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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

Raymond, I read what‘s written on the machine... >= 120V, <12ns into 50ohms. Forgive my lack of knowledge, or maybe my lack of understanding, but would 12V be considered “High Amplitude”?

As far as I know none of the 519s had gold on their front panel GR connectors. You can easily tell the difference between a 50 ohm and a 125 ohm impedance GR connector by looking at the inner

And it was installed to replace the fixed increment control, instead of the variable control, which explains why fixed increment is inoperative. Very interesting.

Aha! Mystery solved. Apparently whoever installed the mod didn't also install the new front panel label (or it fell off). I never occurred to me to try to pull on the knob; sure enough it pulls out!

David, Not in the UK or EU, so I cannot be much help with a panel. I did print a panel for my project . I used PETG and imported the STL File into CURA for slicing. My CURA slicer is set up to use

According to the specifications (Tek catalog 1970), 12V is the correct value. You have to realize that with a duty cycle around 50% (the 106 goes from less than 45% to more than 55%), average *output*

Hey TT, I'm excited to hear what you find. In particular, if you look at the LCS_CSEL1/0 lines, it should be possible to know whether the display is refreshed RGB or RGBW (for some permutation of

BTW, while researching this, I noticed a small error on the TekWiki page. It states the following: “ High Amplitude Output: 12 V into 50 Ω load, 12 ns rise time, 600 Ω output impedance, GR-874

I kept the gr connectors on the fast rise but good quality bnc is good to 4 Ghz so I changed the high output one for ease of hookup. Just needed a quick adaptor plate. Eric

Yesterday I picked up from eBay a Type 106 High Amplitude (120v into 50ohm), Fast Rise Square Wave Generator. I haven’t received it from Germany yet. I’m wondering whether I should keep the

Thanks Jeff, I haven’t ordered anything yet. I’m waiting for my list of needed stuff to get a bit bigger and order everything at the same time. I’ll keep that in mind though. Thank you.