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What site are you and Roy referring to? Please include context (we aren't mind readers) so we don't have to guess. Dennis Tillman W7PF

Very late to the party (as usual...) I just had a thought I wanted to throw out there. My best understanding of the data sheet is that the 555 contact form is really just the 500 contacts with two

Apologies if this has come up before! I have a 576, and the plastic couplers for the Intensity and Focus knobs are, of course, broken. They look fairly hard to find, so I'm wondering what the best

It might also be of use to the small sub-group of radio amateurs that do TV. http://www.hamtv.com/ John

99.44 % sure the mark on a Ta cap is the positive terminal.? If it is in backwards it will say so loudly. Regards

I have an excellent 453 for sale. I don't know what it's worth, so I am entertaining offers. It's in Los Angeles. Let me know if any interest.

I have never seen any noticeable lingering effects from electronic cleaning solvents on the resistive elements. Most electronic cleaning agents evaporate and leave no residue. Even the solvents that

ironcoder@... wrote on 4/17/2019 1:26 PM: Hello-- Another pot-related problem arises in older equipment (e.g., antique radios) when a tin-plated outer steel shell sprouts tin whiskers:

Yes Gary, I ruined a pot years ago from carelessness. I am very very cautious now. You want to drill the outer cover but not let the drill enter into the pot itself at all.

The cleaner will evaporate.? Its job is complete, which is to remove the dirt or dissolve the oxides.? The residue remains to fester and cause problems again, but for the most part is well out of

This has been a very interesting thread on how to clean potentiometers, but there has been no mention of what happens after you get the cleaner/lubrication into the potentiometer. Do you leave the

Be careful where you drill that hole. It is easy to scratch and break the resistive element. It is best to find an old discardable identical potentiometer that you can open up to see where the

You're welcome. Glad to be of help. The probe is nice, good for full bandwidth on a 7A19 or 7A29. I prefer 7A29's because I think they're less prone to damage. The 7A24, which is good, has somewhat

To Jim & John: I just tried a 7B71/7B70 set in a 7904 (they were really meant for the 7704(A) but work fine in most any 7xxx mainframe). I've always found the trigger setting knob in these time bases

You can look at NTSC video (old analog video) with it. It is pretty much useless for anything else as it is a specialized instrument. It was the waveform monitor of choice back in the day when I was a

Ok, I can try that. I'll have to get another pulse generator than the calibrator to be steeper slope. Later today.

Thanks Harvey. I studied things a bit more and decided to give up. The FET probe is on Ebay as Parts/repair with missing probe socket. I tried to list it factually. I hate giving up but sometimes it

I've been following this thread with some interest because I have a 7B71 myself.? Planning to try it in 7904 when I get a chance.? With 7A26 and new-to-me 7A11's.? Maybe this weekend.? I will post

If you're doing anything with baseband video, such as CCTV cameras for surveillance systems, video tape recorders, etc., then you'll want this. It looks at very specific things on the video waveform

You seem to say that it too sometimes displays the same behaviour, which is only natural, as may be deduced from what I wrote earlier. You are looking at a very slow ramp/edge, triggering a time base