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Here are the 478A options listed in the 1994 options list, that is on the web somewhere. David

Re HP 478 A Thermistor mounts could someone –please direct me to a listing of the different options for example HP 478 A - H75 also interested in any one that uses the H75 option Regards Paul

Ok, tgat's good to know. DaveD KC0WJN [email protected]> wrote:

I have a scanned copy.? It's not great, and I don't remember where I got it, but I've attached it anyway... ~~ Mark

Isn’t one solution to side modes using multiple (fiber) loops of different lengths, such that fewer frequencies fit? (Borrowed thinking in terms of laser resonators and etalons where sometimes

The OSCON type capacitors aren’t available in higher voltage ratings. ________________________________ Sent: Tuesday, March 4, 2025 11:30:05 AM To: [email protected]

I'll add that since, in general, modern caps are smaller than vintage caps, make sure the the voltage rating of the new cap provides sufficient margin over the voltage rail. For instance, Tektronix

Arnaud, you can replace Ta caps with alternatives in most applications, so there's no need to spend too much for an original type. Usually ones that burn out are in supply bypassing spots, which are

Mike, No worries, everything I'm doing is at my own risk and expense. I welcome any ideas - Razvan, Jim thanks to you too! Radu [email protected]> wrote:

Radu, I am not sure what the chemical is that they are using. You need to find out what it is from someone who is familiar with chemicals such as a chemical engineer. I would guess that

Well I have run into the laminates also. But on a HP8640b it was the transformer and it finally let the smoke out. This happened some 20 years ago and on that generator I plumbed in a external linear

Years back I had a problem in my 8660 where I had 60 Hz sidebands on the CW output that exceeded spec.? After extended troubleshooting and consultations with the (at the time) Yahoo group it came out

Hey everyone, I'll check whether or not the blob will melt. Both capacitors have this blob, although it is more pronunced on the dead one. Considering that we can now see inside the capacitor I think

Thanks, Jim! We have gone through all the usual suspects when choosing the phase noise kit for this round. There was also NoiseXT (is it former Aeroflex?) Cross-correlation is a great advantage but

Thank you Jeremy, I might pick one up to play with. I have spoken to Jeremy Everard last year about shared low phase oscillators development and ended up sending him the actives I was using that

When the orange “tombstone” plastic encapsulated surface mount tantalum caps fail, they fail shorted. Last year, while powering up a 9000/715, I saw one actually flame because I had the good

Once calibration/correction constants have been computed externally on a computer, would it be possible to upload the computed correction constants to the 8510C so it can do calibrated measurements

My AC mains 60 Hz (however, good question!) Other than irritating (and not really all that bad, seeing as the cooling fan is about the same total dBa), it was more of a concern that it might be

Do you mean that the audible noise is there when operating on 400 Hz, or that it's there at 50 or 60 Hz now? You are right to suspect the core laminations buzzing. On transformers intentionally built

My HP 8660B (subject of the instability issue now resolved) includes option 003 which is compatibility with 48-440 Hz power sources. The HP 8660B has a linear power supply (ca. 1970s, predates