Or just click on reply to all and delete the groups address. Don Black.

I think the premise of this discussion was that it indicated a 7M11 delay line was good to 3 GHz. It probably is but the question is how good is it at passing very fast (sub nano second) pulses withou

Is all this discussion on drift a fault or just the requirement to allow a reasonable warm up time before making measurements (I guess that's what the discussion is all about). And hence the way the e

Yes Tom, pretty much brute force. You might be right about the rotational speed, hope someone else can shed some light. Is this a CRT as we understand it? Well it does use a beam of electrons hitting

Thanks for the link to the nice photos Tom, It would have been nice if there was a shot of the anode face to see the score marks from the beam. Are you sure it's rotated by a 60 Hz supply? I was under

The rotating part is the disc anode which is of course in the vacuum. It runs in a plain bearing that can operate in a vacuum (lead I think although there are probably other varieties). It is spun by

It's not a CRT but a rotating anode X-ray tube has a (very fast) rotating element with external connection that has to carry significant current. Don Black.

I think the HP recorder I'm thinking of just used a very high intensity tube to "burn" a trace directly onto a paper strip. I don't think it was particularly light sensitive paper but not sure about t

Those single axis tubes used in the Tektronix hard copiers sound like the equivalent to the HP one I mentioned. Also the B&K flying spot scanners that I should have thought of (I have one). Flying spo

In the fifties there was a Marconi TV station synch pulse generator that used diode pump dividers. A blocking oscillator provided pulses to a diode rectifier that charged the following blocking oscill

Hi, I've been having so much trouble with Yahoo and their NEO, not just on TCA but all groups that I belong to. And it's not just me, there are a torrent of complaints. Yahoo don't seem to want to kno

I think it still does. Don Black.

Yes indeed. Tell that to Yahoo. Don Black.

I hate it too! Don Black. PS If it's not broke, they still have to fix it - job justification. I still hate it.

What a pity I'm on the other side of the world. I think I even have an original type CRT (5CP1A?) of unknown condition to restore it back to original. Oh well. I hope someone gives it a good home, a r

There may be too much jitter in the mercury relay switching time but here's an idea for pre-triggering without a signal delay line. If the time base is triggered off the relay switching voltage it wil

Or perhaps Tektronix design was good enough that beating with the mains wasn't a problem. Maybe they just played Bingo and pulled out number 55 and thought "that'll do". Don Black.

Fair enough Michael but you asked if there was something else available that would find your glitch and I was just suggesting a later scope could do that. Your analysis of the problem is worth while a

I've just bought a cheap DSO to connect to my computer via USB and am still learning about it. I'll make the following comments and hope someone really familiar with DSOs will correct any wild flights

The S52 rise-time is 25 ps or less. Don Black.