope measurements on a dual trace would be more meaningful. Just the fact that the light lit is not enough to say that the transformer is bad or good. Dwight _________________________________________________________________ Find what you need at prices you?ll love. Compare products and save at MSN? Shopping. http://shopping.msn.com/default/shp/?ptnrid=37,ptnrdata=24102&tcode=T001MSN…

17 years, 9 months

Long-term storage (Was: Re: Google on hard drive failures)

by mtapley＠swri.edu

At 15:35 -0600 2/23/07, der Mouse wrote: >Certainly. And forget centrues; try millennia. The Pyramids. The >Sphinx. Stonehenge. The French cave paintings. Old Greek and Roman >coins from archaeological digs. At 21:11 -0600 2/23/07, Chuck wrote: >Heck, we've "manufactured" artifacts that will last for a hundred >thousand years or more. Just google "Yucca Mountain". Pikers. Try the Voyager record. *That* puppy is going to be around (somewhere) for some serious millenia. Or the CD taped to the New Horizons Spacecraft, seen below in on-topic format :-). Data retrieval, however, will not be easy. -- ______ Mark Tapley ------ Third Planet || SWAP 210-379-4635 Cellphone ---- _|__|______ __..---..__ | | \ _`-' ``-. HGA(REX) PEPPSI | ---- _' `-_ `-. | .' `-_ `. .-| , `-_ `. LORRI : | . `-_ `. : | / SDC `-_ \ '-|. below `-_ . _______ _______ |' .-*-. `-_ ||+|+|+|+| |+|+|+|+| | / \ `|--`-------------------| | ! o-----> +X | | | | \ | / _,|--.-------------------| |. "-|-" _,- ||+|+|+|+| |+|+|+|+| |' | _,- ' ------- ------- | ' V _,- / RTG (Radioisotope | ` +Z _,- . Thermoelectric | ` _,- - Generator) | `. _,- .' | '. _,- _.-' artwork: Lillian |__________',-__ __,,,'' Nguyen | | '' --- '' | | `-----' PERSI (Alice above, Ralph below)

17 years, 9 months

I am now Annoyed [Re: Old oscilloscope help: ideas sought]

by RodSmallwood＠mail.ediconsulting.co.uk

Comment from the UK Cathode Ray display devices such as TV, Terminals, Oscilloscopes etc. are generally refered to as "tubes" over here. 'Valve' is taken to mean the glass (or metal) enveloped switching or amplifying devices. Special devices such as photomultipliers are also normally called tubes. Rod Smallwood -----Original Message----- From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org] On Behalf Of listmailgoeshere at gmail.com Sent: 01 March 2007 12:58 To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: I am now Annoyed [Re: Old oscilloscope help: ideas sought] On 3/1/07, Chuck Guzis <cclist at sydex.com> wrote: > On 28 Feb 2007 at 19:00, der Mouse wrote: > > > Actually, come to think of it, looking at your (natural enough) use > > of "valve" where I'd write "tube", I'm curious - are CRTs called > > CRTs on your side of the pond, or something else (CRV?)? > > This has come up before--it's "tube" if I recall. The same applies to > terms suchl as TWT. > > The only difference is that some pronounce it "chube" ^^^^^^ "all". No-one British that I've ever heard pronounces it "toob". People would look at you funny if you did ;) Ed.

17 years, 9 months

what BS

by aek＠bitsavers.org

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160090821802 "After living and breathing my life working on DG equipment, I have put together an extensive set of manuals for the mininova, nova, Supernova, eclipse minicomputers life." How nice. It just happens to match the pdfs from a well known source. He's done this with other parts of the archive, but this particular add makes it sound like he actually did some WORK. At least the guy that's been selling bitsavers stuff in Israel puts the source in his ads.

17 years, 9 months

what BS

by aek＠bitsavers.org

> The only thing you might do to curtail this kind of "thievery" is to > "watermark" key pages of manuals on bitsavers. I don't care if people sell the files, what annoyed me was the implication in the ad that he did the work. I also see he points to bitsavers when he 'includes' a manual with a board http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160073926988 A few weeks ago, I bought an Applied Microsystems 8085 ICE 'with manual' It was a CD of my scan off bitsavers.

