No precursor, I'm just stunned by the winning bid of over $500. Nenad F.

I'd appreciate the enlightenment why somebody dished out >$500 for a PG506: https://www.ebay.co.uk/itm/Tektronix-PG-506-Calibration-Generator-/224356816953 A few months ago I was the second highest bi

Hi Atilio, Not on my unit, at least one zero should be lit. Without signal, the number of (zero) digits lit and decimal point position depends on the averaging setting (AVGS). Changing AVGS also affec

Hi Bob, You did not mention using any termination in your setup. Your HP 8657B performance is specified only if terminated with 50Ohm. Even if you did use an external 50Ohm terminator with your Tek 24

Hi Jeff, 5103N appears to be only the module mainframe, separate from the CRT unit. However I found the CRT circuit to be similar (if not identical) among the 5000 series models, so no problem there.

Hi Dennis, I believe it's not worth the effort, I'd personally build a new one using instructions from Sam's Laser FAQ: https://www.repairfaq.org/sam/laserhps.htm#hpstoc You'll find wealth of informat

Hi Chuck, Yes, I agree we derailed the subject by going deep into the cathode issues, but I still instinctively believe that double peaking explanation may be within grasp (without major research). Un

Perhaps my statement wasn't precise enough, I meant to say "if the interface layer was behind the double peaking phenomenon...", not question the interface layer existence per se. Oxide cathode is so

If the "interface layer" theory was true then the same negative resistance phenomenon would also be observable in conventional tubes. Personally I've never seen one behave like that, although I curve

The eBay ad is a mess but the device is decent, well worth it but won't do wonders for $20. It's a white noise source, just a plain Zener diode hooked to a wideband amplifier. Reference (average) leve

I've got one very much like this: https://www.ebay.com/itm/0-2-2000M-Noise-Signal-Generator-Simple-Spectrum-Tracking-Source-High-Flatness/174453557146 It's reasonably flat and worth the price. You mig

Using 7L* SAs in 7854 is a song. It's not just the digital storage, it's the averaging that can significantly help smooth the measurement and increase your SNR. I do it all the time with my 7L5 and al

Hi Everybody, Inspired by recent talk of the admirable 500 series, I'd like to share my story and some questions that keep bugging me. I'm in Eastern Europe. A month ago a local trader in scavenged EE

I kind of confirmed my initial belief, Tektronix document 062-0852-01 (Cathode Ray Tubes by Chuck DeVere) clearly states on page 9 that CRT cathode is indirectly heated oxide based type. However, a Te

Hi Everybody, I still believe that we're missing the proper explanation. A credible theory must precisely describe the mechanism behind the negative resistance which obviously occurs here. Negative re

Hi Walter, Jeffrey's comment is spot on, we need to know more about the type/application of the transformer(s) you intend to measure (line level, inter-stage, output...?) I suppose that'd also answer

Today I attempted disassembly of my Resolution/Freq. Span knob and got halfway there, photos (album name "7L5 Knob Repair Attempt"): https://groups.io/g/TekScopes/album?id=256833&p=Name,,,20,1,0,0 The

intermittently fault to 100k, 200k and 500k respectively. I have a 7L5 with a similar problem and it's driving me nuts. Restoration of front panel PCB sockets made no difference, so it all points to t

blueyonder.co.uk@groups.io> wrote: research chemist living in Britain, I have no idea of what this is and others may not also. It _could_ be "petroleum ether", which I am familiar with, but that comes

pushbutton switches (the square small ones). Is there a recommended cleaning procedure? I was going to do the standard use of Caig's DeOxit in a sparing manner, but perhaps there is a better way. > In