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I can speak of this from the 7904 perspective, since I have two that work, and some backup parts sources, I had 7904's available, and no 7904As. the 7A19 are the "appropriate" plugin for a 500 mhz

As a precaution, some switching supplies don't work well with a voltage below the operating voltage. For a linear supply, as the voltage to the supply rises, the regulator generally (if it has a

I stand corrected. Sometimes you can teach an old dog new tricks! ;) Thanks, Raymond! Jim

Issues and features that I recall: 7904 has lots of tantalum caps, and a couple are bound to blow. They are easy to find and fix. 7904 has a weak power supply that can't handle many of the

?Hi folks, Here's my proposed parts order on Digi-Key, except that I haven't decided between the first or second set of tantalums. The caps below those are to replace the large C1412, 14, 42, 52,

My email should have read “no well-known problems”. I had both a 7904 and a 7904A; I gave the 7904 away to a good home when I moved across the country, reducing my collection to five 7xxx

Hi Reginald, Advantages of the 7904A over the 7904: - Newer, so possibly less failure-prone - Easier to service because of split construction - Front panel layout very much like the 7104 (or is that

We can get the 4041 service manual scanned from the vintagetek.org microfiche library of all Tektronix documentation - after COVID-19 is over. Right now Oregon is still in lockdown. They only charge

Reg, As you may know from our prior conversations, I have both a 7104 and a 7904A. The 7904A is definitely my workhorse because, as you mention, I want to preserve and protect the mcp tube in the

The 7904A is easier to wotk pne because it has the “kickstand” feature where one can split the display section up off of the lower section to make repairs. I’ve never compared the specs of a

I have a 485 and a 7104. The fragile CRT of the latter discourages regular use unless needed. Reed refurbished my 485 and obviously it's a really fine instrument. I'm mulling over getting a 7904 for

IIRC, only the 432, 434, and 485 had switchers. The 485 was much like a 7K with the Tek-made controller chip. The 43X's were discrete. -ls-

Hey guys! Look at me with my newly acquired acronyms! ;-)

Still great advice for later when I'm working on a DUT with a SMPS. :-)

Hi Eric, Must they be removed from the circuit to get decent readings? If so, I'll do it. This thing seems to have been designed to make it easy to remove them once the large caps are

Excellent advice, Eric! Now I'm glad I just put that incandescent bulb in series when I turned it on the first time. Not that I have a variac (yet). Bruce

Hi all, I recently acquired a rather nice shape 184 for the princely sum of $70. After some good burn in and exercising the controls following by a few adjustments, it ticks along perfectly except

One of the things being added to my workshop is a vacuum system that would be suitable to pump down a CRT, but I wouldn't entrust myself to a CRT as rare as the one in the 576 as a test candidate! I

From what I've read...Tek took a systems approach with this series of 2400 scopes... so it's fair to consider a 2465B scope plus the Tek recommended P6137 as what Tek intended... when interpreting the

Raymond, Thanks for verifying. I thought that I knew these scopes pretty well. But I have been wrong before and it would not have been the first time that I stuck my foot in my mouth. I have a