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Jerry- Beautiful pictures, thanks! I've also repaired cold joints inside two attenuator modules in my 475A. I also used liquid flux and modest reflow heat. Also worth mentioning: the plug-in

If I were faced with the choice, and the choice was not immediately obvious, I would keep and use both until I knew which one I preferred for my particular application. Dave

That is very nice of you and good advice. I might add that even when the original idea pans out, discoveries made during the research process often lead to unanticipated new avenues to follow. Keep

On 01/04/2013 09:36 PM, larrys@... wrote: memory says that was the case > for both 453's and 454's. I think the A version of both were FET's. I have had a 453 with FETs since 75.

As a computer field service eng, I carried a 454 then switched to a 465B. The 454 actually had a higher bandwidth ( 150 Mhz) vs 100Mhz on the 465B . note that the 475 offers 200 mhz BW. Primarily the

Scott, Being very attentive to the issue of programmers damaging chips, can you tell me what EPROM you were trying to read and what your PROM burner is? Thanks. Joe

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