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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

Here is what I found on digikey after some searching. 5600uf 50v Nichicons same class as yours. 330uf 160v Nichicon 1500uf 100v Nichicon 560uf 63v Nichicon A couple of them are different class but all

The panel is easy to get off it is held on just two flat head phillips screws and the fuse cover box it lifts off with the cord attached you just need to take off the wires the ground is bolted to the

Hmmm. I'm not sure if that would work with the existing panel and not sure how much effort it is to replace the entire back panel. Also, shipping would start to climb with the panel and we're

I actually have one that is at an angle but it is only a small plastic knob it that helps but all the rest are in the large rubber style boot. I can leave it in the panel if you like that way you

That would probably work but I'd have to cut off the boot and I kind of hate to do that as those are hard to find. Perhaps I'll find one of the "plain" style cords. Thanks, Barry - N4BUQ