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(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

I'm mostly curious how you determined if the wound coil was good without installing it inside the scope.

Or support for board? Den tors 9 aug. 2018 18:40Jeff Urban <JURB6006@...> skrev:

The focus control perhaps ??? Maybe that's where I saw one.

Fine and good but watch what you plug in together. ALot of iron can be dangerous. At first glance you think OK, inductors in parallel so less kick but that is not so. That means the total current

I've been loosely following this topic with some interest. From a simple wear perspective, I use an external power switch for my equipment because of the older equipment I own and the difficulty of

I have the parts to build a winding machine if necessary. What did the test jig look like?

Morris?Can you get the info on wire size and turns required to rewind transform from your friend that did them , was thinking of trying to rewind my 547 and 556 in case my 556 hv went down , thanks .

Jeff, the meaning of a suffix after the model name and of the Options is given in the catalogs. For instance, catalog 1987 says a 2465A CT is a 2465A with Option 9 (GPIB) and Option 10

From bitter experience I can confirm that both HV transformers in the 556 are prone to the thermal runway problem that has been discussed here ad nauseam with regard to the 547 and some other scopes.

Possibly counter timer?