Bonjur, mon signeur Pierre! Why don't you try to repair the power supplies? These seem simple enough for a try Greetings from Brazil Alexandre Souza, PU1BZZ ...
Bonjour Alexandre, & the Gang, I'm into this process but last time I've tried to repair such a shitty cheap switching power supply I discovered after changing...
AT the moment, they’re not too difficult to work on. The full service documentation is available including the CLIPs. It does help to have a 85629B for...
Does anyone have the discs that Agilent made to service the 70427A and the 70428A? Part numbers are 70427-90003 70428-90007, and 70428-90008 Thanks, Richard...
Hi Everyone, In the process of troubleshooting a noisy fan on my HP 54542A scope, I broke the power switch shaft. This is a push-on-push-off type that attaches...
Has anyone had any experience with the resolution bandwidth filter crystals in these old units aging at different enough rates that they no longer match at...
Steve, Doug's suggestion is a nice start. On my unit, I ended up testing every single cap (desoldering one end) for both capacitance and ESR. I needed a...
Nice Dave, Hadnt seen that page before. Its a nice and simple way to check for ESR. ... -- Bernardo Santos Regence Audio http://www.regenceaudio.com ...
Hi all, Does anyone know what's the replacement for the power switch light bulb for the HP 8903B? And, where to get it? The light bulb in my unit is burnt...
Hi Jeff, this is the first I hear about such drift in the filter crystals, I have designed several of such stages myself. IMHO the trimmer cap or the inductor...
Here : http://www.pa4tim.nl/?p=381 I have used that way too, This is a quick and usable way. It can be accurate too, but that depends in the components and...
That was my initial thoughts as well, that they would age about the same; although I've had old HF radios that one band would be spot one, while others would...
OK, I have decided to crack open the EMI filter. The power switch is a Schadow NE18, type T70 DPST push-on-push-off type. Available under "NE18" for a few...
... You can get some pretty decent 12V DC fans from computer shops. Look for the Noctua low-noise ones if you want to quiet down your 54542, but compare the...
Hi Phil, The Comair-Rotron fan in the 54542A is a MD12B2X, cast aluminum and ball bearings. Costs an arm and a leg. I cannot feel any loose in the fan shaft....
Bert, You might try removing the paper label that covers the bearings on the fan, and apply a drop of light oil. I find a tube of fishing reel oil at the...
Hello, I would like to have nice, good working RF Milliwatt meter (i.e. HP 435). There are so many nice ones, at great prices on ebay. But very, very few come...
... To the same place the rainguards go and midget people are buried...it must be a secret place, because the remaints are very expensive. I have a 435 and a...
... "... I would like to have nice, good working RF Milliwatt meter (i.e. HP 435). There are so many nice ones, at great prices on ebay. But very, very few...
Sometimes, even within a working lab, these things are hard to find. At one big company I worked at, you were doing good just to hold on to your oscilloscope...
Bob, You might consider the HP 432-series Power Meter. They are older units, but still are very good instruments. There is a complete setup including cable...
... They do have one decade less range, but as George says, they are good instruments, are fairly rugged, can be calibrated against DC, and in fact are...
Everyone thinks the heads get dumped. I don't agree. They get blown up or transferred to the new digital/dual channel meter that has been bought to replace the...
... Hello Dan & all by chance I have one 478A sensor in unopened factory package! I uploaded a picture in to the Photos area. See OH2NLT album. I am interested...
I have two meters, one cable and one thermistorhead. But it turned out it was "modified" so it did kinda work but a normal resistor instead of on of the...
... Good idea! Even if I could make then use in a smaller frequency range, say, below 500MHz it would be great! I'll try to put some work on this direction......
... Typically, when a company is going out of business, or closing a division, they take all the instruments, sans attachments, and put them on a rack. then...
... You won't like this answer, but I do believe that it's correct, and it's what I've heard. When a piece of equipment is "decommissioned", the people in...
