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Hello KO4BB, Thanks for invitation. Upload done. Regards/Roumen LZ3RV

Jeanette, I had heard that as well. Do you remember what year the audio express article was published? George

There was such a modification in June and July issues of AudioXpress (which, I am going to guess, you don't have!). Uses a pair of 1N4742 12V 1W zeners to split the supply. There's an important

Upload it to KO4BB.com....

Hello all, Due to our "Files" area restriction ( it is full ) I can not upload what I promised few hours ago. Sorry ! In any case I will send to anyone who wish. Just ask. Regards. Roumen / LZ3RV

Hello all. First - please excuse my bad English. I am going to share my experience to restore defective HP8593A Power Supply (PS). Nothing useful found in the net...except: you can send PS for repair

Be carefull with what you spray in. Some of those things conduct very good, resulting in a potentiometer that is not reacting anymore. I have just repaired a transcreiver where the former owner had

I forgot to mention that it is important to glue the plastic tube to the nozzle otherwise the pressure will send the whole assembly including needle across the room. I used a plumbers PVC adhesive.

Hi Guerrino, Congratulations for your finding! I had a similar problem in my HP-8672A. I bought it as 'unworking' at eBay... and, yes, it didn't work ;-). It is a very complex unit and I was afraid of

Hi Jose, the issue is found, the problem came from the RF section , there is a signal named HPON , normally this signal is 5V and is coming from the 5.2V power supply RF section , the signal was

Sold. Thanks to all who inquired.

<willcoele@...> wrote: I have encountered this also.

I have three 204B oscillators I'm restoring. One had a problem where C2 (the 3 section, 1% capacitor) had a shorted section. I replaced the shorted section with single 1%, .3uF. Close enough for the

I've done the PIC version some years ago for an HP analog spectrum analyzer with X, Y and Pen Lift outputs. Worked reasonably well. The algorithm holds a do nothing loop waiting for the pen lift

It is still useful information! Thanks to all. I have a Velleman two channel digital scope that runs on the USB on a computer. It will do X-Y and I may try that for the units that have analog outputs.

Interesting and informational! Thanks, Greg

ferrymanr wrote: Me too! I recently "repaired" a Tek 7B53A and a Fluke 8600A with about $0.10 worth of contact cleaner generously applied to the switches. Both units were EBay "Parts - not working"

Hello, I have an HP3468A that appears to have a bad control ROM. The unit just cycles between power up (lights up all elements on the display and a brief display of: OV.LD C:3111 and repeat. The

I have a customised nozzle for my aerosol can of contact fluid. I still have the supplied 10cm length of tube but have fitted a hypodermic needle to the end. This allows me to get a little fluid into

Most units did not come with complete service manuals. They had to be purchased separately. I believe HP has made all their old manuals public domain. Actually I believe they have been requesting any