AMP and others also made many BLUE ones (dark blue) for mil/aero use with high temp insulation (diayll pthallate?). Very common in collins and other avionics gear. we always referred to this line as I

We don't offer the re-bake process on U800's any longer at Sphere (because Toru in Japan does not do it any longer). The actual root cause of the primary problem with U800 is as follows: The modified

the album is here: https://groups.io/g/TekScopes/album?id=93348 currently the first album in our photo section, so it should have been easy to find... -walter

I just added some initial photos showing the before and after of the MR501 converted to a curve tracer. works very well, now I just have to re-do the faceplate. The album is called: MR501/SC501 conver

Well, 5 resistors and a rotary switch did the trick, I now have a variable range "huntron tracker" up and running in that modded MR501. it is currently in "ugly" prototype stage, literally held togeth

I have a heavily modded MR501 with almost all the controls removed. it's the same one shown on W140.com as being part of a receiver system. looking at the MR501 manual, it struck me that it does not u

For anybody interested in making this DP501 divide by sixteen prescaler work, here's my best fix: The best match is to a DC509/510 or DC5009/5010 counter which has a single rear pin designated as PreS

I have one of these (and in mint condition, probably because nobody ever used it), and have not been able to find a manual anywhere, so it's hard to answer this burning question: Why on EARTH does it

I had to fix three FG501A's this week, and a few interesting general points really became clear. These have a lot of the open back pushbutton switches (schadow style), and ALL were intermittent in EVE

ancel, I tried the variable cap de-oxit plan, works slightly better, but not a solid fix. I will have to try and get down to the rotary switch contacts. all the best, walter

I have been fixing TM500 stuff for the last week, and slowly accumulating a pile of bad plug ins that I don't want to fix. all look good cosmetically, complete with covers, but are triplicates or requ

I have a very nice late style SG503 that has strange operating behavior. rotting the band switch to various frequencies, it typically shows 000, and adjusting the frequency control does not fix this.

It turns out we actually HAVE 3 *NEW* 311-1404 concentric pot/switch assembles at Sphere, I'm just behind in posting the many Tek parts we bought from service centers. please email me off list (walter

I think printed knobs can be very successful in one area, the "push-on knobs" used throughout the 22xx and 24xx series. these are ALL plastic, and not too complex. there are two basic types, plain, an

Many thanks to everybody that helped out at our last stuff day event here at Sphere, and especially to my cohort Glenn, who helped break down and move a HUGE number of boxes to clear out that storage

I found five new boxed tubes in perfect condition during the after-stuff-day clean up effort. I believe this is used in the hp 410A probe, if you need some. Also found a box of old (but new in the box

1038-N10 Switches The switches on the N10 are a huge problem because the footprint and shaft do not match anything else. I was able to buy one box of replacement switches from Gigatronics (they inheri

Just a reminder, stuff day is this weekend (saturday) here at Sphere Research corp. Hope to see you there, we have a lot of Tek goodies (modules, spares and boards) we are giving away to anybody that

Does anybody have any kind of manual for this tiny little portable? I got one, but alas no docs of any kind. I am unclear on the Tekwiki data which seems to say the two channels are isolated from each

In our quest to make a lot more space, we are blowing out our Tek and HP CRTs at stuff day. Any tube, just $10 each. In just ONE room, I found all of these types, and there are two more large areas to