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Hi all, After my TDS8000 eBay bargain turned out to be a nicely working unit, I’m now looking for the expensive part, a Tektronix 80E04 sampling head. I know those modules are for sale on sites

I have used lead free solder with success on the ceramic strips. The solder used was Kester 24-7068-1402 Sn96.5 Ag3.0 Cu0.5. My current understanding is the issue is not the lead it is the LACK of

If we're talking about the same thing, it's an overlay of multiple waveforms.? What it shows is how long the transition takes and how uncertain it is (in time), and where the stable part of the

Hi, I am playing around with the DSA 602A and I am rather confused by histograms. I could create them, but I cannot imagine a way to make them useful (the manual does not say what they are

Apologies if this has been answered but I couldn't find in a search: I'm about to restore my first piece of Tek kit. understand the potential issue with the silver deposit ceramic strips and have

For the archives: the transistors finally arrived, and replacing Q1769 fixed the 7904 autofocus issue, allowing me to complete all the steps in the Z-axis service procedure. Ironically, the readout

I tried it with a 7704A that was pretty filthy, after reading the article here on scope washing and noticing the photo on the last page is of a 7K scope being washed at the Factory Service

Hello all, Many thanks for the tips Was not so, bad nor encrusted, just a soft brush and gently blowing, then isopropyl alcohol. About ESD the scope was grounded, damp and rainy weather. The

Forgot to mention - in real anti-static work environments it's common to have grounding leads or other conductors to keep any air or vacuum nozzles from charging. You can do that too easily enough, if

Check the dust with your fingers before going through a lot of effort. On most old gear I've seen, there is a "loose" dust coating that wipes or blows off easily, but underneath there's a gritty hard

Hi, I recently picked up the hobby of ( trying to ) repairing old test equipment and got a TDS540. I have been trying to get it to boot up but it is stuck with a flashrom checksum error. It seems

Hi folks, I wonder if this solution would work with the "Tektronix TDS500/600/700 NVRAM floppy backup and restore tool" posted here

I ordered several 2N2219A this morning. Mouser says that I ordered them before, but I can't find them.

Be careful with compressed air. In another device, I broke several thin wires from transformers.

Hello all, Have a 7904A, low SN, 1982, stored for decades. Usual cleaning of switches, contrlols, the CRT, bright and in focus. But all surfaces, PCB, PS, HV, CRT are coated with

The bigger deal is the doubled current draw. I reckon it -highly- unlikely that a 300mA draw might kill a secondary but I'd be checking things to be sure. Bill @ PEARL, Inc.

Bill, Anita said someone had put in a power resistor to compensate for the reduction of the number 12V heaters. Voltage checks are/have will/been done to confirm the correct heater voltage across the

I'm away from home on a laptop and couldn't look at the schematic first (I have a cherry 575 BTW) but even so there must be some brainiac kludge to circumvent the problem, it's simply not that

Bill, The heaters of the (8) 12AU6s are in series to the 100V supply. A 6V type will not work in this case. Mark

A 6AU6 is identical to a 12AU6 so why not sub in the 6 volt version and drop 6v across a zener or a resistor. It being a constant current load, either will work.