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HP8756A possible CRT subs? 4
I fired up this 8756A I've had for many years and never used because it didn't seem to work. The CRT is very dim and with poor focus. I tried to tweak it up a bit by guessing at various pots in the display module, with little improvement. I think the CRT is at its EOL. I can't find any (free) service manuals or info to work on it or even ID the CRT, and I don't think it's worth buying any since I'm very near to getting rid of it anyway, unless I see some potential goodness. Does anyone happen to know if the CRT is the same as in the 8566's IF/display unit (85665 I think)? I have some of these so it might be any easy swap if so, then I could see if it can be fixed. The faces appear to be the same size, and both are electrostatic deflection with drawn graticules, and similar application, so it would make sense to use the same CRT. I know that the over the years the 8566 displays had two different possible CRTs (and support HV circuitry) used - I'm hoping for either one to be a possible sub. Ed
Started by ed breya @ · Most recent @
Clorox Wipes & Magic Erasers 12
It¡¯s amazing what great job just some Clorox Wipes & Magic Erasers will do on a marketplace find!!! ¡­now on to the hard part¡­ figuring why the needles are pegging right!!! ???
Started by @ICY.dev @ · Most recent @
HP-8903A Audio analyzer - Un-stable output below 0.5865V (3-relay OSC Board)
Hello All, Need help on HP-8903A, it took more than 2 years fighting, 1.it came with an ERR=18 after checked, -15V rail had bad regulator A11U2 and shorted filter cap C02, an easy fix. 2 after few days playing, system suddenly did not respond to keyboard. found A8 CPU board , the most CPU pins were black and rusted, easily crashed when touch, by soldering IC directly to another CPU socket with fly wires. then seat back to original socket, it run perfectly again. 3. another few days running testing with GPIB program, thank you very much for great work from Mr. Pete Millett. Software did control the measurement and actions, however the voltage reading something wrong, (not taking notes clearly for this issue) through the block diagram, the RMS voltage measurement related with A4 board, follow troubleshooting sheet A4 1-3, confirmed no DC checked on A4TP1, A4U5 was suspicious. Replaced with a new LM301AH, it run good again. 4.few days later, the THD reading getting high just after power On, after 20mins warm up, the THD reading back to normal. after long chasing/measurement on board, and took one lead out to measure film caps. finally found out C45 3uf/100V reading is good, but leaking. New film cap was replaced, it read quick again. Rainy day always after sunny days.. 5.One more issue recognized, when OSC. output lower then 0.5865V, the voltage reading and THD was not stable, up/down slowly. it took long time verify this issue, Since not every time encountered, but says > 70% happened. I can't locate the issue either from Osc. board A6 nor Atten. Board A5, Until I got second unit in very reasonable low price, luckily, A6 Atten. board was confirmed defective board, after several swapping tests. 6. issue is my A6 board is "3 relay" version, can't find matched schematics/troubleshooting yet. the A6 board marked "08903-60105 / A-2242-10", Would someone could instruct where to have it. A6 board from second unit is "2 relay" version matched the service manual. almost last mile to go, any hints would be super appreciated! Chen-shen
Started by 2016kat211@... @
1 mw - 0dbm lab calibration 123
Hi all Regarding 1 mw lab calibration I am looking for comparisons between the old and trusted HP 432A the replacement N 432A and the Tegam 1830A and I was wondering if anyone hear Can give any feedback on the Tegam 1830A compared to the new N 432A Also is there a report comparing the 3 meters Regards Paul
Started by Paul Bicknell @ · Most recent @
(OT?...) Sticky labels for aluminum and other typical materials panels 29
Hi all, I've had limited success (hand) writing, and sometimes printing, labels to stick on DIY project boxes for miscellaneous labeling needs. There was some chatter here on materials and printing means and solutions, but I'm really only looking for some recommendations for DIY projects. What types of sticky labels are better for these specific applications? What stays put and doesn't peel off the minute finger pressure gets lifted, or there's some variation in temperature and/or humidity? Or just the passage of... minutes. I've this far used "office supplies" types, but they'd always peel off in short order, and there must be affordable, easily accessible other options I'm not aware of. Apologies if this is far off topic - hopefully others will find it useful for their own needs. Thank you, Radu.
