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

greetings to all, I have the schematic of the option 7 board for the DC508A, but I think it can also be adapted for the DC502, the problem is that I don't know what are the changes to be made to the D

John, I do have a manual that contains a schematic for the 6106 (most probably from tekwiki). I do see the two inductors, but they don't look like part of a T-coil in this case. They certainly do have

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

I have a interesting issue with a 577 D1 storage CRT where random portions of the trace will flash brightly at random times on the screen. I tried turning the brightness to minimum where the trace dis

Hi, I recently adquire this unit I had a diplexder and WG so to be able to increase the 21GHz frequency but this unit does not go over the 21GHz limit. It does not appear to have any options but it do

Hello all: My workhorse 7A26 needed rework, in 7804 mainframe. Cleaned the AC/DC/GR contacts on attn with the iso alcohol-paper strips, and exercised some scratchy controls. Poor fast transient respon

Hi all, I recently picked up a P6137 scope probe for a song and thought I'd try my luck. Predictably, the center conductor on the cable is open circuit..... Is there any way to repair or replace this

I need to make some space on my bench, and for measurements as high as this will go, I usually move to a spectrum analyzer anyway. 4 channels, 1 GHz, color display. GPIB and floppy work; I didn't test

Hello everybody, I have a Tektronix 7904. The device was probably left unused in the attic for a long time. After opening the device, I noticed that the board for the horizontal deflection was quite d

Hi Ozan, Yes, it's funny how once you notice something, you suddenly see it everywhere. In the case of the 741, that NPN-PNP mashup was done to work around the terrible performance of PNPs. By combini

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

Peter Keller asked me to pass this along to the group. I'm sure he was smiling the entire time he wrote it. Dennis Tillman W7pF I guess it is time for the real story of the Coketron to be exposed. The

https://sacramento.craigslist.org/zip/d/rio-linda-two-1950s-oscilloscopes-for/7261128129.html About 45 min from where I live, just north of Sacramento, California USA

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

No relation to seller https://sacramento.craigslist.org/ele/d/vacaville-tektronix-535a-oscilloscope/7262163827.html Not bad with scopemobile etc. About an hour east of San Francisco also 5113 https://

Hi Folks - I'm seeing an intermittent intensity modulation at line frequency on my 564, and have been unable to measure the source. I've tried both a 3B3 timebase, and a 3A72 in the horizontal slot wi

I mailed all of the international orders for Peter Keller's book today with the exception of the five going in one package to the United Kingdom via UPS. Those will be mailed as soon as I get the pape

Found this on Craigslist https://corvallis.craigslist.org/ele/d/corvallis-large-lot-of-tektronix-test/7261764719.html

Previously you might have noticed I have an issue with the 577 curve tracer where the IV curve has an offset problem, click the link below to see a picture that demonstrates the problem https://groups