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Excellent advice, Eric! Now I'm glad I just put that incandescent bulb in series when I turned it on the first time. Not that I have a variac (yet). Bruce

Hi all, I recently acquired a rather nice shape 184 for the princely sum of $70. After some good burn in and exercising the controls following by a few adjustments, it ticks along perfectly except

One of the things being added to my workshop is a vacuum system that would be suitable to pump down a CRT, but I wouldn't entrust myself to a CRT as rare as the one in the 576 as a test candidate! I

From what I've read...Tek took a systems approach with this series of 2400 scopes... so it's fair to consider a 2465B scope plus the Tek recommended P6137 as what Tek intended... when interpreting the

Raymond, Thanks for verifying. I thought that I knew these scopes pretty well. But I have been wrong before and it would not have been the first time that I stuck my foot in my mouth. I have a

That is correct. Raymond

Eric, I am pretty certain that the 455/465/475 use a linear power supply. That is the purpose of the big heavy transformer in the back of the scope. If it was a SMPS then there would be no need for

Hi Jim, The artifacts that I was referring to don't show up on standard 'scope calibrators. Those only allow you to adjust "LF" behavior with a 1 kHz square wave (flat top). I meant fast-edge

I would test the rectifiers the silicon is usually pretty resilient and normally grossly fails "open or short". I have only run in to one transistor so far that has "kind of" failed that one took a

Bruce, Another critical peace of advice. Before you tare something down take a TON of picture from ALL angles. This will aid you in reassembly. A digital camera in the lab can save you hours in a

Martin, ??? Unfortunatly I can answer that. I have the tube in question it is weak. It is doing a double ramp but this one is slightly weak. I have a second tube as well that is VERY weak. I have

I agree. I recently grabbed a P6139A out of Raytheon Technologies (RTX, my day job) e-waste bin and found that it works well with my 400 MHz HP 54504A scope (also an RTX rescue). I was able to

James, Maybe my earlier response was a bit terse and therefore limited. The general answer to your question "Is this probe a good match for my scope?" should be "no". Chuck's answer and mine show you

If you're going to the trouble of ordering new ones and replacing, I believe it's also now understood to be good practice to de-rate tantalums by *at least* 2 x the operating voltage. (In these lists

Tektronix tweaked the probes meant for the 2465B to match the response of the inputs on the 2465B, so for specified performance, only a p6137 will do. But, likely you will never notice the

Hi Bruce, Okay - I was thinking the 475's caps were the same as the 465 but perhaps not. It's a custom board I designed and had manufactured. BTW, if you notice, the board shown has a trace that

Many enthusiastic youngsters had comparable experiences with instrument companies in the 1960s. General Electric and to a lesser degree RCA were also very kind to young hams and experimenters. I spent

Stephen, I think it would be pretty simple to put an Arduino board inside the 4041 case - connected to the internal keyboard header, plus my resistor mod so the Arduino could direct drive serial into

It would be insofar as bandwidth is concerned. The transient response however is not matched to the input characteristics of the 2465B. It'll work but signal fidelity will not be optimal, resulting in

Ryan, has that CRT been taken? If not, I would be interested, does the screen appear burned? My 576 works, but has a completely dead spot where the intensity was left too high with a static spot