Started by Radu Bogdan Dicher @ · Most recent @
8753 and related instrument docs available. 2
In going through my bookshelf recently I discovered several HP8753 A/B & C manuals as well as 8702 and even what appears to be R&D documentation created during the transition to color probably for the C. These include a variety of things including some schematics. If anyone wants these enough to pay for shipping from Colorado, US, I'd be willing to send them. Otherwise they will be scrapped. One way or another I expect them to be gone by June 2025. 8 May 2025 Glenn n6gn
Started by Glenn n6gn @ · Most recent @
(OT) Affordable PCB fabrication (-> tariffs/US...)
Hi all, This may of particular interest to US members, but I am wondering how others are handling the effect of tariffs (in particular with China) on your PCB fabrication needs. Though I should say, recommendations on reliable, good fabricators is likely information that everyone could use. I have two raiser cards I designed (for Fluke instrumentation/calibrating equipment), and maybe I should just wait for all this to blow over (assuming it settles somewhere different than where we are), but I'd rather plan for tough times. I used to use JLCPCB, but with the additional costs triggered by the tariffs, I may be looking at about two or three times the cost (rather closer to the latter than the former), and that just makes is unfeasible to offer this product. At what hobbyists are willing to pay for something like this (which, myself being one, I fully understand), I'd be losing money on each one I'd make. Are there some good options others have figured out where tariffs are not quite so onerous? I looked, for instance, at a place in India, which looks decent enough and not crazy expensive - though distinctly more expensive than JLCPCB - but they don't seem to have some of the capabilities I want, such as beveled card edge and so on. Their features seem to be about half as many as a place like JLCPCB offers. There are some places in the US - and OSH Park need not apply, as these are large and really need volume discounts - but they seem to be very low tech in terms of getting online quotes (=0 capabilities for such at what likely is the most affordable ones) and so it's very hard and time intensive to investigate. But if any of you knows a good, affordable and reliable place, I'd love to hear about it. From what I gather, at this point, offshoring this kind of thing is by far the most affordable and ultimately lucrative option. particularly at hobbyist level. With some places that can price me upon uploading my gerbers, I'm a bit antsy about giving them away. I heard stories where once uploaded, you essentially are giving away your IP and the design may pop up in mass production somewhere. Thank you, Radu.
Started by Radu Bogdan Dicher @
(OT) What kind of paint is used for these profi products 9
Group, I was always interested in what kind or type of paint the professional products are using - no chipping, slick, solid and just great. Very long lasting! What is the type of this paint, how is it transferred to the metal housing (is it spray or dipping or plain brush?) Any insight will be more than welcome! :) As an example, this is what I'm talking about (please disregard the Narda part numbers):
Started by LeonP @ · Most recent @
HP 8566B repair 5
Hello everyone. Suddenly my spectrum analyzer (HP 8566B) has the following problems: the low band signal is about 40 dB lower than it should be. The high band has stopped working: the various bands no longer appear on the screen, but a single band similar to the low band and the signal is completely absent! I strongly suspect that the YTX oscillator is dead or almost dead! Does anyone have any ideas about this? Thanks. Images: HP8566B and output at first LO connector. IMG_20250504_121626.jpg (89.93 kB, 1000x750 - viewed 13 times.) IMG_20250504_121605.jpg (122 kB, 1000x750 - viewed 16 times.)
