开云体育

This is interesting! I have a 3L5 with serial number J22. Would that also be a prototype? Bob Krassa AC?JL

Thanks for the documents. It indeed seems a good subject for tinkering and having fun building samplers. wrote:

Want to buy 495P v9.7 EPROMs which are installed on the A54 memory board. P/Ns 160-8316-00 and 160-8315-00. Or, complete working A54 board with these EPROMs installed. RIck K8EZB

When you want to align and solder a new SOC IC, I apply a little solder to one corner pin, then position the new IC on the pads. Then I heat the pin over the pad with the solder. If it looks good, IO

Pretty clear you're not helpless! For what it's worth, I find pulling a SOIC is simple with basic tools, I use solder wick along all the pins first then 'ping' each pin in turn by using a scalpel

The SO style makes it both easier and more complicated. I use a metcal iron with a very specific desoldering tip for SO width packages. If you're not familiar with metcal, it's a very nice temperature

Sergey, Thanks for your input on the Norway extenders. This is exactly the reason I am looking for someone who has been there and done that to repair my A54 memory board. Inside knowledge/experience

The "B04" tag indicates it was a B-phase prototype build - fairly close to what went into production. These were used for final environmental, EMC, and other testing, and as demos for pre-introduction

Quick note about those extenders from Norway Labs -- they are OK and work for repairs (I refurbish 492BP/494AP instruments on a regular basis and use those) but one should be very careful when putting

Keep in mind that the upper section has current limiting so it should be able to run, at least for several seconds, with a dead short across the 43VDC secton. I had a 2213A at one time that was a real

John, Thanks for your reply. I'll check the DIP switches again. Thanks for the tips on removing these switches - will be helpful if I do the repairs myself. Norway Labs (http://www.norwaylabs.com/ )

Hey all, Does anyone know of a paint which is a close match to the knob color on 500 series scopes? Vallejo Air "Dark Sea Grey," "Dark Grey Blue," or "Black Grey RLM66" seem like they might be close.

Do you have a private email address, rather than do all this on public forum? Cheers Craig

Bruce Serial number indicates it was Pilot build/ engineering unit there was a thread about these serial numbers but it was years ago. One of the Tek veterans can probably provide a little? more

Cool. Got a postal address/PO box I can send them to? I can probably scrounge up a few HV diodes too, as they suck for the intended use but would be fine to replace annoying vacuum rectifiers made of

http://www.its.caltech.edu/~hajimiri/pdf/non-linear.transmission.pdf 1N4007's have been used in high voltage discrete NLTLs. Anritsu use NLTLs in theire VNA samplers:

Hi all, Quick check of the FET's learned this: the recommended IRF730 has a input capacity of 620pF The ordered replacement IPA60R280E6 has a typical input capacity of 950pF. Time will tell if the

Hi Bert & Vincent, I'll check capacity specs on the FET's as well -although already ordered :-) - but the good news in relation to the secondary power supply: The scope has been running fine for

(Facedesk!) Right, I forgot. OK -- I've posted the two photos in question to the 'kc7gr' album in the group's photo storage area. Thanks, Dave.

Okay - I'll take a look again at that. Perhaps it isn't as much trouble as I was thinking it was. Thanks, Barry - N4BUQ