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There is this long string of 10M resistors that forms the focus string... They tend to be open. -Chuck Harris john@... wrote:

I have an opportunity to buy a 7934 mainframe. I would have preferred a 7904A but the 7934 has come up. I am not all that impressed with storage tube scopes but ignoring the storage function how do

Hey all. I'm new to the group and trying to restore 475 scope. when I got it, 2 of the voltages were way off. The +110 was about +19 and the +105/160 was coming in at +10.7. The other voltages

According to the recently scanned and released transformer list on VintageTek it's for the 408, 412, or 414 portable patient monitors. Mid to late 70's vintage. Richard

Hello guys I just bought a 7104 fully loaded with plugin for 30 bucks from this guy on offer up in California. But its partially working. I posted a video of what it does. I'm excited to get some

Hi, I have tried adjusting the rear focus control to get a good focus on the screen, but it just 'jumps about' I have tried the trimmer on the main PCB underside of the unit which allows me to adjust

Hi everyone, I bought some time ago (2017) a TEK 2465B that I didn't have too much time to play with (having 2 kids and a travelling job doesn't help!) I have been toying with it lately, and I've

Welcome, I have 1 7401 with this Plug ins: 7A18A , 7A29 , 7B53A , 7b15 I need help rebuilding it. It turns on, and If I give a little smack and play with the buttons, eventually I got a distored

Welcome, I'm not afraid, my name is Oscillator Sherman You have any vidoes or PIctures of the monster oscilloscope I just bought a 1ghz tektronix 7104 for 30 dollars Partially working. Here is my

Hello, I'm Armando I'm new here.. I just bought a 7401 for 30 bucks. , it turns on, and if I play with the buttons and give a little smack , I get a distorted, extra wide and chopped up trace.

Hello all I just got a 7104 for 30 dollars. With all 4 plugins. Including the 1ghz one. I need help fixing it. It powers on but the trace is wide and choppy . I created a video. Please see it and

That was my conclusion. But the UI is so bad that I thought there might be a variable delay line in there somewhere that would adjust channel skew. I've also discovered it is buggy as all hell. You

Reg, If you display the two channels simultaneously then they share the same time base speed and position. I don't see how you tried to align the rising edges. On my CSA's I do this: display both

Personally I'd replace C911: 22uF 15V tant bead on a 13V PSU rail, diagram 17 (not the PSU diagram!), and IIRC there are a couple of others on that rail, hidden on the other diagrams 7, 9, 11,

In switcher parlence, the "start up" capacitor is called the bootstrap capacitor because the supply picks itself up by its bootstraps. It is often charged by using a high wattage resistor connected

Switching supplies can be a problem when they fail. I recently had a Agilent VXI E4808A chassis that the main power supply failed, at least its 12 volts out did. That power supply is huge with a

SMD electrolytic capacitors are a tricky problem in several ways: First, they are easily damaged by the heat of the reflow oven, and solvents that may be used in cleaning flux,... though

Does anyone know how to remove the complete sampler block from the printed circuit board? I ask since I'd like to replace the channel select switches. The solder lips are hidden between sampler block

I have to agree with Chuck. Most test equipment with imbedded/integrated switchers are going to be very difficult to qualify parts if working. Their functionality can be extremely subtle. Blanket

Hmmm...? Did he die-bond, wire-bond, and package the FPGA or just solder it onto the board?? Not so impressive if it's the latter.? Still, the link to the website shows microwave devices being