I had to make the same choice when I moved cross-country in 2017. I chose to keep the 7904A because it has the kickstand and the 7904 does not. Having worked on both, I decided that the kickstand

Title says it all. I have multiple (MULTIPLE!) Tek mainframes and I'm hoping to cull the herd this year. I want to keep one 500MHz scope and it's either the 7904 or 7904A. What are the advantages

You're welcome.  I don't know if you have the particular HV transformer, but as Chuck (next) says, you're definitely looking at a low high voltage, so the question, of course, is why.... For the

Because you don't get a lot of room to route the heavy traces needed in a power supply, with a two layer circuit board, designers very often used cheats, like using the fact that all of the negative

When the Anode voltage on the CRT is lower than it is supposed to be, the electrons in the beam travel proportionately slower than they should. Because they are slower, they spend a longer amount of

hello everyone after changing the electrolytic capacitors on my teak 475 I have a problem that turned on after a few minutes it turns off I checked that the transistor Q1446 2n2222 was defective due

Hello Harvey: Thank you for your hint on future diagnosis. I will start collecting more information on epoxy coated transformer first. 5D10 seemed to work fine except read out information had been

About the middle of the page: https://www.estatesales.net/CA/Rocklin/95677/2475516 No connection, but is in a neighboring town. That 7904A looks like it has 7S12 in it with modules Bob

Hi Leonard, I replied to you minutes after your first request, and the same after your second request. But your spam filter obviously doesn't like me. I suggest you check your spam folder. Here is

Hi Bruce- I use the 475  as my preferred scope...so If it is still available...I will take it. we should do this off list from here ....k6fsb dot 1 at the gmail place Renée

Fellow Tekkies, While hunting for a part this morning, I came across a Tektronix module which I think is the vertical driver board for a 460 or 470 series. The part number is 670-3023-02. I don't

Guys, I've once again restored a 547 almost at the edge of the dirt container, got it working (except then both time-bases A & B do not trigger but that's for later as I run an 1S2 right now which

Albert, Thank you for your comments. I check again the CRT circuit and fuse F1437 is ok, the capacitor C1437 is new (I have change it last week) and Q1430 is ok also. Nevertheless I believe something

Hmm...would like to know as well. I have a DC505a counter, but went with an HP5386A for bigger range afterward. Most of my older HF gear to 3Ghz is combined Tektronix & HP/Agilent. RiGOL for the newer

You definitely want to look into one of two things, either bad/reduced high voltage (symptoms would be magnified deflection because a slower electron stream is easier to deflect), and then the

Thank you.  That looks like a perfect solution.  I really like the idea of being able to change the battery. Is anybody selling these boards? Tom

Yes. https://www.eevblog.com/forum/repair/tds3014-adventures-(seeking-75-75mhz-oscillator)/msg2766224/#msg2766224

Hello Harvey: Since the intensity went down in recent event it never came back. What this 5116 did after turned on was nothing on the screen, even if the intensity control knob was turned fully

Chuck, I like your value system... it really does put things in perspective. 😝

Dear Tektronix Group - Any Member have Tektronix 2794 or Tektronix 2756P For Sale ? Regards Marc Christian