Started by gsl@... @ · Most recent @
E4407B schematics 5
Dear Group, I have been trying to get the schematics of an Agilent (HP) E4407B ESA-E spectrum analyser. I am replacing the notorious frequency divider. I would really appreciate if any member of the group could tell me where the schematics can be found. Thanks for your help, Drod ?David Rodriguez Martin Cambridge, UK
Started by David Rodriguez Martin @ · Most recent @
FS: 85719A Noise Figure Measurements Personality CARD for HP8590E series
Offered for sale: A new, unused HP 85719A Noise Figure Personality Card, still enclosed and sealed in its original wrapped binder containing the associated documentation. Interested parties are invited to submit their offers via private message (PM). Compatibility note: Requires Option 119 in the 8590E series Spectrum Analyzer for operation. A 28V noise source, such as the HP 346A/B/C series, is also required for proper operation. Furthermore, the use of a Low Noise Amplifier (LNA such as the HP 87405A) preceding the Spectrum Analyzer is highly recommended to optimize performance. Shipping will be facilitated exclusively through reputable international courier services such as DHL, FedEx, or UPS, originating from France. Alternatively, buyers may arrange for their own designated carrier to collect the item directly from the seller's residence. Sincerely,
Started by F1EKU @
HP 8594E option question 5
On the back I have a sticker that says,¡±OPT R53¡± any idea what that means? Options I see under List of Options on the 8594E 004 010 041 101 130 Thanks, Andrew
Started by KB2LMN @ · Most recent @
HP 8510C with 8340A? 8
Hello Folks, sorry to annoy you with a problem - in an act of stupidity, I bought like half of a 8510C VNA. In particular, I got the display and the test set, which means I miss the compute unit and the waveform generator. A friend of mine would now have a 2602 serial number of the 8340A unit which he would want to offload onto me for a nice price. For me, the key question is whether this - it is quite an old version of the generator - will be compatible with the 8510C? I looked around the internet a bit, and so far did not find any binding answer... Tam -- With best regards Tam HANNA Enjoy electronics? Join 21k4 other followers by visiting the Crazy Electronics Lab at https://www.instagram.com/tam.hanna/
Started by Tam Hanna @ · Most recent @
Converting VNA HP8510C to 8530A for Antenna Measurements 25
Dear Colleagues, Does anyone of you own an 85101C display unit with option 011 and would be able to download the contents of the PAL security key 08530-80004 (option for the 8530A microwave receiver). I have an 85101C display unit that I would like to use for antenna measurements, I have the operating system on a LIF floppy disk ready to reload, unfortunately my 85101C unit does not have option 011 (dual identity 8510C/8530A). I would be extremely grateful, I think that the contents of the PAL would be also valuable for other microwave hobbyists. Best regards, Wojciech
Started by wojciechoo@... @ · Most recent @
Keysight R8486D/Q8486D microwave transition power sensor question 4
This rf power sensor has a waveguide to TEM transition which then drives the more or less standard diode detector/chopper mechanism (I assume, never seen one). Does anybody know if there is a filter between the 50MHz ref connector and the transition? Keysight manual says nothing besides not being repairable. Another question is calibration. It needs a 30dB atten so the sensor cals at -30dBm, how does the display know about that?
Started by Edward Prest @ · Most recent @
Basic 4.0 Series 200_300 Manuals 2
Available and PM directly for details. Thanks,
Started by alan victor @ · Most recent @
54720 Storing Cal Data
Hi All, Is there a way to save/store the cal data on a diskette, before replacing the backup battery? Thank you! Best, Francesco K5URG
Started by Francesco Ledda @
Service notes HP5343A, Count about 350MHz wrong 7
Can anybody point me in the direction where to find these service notes. 5342A-41B and 5343A-19A 5343A-7 and 5343A-8 Merry Christmas to all from OZ3BB
Started by OZ3BB @ · Most recent @
HP 3580a Option E02 7
Anyone know what Option E02 would be on an HP 3580A???? SgLabs_m_HP Agilent 3580A_3.jpg -dc
Started by @ICY.dev @ · Most recent @
HP 11683A Range Calibrator - Anyone ever swapped resistors for a repair? 5
Hey All, I dropped my 11683A Range Calibrator on the bench to test some 435A meters, and I've discovered that it is out of specification. Here is what I measured on the device: The lower level resistances are good, and my overall reference voltage is close to 15.8V (and can be adjusted to the 145mV as the manual specifies for the 1mW range). However, as you can see it fails the greater 1mW ranges, which I think indicates that there is a problem in the upper resistor array and this, again as far as I can tell, makes the voltage measurement stuff a bit dodgy. Does anyone have any recommendations on replacement resistors? The manual says a 0.1% with TC=0 +/- 10, the OEM was Micro-Ohm Corp of CA. Thanks, TonyG
Started by Tony Goodhew @ · Most recent @
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