I am having trouble imagining how a 15V CMOS device could spontaneously generate 5V on one of its outputs.... I can see ~0V, or ~15V, or even 7.5V, but 5V is an odd value for a device that has no

Thanks Harvey, going through some family things right now, but hopefully I can get to looking at the scope this weekend.

Thanks Siggy, I appreciate the pointers. Nice “outer limits“ clip as well! BTW, the fan runs fine.

There are some tests you can do with a partially working scope, but you are going to be very limited. 1) assuming horizontal sweep problems, you use an external ramp or the "other" sweep if you have

This one did fail the truth table check when it was in the device. VCC is about 15V which means a HIGH is 15V. Output 3 has a 5V output and does not move from there. When it should be high it is at 5V

Just out of curiosity, mosaicmerc...Where are you? ---8<---Corte aqui---8<--- http://www.tabajara-labs.blogspot.com http://www.tabalabs.com.br ---8<---Corte aqui---8<--- Em dom., 5 de jan. de 2020

I received a verified-working Tek 454 scope from eBay, and it seems to now, after shipping, have an issue where the CRT is incredibly bright, like we're talking burn-a-hole-in-your-vision bright.

Hi Greg: Although obviously I am privy to very little information about what the "military" has, or does not have... I am doubtful, if the military keeps any vacuum tube type equipment because of

@mosacimerc - scrapping a working 2465 seems like a waste :( Why break a fine scope for a speculative fix? I'll wait around a for a week or so - so people have a chance to come back from holidays etc.

Despite having less and less room, if I was near you, you would have a customer! If you can't sell it, donate it to a club or school, church or other places and have a great feeling about helping

I have a couple working 2465s i don't use, but I am not in Continental USA...so I could maybe scrap out a m'board from 1

Whoa Nelly, where did I say that ..."vacuum tubes are history"... ?? Not in this shack where I have in the AM station an Elmac AF-67 and Halli SX-117 in daily use. When I feel "continental", I fire

I had a University EE Summer Student who did not know how a tube worked so I broke a 6SN7 and showed him the parts. He then said tubes were no longer used so I asked him what he thought was in our

That is not correct. CD40175 and 74C175 have the same pinout.

Hi Greg, That is less likely than you think. Almost since the beginning Tek has designed its circuitry using what is known as a "Long-Tailed Pair". One of the features of this circuit design is its

Hi Richard, It may seem that vacuum tubes are history but nothing could be further from the truth. To my amazement I have sold almost 200 of my little VTCT Adapter boards. That really surprised me.

Hi Eric, Now that you mention it Tek had something like this. It is in the 1994 catalog on pages 414 and 415. It is called the Semiconductor Workbench. I just came across it for the first time and

Arden, You are correct. I have an extensive catalog of older documents and catalogs. I find the posts that I read something of a study starter. This gives me a starting point, then I dig into the

Watch out! The CD and 74 pinouts are different. You don't what to hack up your circuit board. Also, be advised, when troubleshooting IC's in general having the schematic of the device gives

Hi Mike, 99% of what I know about IC's and logic families is from reading the detailed information in data books. Keep looking for older data books to add to your library. It will enhance your