It depends what the cap is used for. Tantalum characteristics dear to designers: 1. Low ESR 2. Low leakage (electrical, not chemical!) 3. Stable capacitance You will not get (3) with an aluminum elect

I don't know about the 22xx series calibration procedures, but recently familiarized myself with the 465. There were several adjustments to the horizontal sweep that used/addressed the Time Delay Posi

I recently picked up a 5A21N scope plug-in as a parts unit from which to build Jared Cabot's updated TM500 mainframe tester. I noticed this type lacks the back-plate or lower guide-pins found in some

Ah yes, Wet Tantalum. Any of the Tantalum caps are replaceable with Electrolytic, right? Is the only reason they were used was the size (capacitance, space, money) technology at the time? Are their an

I found that the STEP OFFSET AMPL selector can be set between current or voltage, in voltage mode I probed right at the base of the test fixture and found a clean staircase pattern so I believe no con

After I wrote my missive about finding the break with a nanoVNA, I thought about the problem further. Last year, I started to explore why Tek Probes use t-coils - boy oh boy was that a fun project. An

That used to be a Sprague 109D, Wet Tantalum capacitor. I would replace with a 10uF to 15uF 100v to 150v aluminum electrolytic. Or, a 3.3uF polypropylene film type if it will fit. Dave

The manual has been updated and uploaded just now, it's version 1.4. Also, PCB's are ordered too, they will take a little while to be made as we optioned for the hard gold coating on the edge connecto

Hi, Since I’ve had this scope (2235), it’s one that I enjoy using because it’s fairly light in comparison to my other ones; the form factor is convenient. And it gets the job done for my needs. Howeve

Pleased to report a package of Peter Keller books arrived safe and sound in the UK end of last week. I was rather surprised how fine these are - nice hardbound volumes with nice design work - a pleasu

I hope that was/is depleted uranium! Just for the record, Corning sold the rights to the name Pyrex years ago. Last I was in Corning, it appeared they had shut down all operations there, with the exce

Dave, The 465 I worked on had that cap leaking and I replaced it with a 4uf/150 volt. Mouser #: 75TVA1402 Mfr. #: TVA1402 Desc.: Aluminum Electrolytic Capacitors Axial Leaded 150V 4.0 uF Price $2.71 e

What is the type of this capacitor, and what are its appropriate replacement types? Picture of C1534: https://groups.io/g/TekScopes/photo/258720/0?p=Created,,,20,2,0,0 Manual calls for: FXD,ELCTLT: 3U

I have recently acquired a well optioned 2465 DMS in good condition (except for some exterior damage and degradation that was easily repaired) but I am having trouble finding an operators manual that

Well I guess I won’t be receiving my book. That seems ridiculous that it’s not moving. There must be another issue. Maybe need to file a claim with USPS. Craig

Hi David, My 576 has a knob like yours but not exactly the same. The odd thing about the knobs on mine are they only have one flute. The 7000 series knob that Jon Paul used probably had two flutes (18

Link didn't come out right in previous post: Schematic (sheet 4) in https://w140.com/tekwiki/images/3/30/070-4206-00_2235_Service_Manual.pdf shows 50k-ohm for R5921 Page 182, location A-3 Ozan

Hi Steve, All of your contributions to TekScopes are, by definition, not off topic. If anything, I regret that you don't have the time to contribute more often. All that I know about observing the pri

I've found other typos in the Tek service manuals, especially in the parts lists. I have seen several examples of dropped or doubled letters in part numbers (I think it was in a 475 service manual whe

Schematic (sheet 4) in w140.com shows 50k-ohm for R9521 although part list shows as 50-ohm. From the schematic 50k looks right, 50-ohm change wouldn't make any noticeable change in timing (Thevenin eq