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Ok, here's where I'm at. ALL of the electrolytics, except the two big ones in the back, have been replaced. I tested them and they were all good with very low ESR so I'll toss them in a box for now.

I am having issues with a 2445 Oscilloscope that is not showing the A horizontal sweep. The “B” sweep appears when the B delayed time base is used. The readout shows some dots on the bottom line

I believe I've narrowed the issue to the probe tip, as you've suggested. Seems hitting it with a shot of cold air will calm the oscillation for a short period of time. The probe tip seems to be an

You're of course absolutely correct about the numbers in my example, Bruce. My approximation is only valid if R >> 1/(2 * pi * f * C), in which case R as a parallel R may be ignored. In my example it

Wrong, when calculating the impedance of a parallel R +C the 90 degree phase shift should be taken into account. The input impedance is actually closer to 550 ohms. Bruce

At higher frequencies the P6249 is a lighter load than the P6158, not because of its 20 kOhm parallel resistance vs. the P6158's 1 kOhm, but because its input capacity is significantly lower (< 1 pF)

There are a number of tricks.? One is to put a current limited supply on the +15.? Adjust the supply to +15 volts and the current limit to roughly between 50 ma to 100 ma.? Look for the lowest

Frank, Ray, I recently needed to measure some 600 MHz clock signals and the folks I was working with were not convinced that probe and scope bandwidth was so important, so I came up with this data.

To reply to my own message again , the TDS3PRT printer I purchased from an overseas seller arrived yesterday, but without instructions or accessories. Upon examination I found the platen knob to be

The only non-Tektronix scope that can accept Tektronix letter- and 1-series plugins is the Lavoie clone AFAIK. http://w140.com/tekwiki/wiki/Lavoie_LA-265A

Hi Phil, I have (found) two of the tiny screw-in probe tips, NOS, that I can part with. How about a (free) NOS witch hat (015-0135-00) for your P6201 or do you have one? When I purchased components

I asked the gentleman in question to plug in the 2465B, 2465, and the second 2445 to take a picture and see if there were a visible screen. He said no. I again wrote back to say it would take 5

As I recall, there was a variation of the 7D20 that was called the 7D20T, that fit in its own chassis, and was used in conjunction with computers to gather data. A picture is shown on page 338 of the

At least one, ideally two. NL->UK shipping is fine, I can't see that being too expensive! How much are you asking for the probe tips? I've found a few ebay listings in the US but either the price or

This 466 worked great for years, then suddenly I smelled something burning, and the fan stopped. All low voltages good on interface board, *except* for +15VDC. Reads about 4VDC, (and about 4 ohms to

Have you used the P6158 probes with this scope, and if you have, what are the drawbacks of the P6158 compared to the P6249? Thanks, - Frank

Troubleshooting an issue with my 466, where both traces would get blurry (unfocus) intermittently. The problem appeared to be mechanical in nature, as it responded to taps on the case. Opened it up