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On Sat, Aug 11, 2018 at 05:29 PM, tom jobe wrote: > > Hi Leo, > Yesterday I found the Fluke thermocouple and did some tests on a 2215A. > First I disconnected the optional fan, then let the scope run

Hi Leo, Yesterday I found the Fluke thermocouple and did some tests on a 2215A. First I disconnected the optional fan, then let the scope run with two traces like you did. The temperature of the

Thanks for the info morrios , do you have anything points that you think will help in this process ??? Things to pay attention to.? On Sat, Aug 11, 2018 at 5:22 AM, Morris

I don't currently have Instrument Reference Books for any instruments later than the early 1960s. If I find them, I will scan them and share the scans.

Are all the low voltages correct?

I have uploaded scans of the hv transformer drawings to a folder in the Photos area called (not surprisingly) "556 high voltage transformers". Good luck! Morrios

I have the Tek specification drawings for both the 556 HV transformers - I'm not sure if they're in the group files but if not I'll upload them. When I mentioned a jig, what i was referring to was a

hey all,i have a 464 with no crt display.front pannel lights work. i have the service man..wow what a book ! Any comon problems causing crt not to light?

I see you are very busy with the Reference Books Kurt so thanx for that. Are these books mainly about the "older" stuff from about the 1950 - 1960 era or made Tek them also for say the 547, 647a and

Could somebody forward this to the OP e-mail address, Tim Phillips (UK), please? Can't see it in the archives, as it's obfuscated by groups.io. Hopefully, at least the group moderators can see it, and

(continued) typo, C4399 is at the +15V rail.

Hi Tomas, Since I was just curious what my 7704A would show I took off the upper side panels, attached probes and switched on the 7704A. A big very bright dot illuminated the center of the screen. At

Hi all, Hi Tom, I tested for temperature this afternoon again, after I performed a full calibration on the scope. So, the scope had been running for several hours when I did this measurement. I used a

For as long as I have been a member of TekScopes there are two things I have heard regularly from our members outside the US: It costs too much to ship classic Tek scopes outside the US and they ae

Be careful when making changes to the operating characteristics of the switching parts of a SMPS. Faster tr and tf can improve efficiency, but can aggravate PS noise and cause EMC issues. Ed

Hi Leo, Could you give me the conditions under which you tested your Q9070 FET for the temperature, so I can get you an accurate temperature number to compare to a working 2215A here? The recent

Here is the Type 60 / 2A60 Instrument Reference Book: http://w140.com/tekwiki/images/0/0e/Tek_type_60_irb.pdf

Hi Leo, Thanks for your feedback / experiments :-) About the fan, easiest is to use a simple fan without any electronics in it to begin with ;-) A standard two wire fan, or a 3 wire fan where you just

Hi all, here is my follow up on the FET replacement in my 2215A, and the adding of an optional fan. Using a P9NK70ZFP (the working one I started with) gave a FET housing temperature of 68 degree

Timothy, The AFG 3252, for square waves, is spec'd for a time equal or less than 2.5ns, which is good enough to calibrate a 25MHz scope (which has a risetime of 14ns). But it wouldn't cut it for a