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The readout board part # is 670-1900-XX. Looks like it was used in lots of scopes, not just those I listed. Thanks

By swapping in the above IC from another scope, I've determined that the custom IC on my 7844 has died. Would anyone happen to have one they would part with, or have an entire working readout board

BNC have poor performance above 1.8 to 2GHz so they may slow the risetime of the pulse. SMA is a much better choice, and this is what Tek used in the later versions of the HAPG. But at the time it was

Hi Albert..probably I put some meters of RG147 as fixed(solder) internal line in order to obtain a 100nS pulse width. What is the secret about this GR connectors ?, I have the temptation to replace by

I will be surprised if there is a manual since it does not even have a part number. Sometimes you have to settle for the next best thing. Dennis

Very useful info indeed..thanks a lot Dennis. I'm not feel "safe men" until obtain the right info about..I just like to have "all" the service manual of my gear. I was send a mail to Artekmanual , but

Dan; There's a bunch of material on this subject in the forum's archives. More was added, recently. Check it out. Bernd

I think you are being overly concerned about your purchase not working. These are rugged instruments and not likely to fail. The PV509 manual is close enough to tell you everything you will need to

Thanks for the info. I'm going to give it a shot this evening. Chris

Correction: in my early XF unit the charge line is soldered to the board. Probably a peltola jack has been removed there. In my later XH unit the board and the line have SMA connectors. Albert

Hi Gabriel, Your HAPG version is a rather early one. I have one with a sticker (not the original label) saying SN160. The boards are exactly the same version XF, with the same hand written signature

Thanks George, This morning I was thinking that I should add more comments to those pictures while it was all fresh in my mind, so I edited them to explain things a bit better. Turns out that the

Tom, Great photos and an excellent addition to the documentation of the 7K scope. Thanks! George

Try different sweep speeds to see what the envelope looks like, then try line triggering to see if it will lock to the envelope. If it does, then supply ripple or ground loops are the likely problem.

I was going to suggest checking both power supply outputs for ripple with the AC range of a multimeter or an oscilloscope set to AC coupling but I think you found the problem. That fuzzy output is

The list I have says that the 7844 and 7104 use the same readout board which is Tektronix part number 670-1900-XX so as far as I know, you can just swap the boards. There is a PDF called

I have a 7844 that works fine except for the complete lack of readout. In looking at voltages and signals around the U2126 timer chip, all is OK except for pins 7 and 10. I have a junker 7104 that

Does it clear up if you turn the shop lights off? From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Philip Sent: Wednesday, February 27, 2013 6:44 PM To:

Indeed! Very timely for me, I think. I just bought a used 7k rigid extender (http://www.ebay.com/itm/Tektronix-067-0589-00-Calibration-Fixture-Plug-In-E xtender-/170994285368?_trksid=p2047675.l2557