Hi everybody, I'm new here and hope not to make too much mistakes. I own a 7704A scope in need of serious attention. Two 7A26 and a 7B53AN. I also have a 7904 with 7A19 & 7B87. Nothing happens when pl

So I got this 7104 from Radu (for the low, low price of free!). Known issue is that the 5 Vertical Mode pushbutton switches directly below the screen don't pop out. Popping off the front panel reveale

Hello everybody, and...HEEELP! HEEEELP!!!!. It seems that I have erased the data inside the Dallas DS1486-120 Watchdog timer chip. I wanted to try my dexterity with the Dremel, and everything went wel

I thought I knew everything about the 2465Bs, but every once in a while I get surprised. I have a 2465B that powers up and passes all self-tests, but comes up in the diagnostic screen with the code <0

Yes, that's right, I am giving away my 7603! It works, but one plastic cover came off the middle slot connector, so the middle slot is not usable as it stands. And I had to replace the electrolytic ca

Given a single-beam, dual-trace scope such as a 7704A (and many others like it), if the scope's triggering is set to ALT (the large buttons above the amplifiers for a 7704A), and the two amplifiers ca

Is there anyone out there doing electrophysiology / EKG / EMG studies ? I am looking for some info on the Gould range of bio – amps and recorders. A web – trawl just comes up with the ‘scopes (or Glen

Looking for input on tube testers. If it helps for clarity's sake most of my gear is from the 500 series and its accompanying plugins. If a tube was used in that series (excluding CRTs) I have at leas

Hi guys, I am closing my little lab. All is for sale, pick-up only in Quebec, Canada, Montreal West Island area. Part of the list of items: -7854 (plus second one for parts) -7904A (plus 7904 for part

Dear all, I happened to destroy this knob while trying to fit it in. It broke in dozen of pieces so it is impossible for me even try to glue the pieces together to allow me to draw a sketch for 3D pri

I have been doing some distortion analysis in the lab and working on checking in my SG505’s and in this testing it seems my AA501 is performing out of spec and needs some repair. When testing my SG505

I apologize for the Off Topic post, but I don't know what to do to fix these ancient metal handles on an antique dresser. 2 of them broke, and I tried to epoxy them back together with JB Weld, even wi

Hello All, Could someone tell me the part number for the Tek TDS5054B 10.4 inch LCD display panel? Mine has developed a red line on the right side. It does not show on an external monitor. I have the

I just ordered a PG506 and a SG504 metal front plate from PCBway, several units I have are already metal. DP-100, 015-0408-00, 067-0916-00 and067-1039-00 are metal, I have no 5000 units to look at. --

Dear all, I am finishing the restoration/repair of one of those "beasts". With the help of you guys in several threads, I managed to get it working. Now there was the question of the knobs. While star

Dear Tek gurus, a friend of mine has recently opened up his TAS465 to fix the 'flaky push buttons on the front panel problem' and found that there was a large void inside the case on the RHS behind th

Hi, dear folks I had to admit, that I was very exciting playing with my old tektronix 475, before it suddenly fail, now no show more trace, nor beam finder. No HV, the TP1318 get 21.6V but no the wave

Hi, I encountered a strange issue with my tek 475 and I am kind of stuck at the moment. The vertical output drop 30% after the scope warm up about 5 to 10mins. The input is at 0.1V sensitivity (10x pr

Hi Gang…. I posted last week that I just acquired my first Oscilloscope last week after 56 years being licensed and working on literally tons of vacuum tube radios without one. The military AN/ USM-4

Hi all, I have a bunch of scopes I want to adjust/calibrate and I'm looking for something (DIY is fine) to use in place of the usual tunnel diode pulser used with the PG506 as called for in many scope