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wrote: Gah! I wish you had posted that initially. My suggestions assumed store mode worked or at least that it and the readout lacked any display problems. I would help if you said where Q2105 is. The

Well now, that was interesting, swapping Q280 with Q452 (same type) initially appeared to make things slightly worse, but when I pressed on the top of the FET to straighten it up to get at one of the

Thanks for the suggestion. I have pushed on the connector. It did not help. Store mode is currently not working. I currently have Q2105 removed. I am awaiting the arrival of another scope to

Jerry, A scan would be much appreciated. Thanks for taking the time to do this! Aaron

Thanks for the info. From message ?#2894, which is a little history of Tektronix scopes, I found out that the TAS4xx series were made in Beaverton. Already figured out that they were the last

Hi David, The half period oscillation is normal. I would first test Q280 before bothering about a replacement type. They should be matched at Id about 1 mA each and Vds about 15 V. Is there any need

Yes, a slight inbalance I could understand - but +2.2V is a LOT. Yes you can see the ramp very nicely at 100nS/div. But regardless of the sweep speed there's a very clear problem here. As the ramp

Good Day, Gala, I am glad to hear that you are enjoying your TAS485. You might want to read over these messages, too: #3163 and #2894. I once had the "pleasure" to have a TAS250 on my bench many moons

Yes, it was the hybrid 155-0242-01. Fastened to its place and everything OK. A special thanks to Joe Mc Elvenney, G3LLV, who gave me one of those rare specimens! I just had to re-adjust the bias grid,

So I guess this thing is bullet proof, since no one knows about any quirks or issues. Well the scope is working fine, aside from needing calibration. It is amazing to see the technological progress in

Hi to Both and Others, I hope Jerry will made the scans of the Mod Ducument. Nevertheless in the search for the right Manual see below: The first one:070-432 or 070-0432-00 Type W (SN 100-6999) :

Hi Jerry, I think scans of the Mod Document are highly appreciated. Thank you. Egge Siert

Folks, I undertook the replacement of the batteries in my DSA 602 this evening. All went well, with the removal and replacement of all three batteries. When the scope was powered back up, things

Here is really good reading on troubleshooting an oscilloscope. It is a Tektronix document, of course! http://www.sphere.bc.ca/test/tek-parts/troubleshooting-scopes.pdf

Hi Magnus, You didn't "amend" my recommendation, you added to it. I agree, your recommendation would be the next step. Power supplies must work properly for everything else to work properly. Arden

I would like to be considered if the shipping is reasonable, please. ? -Don ________________________________ To: TekScopes@... Sent: Monday, January 23, 2012 4:56 PM Subject: [TekScopes]

As others have suggested, check the physical connections at the CRT before you do anything else. tom jobe...

Does the trace compress to the left with both timebases? For the part which is not compressed, is the timebase still in calibration? Unfortunately I suspect the problem is going to be somewhere around

Hi All, I have a 545A, 3 pre-amps (Types CA, K and L) and 1L5 Spectrum Analyzer all on a 500/53A Scope-Mobile with manual (incl. schematics) that I would like to give to someone who will truly

I've one but wont be able to retrieve it until Friday, as I work in another school district 80 miles from the homestead. To be clear, it is the one with the Lemo connectors, correct? As a matter of