The ch 2 lever moves but stays in dc mode. There is no detent snap but some drag going through gnd position. Am I correct assuming this is a loose grub screw?

Hi fiftythreebuick, Your thread is quite informative about the 555, and the great satisfaction to own and use it.. My single-beam 547 has an adjustment for trace rotation. in the dual-beam tube,

I'm not in my workshop now. Tomorrow, I will check the suggested test points. I am going to buy the U500 from an American seller that I once bought a 2465B, which I ended up selling to buy this 2467B

It sounds like a 502, which was my first Tek and I still have it stored away. It is a double beam with one timebase common to both beams. It's a little bit smaller than a 545. The vertical amps are

Not really. U500 is a pretty high failure item. I suggested the measurements around CHN5B, and CHN5A pins because they are the way it is driven for automatic tests. The transistor that drives

Generally, I go right from the AUTO voltage measurement failure to cleaning U500, to replacing U500.... but then, I have spare scopes that I keep to verify failed hybrids.. If you want to be doubly

Chuck, I'll take this and ask one more question: In addition to the U500, any other suspicious ICs that you can buy to take advantage of the shipment from the USA to Brazil? Thanks

Chuck. I will order this IC on Ebay then. Before ordering the CI, would you like me to do some other measure in the scope? I have another scope (hitachi) that I can use for this. Thanks for your

My next step after cleaning U500 is to replace it with a known working U500 from one of my test scopes. They are a very common failure part. -Chuck Harris Leandro Lindemann via Groups.Io wrote:

Hello Chuck. I removed the IC U500. I cleaned with Deoxit D5 its terminals and its socket. Unfortunately it didn't. Problem persist. Then I removed the IC PAL, cleaned his contacts and the problem

Yes. Leandro Lindemann via Groups.Io wrote:

I have now ended the resuscitation from 40 years hibernation of my 547 scope. I could not be more pleased with it. It has now inside an added little centrifugal blower fan that cools the HV supply.

I understood your explanations Chuck. I will do this today, and I will return with the result. With much hope of being something simple, like bad contact. In this case, the hybrid is the U500,

I understood your explanations Chuck. I will do this today, and I will return with the result. With much hope of being something simple, like bad contact. In this case, the hybrid is the U500,

Walter, Please advise me of when the "stuff day" is to take place and when you post listings of what stuff is up for sale. I can't make the trip, but I will consider bidding online. Regards, Steve

It doesn't take much care to work with the "finned" hybrids. They each have 4, #4-40 nuts, with captive star lock washers, that hold them to the socket. Some of the hybrids use a hex standoff as one

The next stuff day event is tentatively set for saturday May 2nd. this time seems clear for most people, but let me know if there's a problem. This year we will also have "remote" stuff day, where

Thanks for the link.

Hello Chuck. First of all, thank you very much for helping me. Thank you also for informing that you were using the cursors in the wrong way. I learned that now. Regarding hybrid ICs, I never

You are looking at the military service manual... it is not the best manual to have. The US military standardized on the Fluke calibrators. You can calibrate your scope with the usual SG503/504,