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Good progress. 485 uses B sweep generator for 5/2/1ns settings even in A sweep setting. Since you are seeing functional 5/2/1ns in B sweep it is a problem of scope not selecting B sweep in 5/2/1ns

I was actually thinking of leaving it alone, if not for the reflection issues, at least from a historical perspective. I’d like to find good GR874 to BNC connectors, preferably in Europe

For everyone who was interested in these crystals I LOST YOUR INFO. I need your mailing address so I can send these out to you. The price will be $10 per crystal. If you want an extra one, and I have

Ahhh, that should be 170 - 180 ps, of course. Raymond

Just FYI: You don't *need* high-voltage to drive a tunnel diode (TD) of course. It's Tek's TD pulser that is dimensioned to be fed from a relatively high voltage. In it, relatively large resistors

I have a 6 foot P6011 1X probe I do not need. It works fine and it is in good mechanical and cosmetic condition. For more info on this probe see https://w140.com/tekwiki/wiki/P6011 It has a ground

Thanks for that further explanation, Albert. The 240mA max is written on the front plate, with the 120V max. Raymond

Experience will teach you that 120V into 50 Ohm is unlikely, if even only for the reason I mentioned earlier (> 140W output) and that use as a high-amplitude generator is possible with lesser loads,

In this case, the loaded output is not (50/650)*120 V. The fast rise holds for the edge from negative to GND where the output tubes are cut-off. Only then the output impedance is 600R. The amplitude

The PG506 some times will not have enough drive current to trip the tunnel diode in the pulser, It can be hit and miss especially with the ageing of the pulser diodes I have not had any issues with

Hi Martin, DON'T TRY THIS WITH YOUR SC502: When I was 12 or 13 I got my first Volt Ohm Meter (VOM). I used it to measure every battery and my skin resistance and anything that I could find. Eventually

You do need very good BNC (cables, connectors, constant contact surfaces) to get even close to that. Even good quality BNC tends to be visibly inferior above 500 - 800 MHz. I'd rather leave GR874 on

Thank you for the explanation.

To be honest, I haven’t had a look at the manual yet. It just seemed odd to me, while reading the page, that only 12V would be called “High Amplitude” while the front panel states 120V, which is

I reckon Subminature B is not less than 2/3 the size of SMA (given the same impedance)... so not much larger, as referenced to a BNC to SMA adaptor. In other words... they are about the same size...

Nothing odd about that. It's (max) 12V into 50 Ohm, (max) 120V unloaded. Many generators have an output impedance of 50 Ohm. Output voltage halves when loaded by 50 Ohm, compared to open-ended. Faster

There is not a lot of drive behind the signal. It is generated by 4 tubes in parallel so impedance mismatches will do very strange things. Properly terminated it will put out 100 volt + square Waves

Look at the manual, page 1-4. It lists both > 12v and > 120v depending on the termination (this does seem odd to me). DaveD

wrote: Here's what I did with the fan in my 485: /g/TekScopes/message/119458. Getting it out is a bit of a PITA, though.

Hi All, One of my three 519's does indeed have gold coated 125ohm GR connectors - the step gen, ext trig, and signal input. This scope came from the LANL Black Hole and has SN1054. Having taken a