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I recall the behavior's independent of rep rate (at least between 1 kHz or so and 1 MHz). I initially saw it with my homebrew avalanchers, but it also was apparent with 067-0681-01 (driven at whatever

r. Unfortunately Q203 is one of the more tedious-to-replace transistors in the HP130C, so at present it's put-off-today-what-you-can-do-later :), with the added excuse: experimentally lets see how

Hi Mike, Strange things in the dot pattern happen indeed in Random mode, but I don't remember a case of time-reversal. I think much depends on the repetition rate of your signal generator. I think the

Q203 may have developed more leakage over the years and will eventually have to be replaced. I'd look for a replacment just to be ready for when it does. Arden

Hi David, It's not an elongated dot. It's simply a small segment of the sine waveform. If you scroll through the scan positions, you will see that "dot" follows the shape of the sine wave. Therefore

I have seen them used though where profile was not a consideration. Tektronix of course early on had their own version with those low profile Teflon(?) insulated collets before they switched to

Hi Allow me to offer a different opinion on this isolation matter. I worked on a 7D13 with an isolated(floating) section this weeikend. I used my isolation gear so that I could tie my scope

Hi! Thanks much for the information! It's in the archive now, so the next to search on this will find it. Would you care to share the distributor you used, and I'm almost afraid to ask, the price?

At least check the incircuit power supply electrolytic capacitors for ESR. If you don't have an ESR tester, buy one or build one. There is lots of ESR information on the web and also in the archives

Hello Magnus. I do have a piece of equipment like that , this is what it looks like http://www.tiptemp.com/products/1359/variac Can you please explain some more. How can I find out if it is isolating,

Don Lewis wrote Fri, 20 Jan 2012 04:36:14 -0800 : " My old HP-130C scope has two 7586 Nuvistors in it, btw. " A really fine rig. I read somewhere the HP-130C is regarded by some as the last good

Hi Albert, Pointing me to triggering was an excellent judgement call. I fiddled a bit with the bias controls on the various TDs and managed to get a stable display at some trigger levels, but it was

David, Albert- I have vaguely similar issues with both my 7T11 and 7T11A in random mode. I see large gaps in the horizontal dot density, and even misplaced (time-reversed!!) dots. For example by

Good Day David, to amend: You may also want to get yourself an isolation transformer or an *isolation* VARIAC in order to have the device under test floating. This is a safety feature, so invest a

Has anyone seen this behaviour repairing Tek2000 series scope power supply? Behaviour 1. When power on from cold, it will fire up properly and stay on for a few minutes 2. Once it warms up, the power

Hi David, The RHS is also far from good. At those 20 MHz you should see no quality difference between sequential and random. I can more or less simulate your random waveform by playing with the

My old HP-130C scope?has two 7586 Nuvistors in it, btw. ? ? ? ? To: TekScopes@... Sent: Friday, January 20, 2012 12:30 AM Subject: [TekScopes] Re: Nuvistors. ? Yes, it may be a 13

kd8dey, That's the 4 pin transistor. Mouser had a listing for Albert's number, but in surface mount only. Digikey's search database must be down this morning. Thanks anyway! Mark

Hi folks, Please could you take a look at the pictures in here: <http://groups.yahoo.com/group/TekScopes/photos/album/248312034/pic/list> All working fine in sequential mode, but in random mode only

Fat fingers abound! ;-) Mark