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I am trying to find out if there is an equivalent commercial PN to replace an 04194-81803. Thank you, Francesco Ledda

Meanwhile i found a bad (high resistance) hf transistor Q219, located in the amp. It is a MM4018, which is not available. Can I use a 2N5160? This is from the specs a similar type: PNP, 40V,hfe 10,

Thanks to all for the information on the HP-466A! Hope I can help others from my HP experience ('77-'2001).

I have, as listed in the 1994 Options List, an HP-478A-H63, which is spec'd to operate from 100 KHz to 1 GHz and it really does respond that low and lower. It belonged to HP Division 4 (does anyone

Hi David? Thank you found the information so made a new file HP 478A? and put the information in there Regards :Paul

Hey again, Here are the photos. The one with the big blob is the blown one. It does melt with the iron so it's indeed solder. Thanks for the info on possible replacements.

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