17 years, 9 months

Misc. stuff available for collection in Dublin, Ireland

by pcoghlan+cctech＠vms.eurokom.ie

Hello, Are there any other cctech members in Ireland? We are having a clearout at work and there is some old gear is going to be thrown out. If anyone wants it, they are welcome to come and get it. There are: One or maybe two VAXstation 3100s. Basic models - no model 76 or other high end ones. No disks. Should be working. Two VR299 colour monitors. (32kg each) One has no red on the display and a faulty on/off switch. The other is fairly ok. Two table top TLZ04 DAT tape drives. They both probably chew tapes :-( Some TLZ09 storageworks (green/brown) TLZ09 DAT tape drives. Condition unknown. Some storageworks (green/brown) canisters that once housed disks. Worked when they had disks in them. Some Decserver 200 terminal servers (8 port, LAT only) Some working, some power supply faults, some logic board faults. Two Dec DEMSB X.25 routers (with a few cables) Worked some years ago. Stored indoors since then. Two Satelcom Megapac X.25 switches (also with cables and manual) Seem to work. Not really sure what to look for though. A Livingston Portmaster 2e serial & ISDN "communications server" Faulty I think. Can test if anyones interested. A VT420 terminal. Dead as far as I recall. Can test if necessary. Maybe some other related bits and bobs. If anybody can take any of this, please contact me off-list. All are available for collection in South Dublin. I don't want to crate and ship anywhere as they are generally heavy, awkward and probably not of sufficient interest or rarity (although the X.25 stuff may be rare in some parts of the world, but I doubt if anyone's interested). Regards, Peter.

17 years, 9 months

Tek 7904 scope

by tpeters＠mixcom.com

At 01:05 PM 2/17/2007 -0800, you wrote: >On 2/14/07, Tom Peters <tpeters at mixcom.com> wrote: >> >>Hey all, >> >>I just missed out on a Tek 7904 scope (four trace) with four plug-ins for >>$299. Was that a deal? The plugins were 7A26 7A18 7CTIN and 7B53A. >> >>Looks like a 500mhz scope, but with plugins good for 200mhz and a curve >>tracer. >> >>Are plugins for that scope readily avaiable and reasonably priced? >> >>-Tom (my real name) Peters. >hey, since the listing should be over by now (since you said you won >it)...perhaps you wouldn't mind sending us a link to the listing so we can >all drool over exactly what you got? :P :D :) Sure, absolutely. The item number originally posted for $299 has been lost. The relist at my price is below. Try not to drool on the knobs- they get slippery and hard to adjust ~(:-) that's me with a feather in my cap. Item number: 330089349032 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=014&sspagename=STRK%3AMEWN… 'Tis an ill wind that blows no minds. --... ...-- -.. . -. ----. --.- --.- -... tpeters at nospam.mixcom.com (remove "nospam") N9QQB (amateur radio) "HEY YOU" (loud shouting) WEB ADDRESS http//www.mixweb.com/tpeters 43? 7' 17.2" N by 88? 6' 28.9" W, Elevation 815', Grid Square EN53wc WAN/LAN/Telcom Analyst, Tech Writer, MCP, CCNA, Registered Linux User 385531

17 years, 9 months

OT - cool space photo available

by chrism3667＠yahoo.com

If anyone is interested, I have a photo someone sent me of this: "...a time lapse photo of the ROPA (40.020) launch where you can see the aurora in the background and all four stages." Still haven't set up the ol' website, so I can't simply post it there. If anyone would like me to forward it to them, ping me. Really groovy stuph. The wonderful human being who sent it to me was actually involved in the launch, in some capacity. I might not be forwarding it out until the next time I'm online. Prolly Monday or Tuesday. ____________________________________________________________________________________ It's here! Your new message! Get new email alerts with the free Yahoo! Toolbar. http://tools.search.yahoo.com/toolbar/features/mail/

17 years, 9 months

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test-drb March 2007