Try an octopus circuit with your oscilloscope. --Eric Sent from my Samsung Galaxy S8.

HankC, The 7T11 does indeed have a second "Random Sampling" mode, which is very different from the regular mode and more difficult to adjust and use. The dots on the screen are sequential (otherwise,

Ed No, not quite. I don't have a curve tracer. The current practice is to replace ALL the audio power transistors in the output circuit in one shot, discarding the faulty ones, along with the

Do you mean that you can pull a transistor that's apparently failed in-circuit, and it tests out normal on the curve tracer, but if you put it back in, it still doesn't work? What happens if you pull

I have a complete set of Concepts books, including the one on sampling, which I have read cover to cover several times. But random sampling on the 7T11 is even worse than sequential sampling

This is an issue which has been cooking in my thoughts for a while. On older discrete power amplifiers, which have suffered failure, the main power transistors test OK on all usual devices, when

You nailed it. you beat me to it. I did attribute it to a mistake but it is not. I am too aware of mistakes on prints, thy occur quite a bit in consumer. You see a wire that says 12 volts and then a

IIRC, the 7T11 has a Random Sampling mode; the dots on screen are not sequential. Instead, the sampling window is intentionally jittered horizontally. This allows you to see the trigger point without

Dennis, I don't fully agree with you on this, Dennis. Whereas the 7S14 behaves almost exactly like an analog 'scope, as you describe, the 7S11/7T11 behaves very differently. Although it (actually,

Geeze... I am such a crazy guy... don't worry about the rar download link, lop pol.  The link is a scan of my manual, in color and 20000 and up.  Just what I needed.  Sorry for the silly

I have a 20000+ 453 and would appreciate that download or a link... Thanks, Phil

Yes, Dave, that is sort of what I meant. In my description, I meant to indicate the ultimate goal, which is to show the vertical signal on the crt long enough after the triggering event but maybe I

Regarding the differences between the 7S14 and the 7S11/7T11: As near as I can tell from using the 7S14 extensively, anyone familiar with any very common dual trace dual timebase Tek product would

I question one point, Raymond. The 7S14's delay line delays the signal long enough for the rising edge to hit the sampling gate - not the CRT - after the trigger. That's what you meant, right? Dave

The 7S14 is specified to "only" 1 GHz. It's very much easier to make a low-distortion (amplitude, phase) delay line for frequencies up to 1 GHz than up to say 11 or 14 GHz, which is where the 7T11 is

On my schematic BA and BB are shown right on the edge line of the board. They look like they are connected together but are not. BB goes to ground and to the shield of the coax that goes from R1274 to

Has also been recently scanned here: http://chiclassiccomp.org/docs/index.php?dir=%2Ftesteq/Tektronix > > >

People misinterpret things all of the time. And people use their test equipment wrongly quite a lot. I am not saying that is happening here, but it feels like it might be. If BA is truly at ground,

Why would either BA or BB be a dead short (at ground) to Q1274's emitter? There is a 2.19K resister between the emitter and either BB or BA.  I guess what I'm missing is how someone could see a short

Chris, Dennis, I wondered why the 7S14 had the delayed timebase and Vernier control of the delta-delay markers but this was omitted on the 7T11. There could be several possible reasons and Dennis may