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Be prepared for more requests David, several other pages are missing as well ;=). Albert

I'll email it directly in two seconds, since attachments tend to be dropped from the mailing list. I just scanned the two pages into one tif file. Chopping it up is left as an exercise for the reader.

Hi David, that exactly what I am searching !!! Herbert Am 21-01-2013 14:00, schrieb David Holland:

6-21 contains the section "Observing the waveform memories at power-up" ? If so, I've a dead tree copy I can scan.....

Hi all out there, in all the manual copies of the "Using the Waveform Calculator - 7854" available on the web the pages 6-22 and 6-23 are missing. Does somebody have a paper version and can scan those

Hi Bogdan, it is normal for the HM62256B to keep the data down to approx. 1V. I think what zou see is, that the system does not recognnize the power off phase . Herbert

Hi all, After replacing the ROMs (document to come soon), I got on to the RAM. Replaced all 91L24 chips with 2x HM62256B (that's all I had at hand), thinking to first try out the simple SRAM and then,

<daviddigiacomo@...> wrote: Tektronix's choice of the 2N918 to replace the 2N3605 was bothering me so I did some research and then some tests on my 185. I had to dig out my National discrete

I think those general purpose parts are a bit too slow to be good substitutions. I would try something faster like PN918, PN2369A, PN4275, 2N5770, MPSH17, etc. Everyone should have at least one of

Thanks Victor, interesting thread. If it is humidity based then I'm glad I live in Arizona. Seams like leaving them for a long time packed in silica gel might also help. Interesting in any event. Jeff

The ones I purschased are from a 100% feedback US Ebay seller. Listed as made by Phillips, NOS, Item pictured. I really do not think they are fake.

Everybody counterfeits everything. Anything that sells for 3 cents a piece in bags of 100 is fair game for counterfeiting. The crooks pump this stuff out by the millions, and make their nut by

It may fix some of the U800s that have failed: http://tech.groups.yahoo.com/group/TekScopes/message/83240 Please search this forum: "U800 baking" This has been discussed ad nauseam. --Victor

Has someone actually counterfeited 2N3904s? How desperate did they have to be?

I am not sure why Tektronix listed the 2N918 as a replacement for the 2N3605 and I even went back and confirmed the specifications. My guess is that it had something to do with storage time,

I hope they're not counterfeit .... You should test a few to see where Ft seems to be. 73 Jim N6ITQ

Removing the heat from the plastic should in turn drop the temperature of the metal fin some. Now does that produce undesirable thermal shifts, no idea. In my case I'm pulling heat from a little of

Last time 'round on this topic I designed a heatsink that contacts only the metal tab parts of U800, not the plastic body. This is the intended (I think) means of getting the heat out of the chip. The

Well, I just ordered a bag of 100 2N3904's for $4. Hopefully all goes well B

33 PN918's @ 0.33 each would be only 11 bucks, so why again would one substitute if an exact/jelly bean brother (PN918) part is available? Far too many times have I seen someone chase down a problem