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Strange that nobody responded, summer vacations? I was really hoping to hear about this, I currently don't have the 7S11/7T11 but I'm considering getting them. What I do have is a 7S12 with S-4 and

Dave, I may have spoken too soon. I started to think more about the DC509/DP501 relationship and looked into a couple of other TM50x power modules I have here and was quite surprised to find that the

Hi Chuck, Yes I'm curious, probably easy to do. Raymond

As the proud owner of both a 7904A and a 7104, I can attest to this concern. Fortunately, my HP 8664A sig gen provides the perfect spot for the 7104 to rest in the corner of my benches, where I don't

For a 7104, I'd think about carrying it from the bottom, but that said, I've never done it, nor have I ever heard of one of the 7K straps breaking (unlike the 500 series, which are mostly broken, or

Looking at your precise ripple values gives me the feeling that you simply measured them using the AC(RMS) function of your DVM. If that is the case, the true P-P ripple is more like 2.8 times the

Hi Raymond, I agree that C4403 needs to be investigated. It will be a week, or so, before I have any parts in hand to try. C4403's intended purpose is to make moving changes to the focus as the trace

Hi, there is a peculiar property with emitter followers and FET source followers. Under some circumstances they will provide a negative input impedance. This with a certain source impedance will start

Thanks for the reply, Chuck! Here are the power supply voltages and ripples, as measured at J119: -15 measures -15.001 V with 0.99 mV of ripple +5 measures +4.991 V with 33.86 mV of ripple -15 UNREG

There are a lot of retired Tek, HPAK and other T&M company employees on these lists who doubtless know others who are not on the lists. Do you have or know people who might have unreleased

I wish it were so simple as a ground lead. If you put the probe tip on the scope calibration ground, it still oscillates. I tried all of the combinations of direct leadless ground connections to the

table. And every time I get shivers in my feet. Nenad Well with age of any metal I would be concerned. At 46+ lbs. The one I used to own was on a Tek cart. Which saved my Back and Feet. I think

Well I suppose this sounds silly, but I just can't get over it. This thin metal sheet inside the handle is surely tough, high tensile strength steel, but somehow subjectively it doesn't nearly impress

https://m.youtube.com/watch?v=9lmAQUjs_cE - This link has some tips on TDS 460 power supply repair. You may find them useful. https://m.youtube.com/watch?v=pffOJdCQ7kw - This is a tutorial on SMPS

Thank you Michael. In my experience, usually 2 things that affect the SMPS are, the "bootstrap" or startup pulse generation or the output feedback loop i.e. optocoupler - "Control pulse". Warm

Thanks for the info, Greg! -Dave

Thanks for the help Bruce. Pins 2 and 3 of the op amp are about 3 volts apart. The pass transistor appears to have a short between collector and emitter. I’m going to order a replacement. Should I

Does anyone know the official part number for the cover used on the Tektronix 492/496 Spectrum Analyser? Gary

Steve, Excellent Information. As you can probably tell, I am quite the novice, especially when it comes to SMPS operation. My limited knowledge of SMPS told me that they must be "loaded" in order to

Ravi, Certainly. I will post in the PHOTOS Section shortly. I have Tried to get some good photos for your reference. Feel free to contact me off list with any questions. Sincerely, -- Michael Lynch