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Stephan has the right idea, David. 1/4 inch dia. ceramic coated .01uF 100V ceramic disks are very common (at least over here). The ceramic easily chips off to expose the blobs of solder that attach

Folks, I scanned the 121 manual and the PDF file is here: http://w140.com/tekwiki/wiki/121 There is a scan on BAMA of the same document, but that scan is cut off in a couple of places. As always, if

Joe, Perhaps a good moment to tell whether your 7T11 indeed had a trim cap problem? Or was it another fault that would be good to know about? Albert

David, Try searching "7T11 Failing Trim Caps" in the archives. This contains information on shifting trace problem. Joe

Yes indeed, the 2220 is virtually identical to the 2230 in most respects - just a notch down to fill the price v. performance market position at the time. The 2200 series models share the same basic

In equivalent time, sequential mode, the trace is shifting left as I rotate the time/div knob. All measurements were made on the 50nS sweep range with the timebase triggered from Pulse Out. Looking at

When I was searching for a replacement channel swtich, I found that a number of the 22xx series oscilloscopes have the same main board which has the power supply including the 2213A, 2215A, 2230,

Hi Tan, Some one told me that the 2220 is the 60 MHz version of the 2230 100 MHz scope. If this is true, the 2230 manual might be your best bet. It is available from several places including:

Personally I would see what can be done with SMD or removing the epoxy and leads from a leaded capacitor. ST <david.partridge@...> wrote:

Drats - I meant to type 10nF Regards, David Partridge

Oops that should 1nF - not 10pF Regards, David Partridge

As reported in an earlier post the metallisation on the top surface of the leadless capacitor C816 on the trigger board came off when I unsoldered the arming and output TDs in my 7T11. I've improvised

Tan: ? ? ? ? I beg your pardon, I did not realize that you definitely do have the basic skills! ?But do buy or build an ESR meter, as a great number of ?problems are caused by defective

Thanks for your answer. Pertaining to the voltage measurement on R907 but I still need to know what to expect to know if an overload has happened. Nothing usually hot, other than the common heatsink

Why put an ammeter in series with the resistor? Just measure the voltage across it and do ohms law. If you are not certain of the resistor value, lift one end and use your ohmmeter to check it. Does

Thanks Gary, Do you suspect that it's a cap ESR issue? Why would it cause such a behaviour? I believe you can infer a lot from the behaviour than blind guesses that's where I am trying to tap from the

David, I agree with Jerry---You don't need an isolation transformer to work on this scope. T801 provides all of the isolation necessary. I still beleive that you need to concentrate on the +50V

Thank you Tom for taking the time to point out specifically the likely cause of the problem. I know it takes effort to go through the details and I really appreciate it. Just to let you know where I

Congratulations, Achilles. Great to hear that Q180 was the "fuse" and not Q190 which probably would be much more costly to replace, if a replacement could be sourced. Patrick Wong

Folks, The Tektronix 108 manual is here: http://w140.com/tekwiki/wiki/108 Here is a list of manuals that are needed, but not available: http://w140.com/tekwiki/wiki/List_of_manuals_that_are_needed If