I've done that ... once. I had a main board for a Radio Shack Model III computer with ONE shorted 0.1uf bypass cap out of about 50 or so. 5V at 10 amps cleared it in less than a second. Vince.

Ok, the problem has been solved! As Siggi said, "this makes no sense". He was right, it made no sense. On the inverting input of U870A is the 4.99V reference. It measured 5.14V and the non-inverting i

Ok, here's where I'm at. ALL of the electrolytics, except the two big ones in the back, have been replaced. I tested them and they were all good with very low ESR so I'll toss them in a box for now. Q

Double checked, followed the foil, Channel 2 is definitely on pin 1. I got the power supply board out right now so it's definitely going to see some new caps. I'll also take a real close look at Q870

I had actually done that last nite, but didn't have the parts layout handy to see which probe was on which pin (I had them on the diodes>. Here they are with voltage measurements: http://www.hamradio.

Both the voltmeter and the 2430A. There's not much garbage on it but I did hang another cap on it and it made no difference. Here is a shot of both sides of R873 on the 2430A. At power off, both trace

Ok, Q879 collector is solid. When things go sour, it stays. The base voltage is moving, as is the emitter. So it's being told to compensate for the change. However, under normal conditions, the collec

F269 is soldered but I was able to clip onto L256. A minor amount of ripple that only changed by a few millivolts when I added a 2200uf cap across it. No change when I switch below 200ns. The 5V jumpi

Yep, I have a 2430A and a couple of 11402s. I used the 2430A. I checked the + and -5 and the + and -15 volt rails. Sure enough, the +5 volt rail drops exactly 1 volt while it's happening. I'm thinking

Acquisition stopped, doesn't happen. I can go all the way to 2ns/div. Normal trigger but trigger set to +or- 90v (not triggering), it happens. Single, doesn't happen, can go all the way to 2ns/div, ca

Repet on, Repet off, no difference. Vince.

Szabolcs, from here (TekScopes) posted a method of accessing the internal battery of the Dallas NVRAM modules using a heat gun and a scraper. The difference in these modules was that there were two ba

I picked up a 2440 on ebay that had the dead nvram battery problem. Got that fixed up with an external battery. Ran thru the self cal and ext cal and all seems fine, except when the sweep rate is turn

I have a DM501 and two DM502A. I had two DM501 but after getting my first 502A, I got another one soon after. The 501 uses an unobtainium IC, I used to have two 501s, that IC went in one of them. With

On the 502A you can select a range or select autorange. Vince - K8ZW.

I'm in a number of ebay FB groups and needless to say Managed Payments, aka Ayden, is a recurring topic. The thing is, the only concerns or complaints anyone has is before they switch - nobody likes c

When I get converted I plan on opening a checking account specifically for that. Ebay said there's no opt-out after you're in. BS, I can close that account! Vince - K8ZW.

Actually they're running behind. As they notify sellers, the seller will have 30 days (as I recall, might be longer) to get qualified for it. They said there's a good chance they won't have everyone m

These mask guys have been doing this on other groups. Dennis is 100% correct in his new policy. They ask some question, usually a how-to, and get approved. Then after they're approved here it comes. I

Just be careful of the upper pins on the JAMA extenders. Some have the a number of the A and B tied together. I didn't notice it and toasted a plugin. Vince.