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I am pretty sure I have an A5 board with the 4 proms. If you don't get a source today, I can pull mine and read them tonight. Tom

Oh good grief. No good deed goes unpunished. I was going to backup the firmware on the A5 board, but apparently it's a bad thing to use the "identify chip" function of my PROM burner, as it seems to

The 465 and 475 were the workhorse 'scopes for many years. Highly reliable (once it is working) and pretty rugged.I used 475s and my "personal" 485 (means I kept it locked in my lab with the probes

It just occurred to me that adding a couple of diodes or a low voltage zener in series with the source of the top JFET would also assure cutoff. I will test using a 2N7000 as well since I keep those

Hi Dave - check your email. I sent you the 520B with schematics Jay [snip]

David, I bought a new ceramic hybrid U610 from Qservice in Greece. I found the very small (but massive impact for debugging) mention of dynamic calibration today in the 2430 service manual The

Matt: Take the covers off and then decide. You'll probably then choose the 454. I've got both, and prefer the 454 (build quality, fine trace etc). They are very relaible. You can source the nuvistors,

I need to go back on the group website and find Jerry's post and pictures. I have a 465 and 475 with original carts in the lab, and over the past several years the 475 has gotten erratic on the

Thanks Dave. I am in orthopaedic shoes, I stand corrected. I am a Tek/HP fan and since I have both in my shack in abundance I do often mix then up. Honestly, though, I am a bit amused by the rapidity

"Hill billy" I think you mean HP 8116A ( not Tektronix 8116A) :-) Dave ArtekManuals.com

What you could probably use is a Tektronix 8116A. It produces sine, square and triangular signals at any frequency from milli-hertz to 50 + MHz, over 20 v p/p with freely adjustable bias and duty

Dave Where did you see the manual for the 520B? We have the manuals for the TDS520 contact me off list for details Typically there will be enough similarities that between two models like this that

Jerry, Great job. Thanks for the sharing. Let's make good tektronix scopes immortal. Cslim

Yes, I'm well aware that amplifier noise needs to be measured with the input terminated. Doesn't do much if anything to the 7A26. I'm not talking about severe noise--just the difference between a

How many flavors are there of the TDS520 scope? I see the component-level service manual is available for the '520B. Is this also good for the straight '520 (no suffix) model? Thanks, Dave

Though this was a question, but it is not. Basically the 465B is an improved 465. It has the same basic layout and circuit, but with some little modifications to keep it going all the way through the

What's wrong with calling it a critical frequency? The article says it's the frequency of maximum dielectric loss, which is kind of the opposite of resonance. Anyway, how does it help you? If you want

Steve, I am SO glad you have acquired a Tek scope! I have a rather 'large' collection of different scopes. While I LOVE my 2465A and others, the new digital (color) models makes it real obvious how

Thanks Alex, I've done similar in the past. In my case, I made a small plastic box up with a mic connector one end to take the probe and a pair of banana plugs on the other to fit into the meter. I