开云体育

Check that all socketed transistors are well seated. My 503 had a dropout that was corrected by pushing a transistor back into the socket. If I recall, the component in question was near the front of

I think the modules in the racks look a bit too complex to be digital modules. Perhaps its not a digital computer but an analogue one? cheers Martin

<davidpinsf@...> wrote: Interesting picture. It looks like they're working on a valve/tube-based computer of some sort, and there's an odd mixture of technology in use. What look like

From Tim P (UK) Early computers, such as Colossus, EDVAC, EDSAC, Whirlwind etc. were built on open relay racks. I wonder if the photo shows a reconstruction, or 'working model' of an early machine.

Great find. Few pictures of these actually performing their job in a real environment. <davidpinsf@...> wrote:

Hi All, Thought folks might be entertained by this picture I found. Currently helping my wife with downsizing her mothers household. Came across this book:

Dom, The filament windings can be left on or taken off. Check the high voltage when they are replaced. Clean the high voltage area to remove dust, dirt, etc. to eliminate leakage paths, if you have

Eric, if I understand correctly, the board you are making for the 7854 isn't a replacement for the 067-0587-xx boards, but something to do with the digital capabilities of the 7854, is that correct ?

Andy, if you need lots of pictures of the cal fixtures let me know I have a -01 and -02 here in the lab. I am also in process for a test board for a 7854. I had a unit arrive today.... destroyed by

Glad it was something so simple and cheap to fix -- just a 555 instead of some left-handed unobtainium hydroxide. -- Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way

HI Mark, Thanks for your advice. I can see the one's you're talking about on fleabay- they're certainly a good price. I'll be replacing all five because I'd imagine the corrosion that ate through the

Hi Mike, That's terrific- certainly a lot cheaper than the diodes from Digikey. I hadn't seen that site before and it looks like they have some great stuff! I'll have a browse now and I'll let you

Quick update to close the loop. I went through the components related to the NE555 timer and concluded that it was, indeed, a dead IC. I injected a 20.48 kHz signal at the output of the NE555 and the

I have a 7904A, that I intend to keep in good working order. However, I've not seen many cal fixtures on the market and reckon the prices are only going to go in one direction for the near future. I

Greetings, Just FYI, both of my Ibico punches are combination machines. One has an electric driven punch the other is manual. Both have a section on the top of the unit used to install or remove the

Get the comb binding punch and the installer as well. Two pieces are necessary. -- Michael Lynch Dardanelle, AR

Get a Comb binding tool if you can get one cheap. -- Michael Lynch Dardanelle, AR

re: multiple copies, yeah Dave, it can get pretty bad pretty quick! My wife has an easy solution. I can have as many manuals as I can fit in one double drawer file cabinet. :-) For my part, sometimes

Why would one want multiple paper copies of a manual? I copy pages (mostly schematics) when I want to annotate them while troubleshooting, but I have eight file cabinet drawers of manuals. Having

Remove the comb and put it in a 3 ring binder? I've seen manuals from other manufacturers where they show a picture of what the manual will look like but when you get it it's actually in a 3 ring