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That shouldn't be hard to do. :) I have an older model and, for some reason, the gears have held up well in it. Those do appear to be nice replacements. Good job. Thanks, Barry - N4BUQ

Wow, those are beautiful. Nice work. I may have to find a broke 8640 now.

Dear friends, Not surprisingly, I discovered that my 1983 model 8640B signal generator bought on eBay suffered from the infamous problem of cracked combination/spur gears. It was not too bad and I

Thanks a million! Yes, I found the smoke let'r outer! It wont happen again. TNX es 73 -- Paul K. WA0BAG

Hi Michael, thanks for your update. I have got a 54542A which is widely identical to the 54542c and I had similar problems in 2013. In my case the problem was induced by an unstable -12V supply. Look

I bought a 8662A with missing left DCU cover. This is the cover over the sweep card not the GPIB/CPU/RAM/ROM. Anyone have one to spare? Eric Haskell

Hello again, Here's an update on the HP 54542C. First, I want to recap, this rig seems to be working, all functions as far as I can tell. The noise, which is superimposed on the trace is random but

I have a 54501A digitizing scope---not working---I will sell for parts or repair. Nice looking physically, powers up, screen ok but several error messages and not working due to errors. I can furnish

Precisely - I would look for a base-collector short in Q4. That would lower the current limiting resistance to about 560 ohms and increase the current through CR7 by a factor of about 40. Dale H.

Classic thinking Dale !.....zeners usually have a resistor in series to determine the current.....it must have taken excess current to smoke.........that generally can't come though the resistor (they

Dick I'll take the display, email sent Chuck -- See Early TV at: www.myvintagetv.com

Greetings, Circa 1 year ago I replaced the monochrome display on my 8753A VNA for a spiffy Simmconn Labs LCD. The monochrome display was in excellent shape, I was just tired of green on green. It

Looks like a 7V zener.? You can probably substitute a 6.8 or 7.5V unit, maybe 250 mW.? If you want to get close to 7V you can measure a few to see if you can find one close enough.? Not a critical

Later production calls for an HP 1902-0190 7.5 volt +/- 5% Zener for CR7. You will very likely smoke the replacement unless you first determine and repair the cause of the diode failure. Dale H. Cook,

I am trying to find a suitable substitute, or the specifications for the CR7, in an HP721A power supply. The HP part number is G-29A-3 I haven't found information on the web. Thanks a million for help

If you suspect power line ripple, you can set up a signal where you see some noise and then switch triggering to "line". If the noise is mostly stable, it is power line noise (probably 120Hz versus

Hello Harvey, Though my own 54522C is actually stuck out of work by some failure to initialize properly (described in previous posts), I have a wide experience using these scopes. Once, I got "jitter"

[hp_agilent_equipment] <hp_agilent_equipment@...> wrote: Cheers Dave, I will owe you a beer - a virtual one. That said, if you are ever in the UK, I'll buy you one! It's quite a few years

drkirkby@... [hp_agilent_equipment] wrote: I'll do this for you this afternoon. -Dave -- Dave McGuire, AK4HZ New Kensington, PA

Can anyone send me a picture of an 8510C, preferably with a floppy disk half-inserted into the instrument. I only need a photo of that bit - not the complete setup. I would add, I want to use this for