Actually, most of those that know, know that isn't the case. Variacs won't help. They are frequently fatal when applied to switching power supplies, or scope supplies with time delay

Hi all, I believe most people know that if you power an old scope up that's been lying around for years doing nothing, then you can expect a *bang* and lots of smoke, usually from an electrolytic that

Does it do this on both channels? Is it only the volt/div readout which is affected? 20kHz is from the inverter. I do not think the connection between the readout divider and the multiplexor could

Tektronix made the Type 285 power supply for operating a single S-50 series head. The manual includes details and schematic: <http://w140.com/tekwiki/wiki/285>

The 5V filter is something like 11Kuf, and it dries out, letting the 5V logic signals dance wildly. This will affect most everything in the curve tracer. The 3uf 150V, C719, is parth of the -75V

There are two 2000uf caps in the rectifier circuit for the 50v supply, this is where I found a damaged diode from corrosion. They are in parallel and rated at 75v. I want to replace them with a single

Indeed - especially when one has the bad habit of reading threads from the latest post backwards....................! Now there is a sentence you could take several ways ;-) Craig #yiv7198230673

Found the problem. One end of the center conductor came loose from its connection on the little compensation board PCB. With careful soldering using a custom tip, I was able to reattach that very tiny

Now there is a sentence you could take several ways ;-) Craig

Probably with the switch half way out each pole of the switch is open circuit. Do you have any way of checking Q164 and Q174? You can do basic open circuit and short circuit checks with just a

There is a writeup on the washing process; look on the Vintage Tek web site, or on Stan Griffiths' site.Avoid spraying any cardboard, chassis-mounted electrolytic caps.Tek used to offer plastic

Thanks Chuck,I'll plan to change them immediately I don't suppose they could cause the step inop. Brent

Before you go too far, there are two capacitors that are always bad in the 576. The 5V filter cap, and a 3uf 150V wet tantalum cap. -Chuck Harris Brent Watson brentleew2003@... [TekScopes]

Also just found out trace appears if I leave invert switch halfway out but no functions work when the trace appears. Sent from my iPhone

I just checked the invert switch and when I pull it the trace flashes on the screen and then disappears instantly. Sent from my iPhone

After a day of cleaning and lubing switches and contacts on the 576, it's not as bad as I thought. I used a small artists' brush and lightly coated a few circuit board  traces with DeOxit. Using

Ok, will compare it to my 2465a shield for dimensions.

The implosion shield is just another loose plastic piece behind the blue or clear filter. It's part number and physical dimensions may vary a little bit depending on the serial number of your scope,

One more thing - the S-52 output may appear rather strange due to the pattern of its operation. It's not a simple on/off pulse. Only one edge is the fast one of proper level. It occurs about 85 nSec

Get the manuals for it and the 7S12 - it should be clear and quite simple to set it up for stand-alone running. When properly powered up, the S-52 free-runs and provides a pre-trigger output. Ed