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Hi Sean, With instruments of uncertain provenance, it's hard to say what a previous owner might have been thinking (or failing to think), so anything's possible. It's hard for me to understand why

Tom, I wonder if that's where this one came from, the one with the bodged leads. Since I'm guessing in the pulse generator application, it's not driving a crt? Sean

If you can find a junker PG502, that's another potential source of that vertical amplifier. --Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA

First off, I don't do videos. Sorry. I believe the real issue is that the centering is way the heck off, possibly due to bad (or damaged) ICs on both vertical amplifiers I have. The gain problem is

Yeah, it will need a full cal regardless...I changed out the CRT from the 7903 parts unit I have. I do have good quality non-inductive resistors on hand. Since I have two identical vertical

Thanks for the information Miguel, but I bought a TM503 with a TR503 and a DC503A plug-in from Germany. It hasn't arrived yet, when I get it I change the crystal and retune the cavity

Siggi, indeed this unit has OPT 6,9, CTT, WR and GPIB so both CTT/WR board and GPIB are installed. As I received the score with PSU dead and removed with all cables loose, I used the Option service

Hey Jon, I don't suppose the scope had any options installed that have been removed? After I repaired my 2467 I had a persistent TEST 05 failure. In my case this was because the options board was out

Hi Joel, Indeed, there are lots of things you can do when you are spooling thread, twine, or string. First, the thread has a twist to it, which makes it naturally want to lay with the help of the

Thanks, I'll take a look. Harvey

Hi, thanks for the warm welcome! I really admire the 500 series scopes as I think folks have taken pride in every step of designing and manufacturing those instruments, and that's more than

No, right now I not interested in anything that even could make me leave my bunker. I'm in my mid 80s so I probably would not survive a Covid hit. I am fortunate to be financially stable so it's

Years ago when my father was the plant engineer for the local Tultex cotton mill, I would go there with him and assist. Thinking back I remember on the giant Shlafhorst (sp) open end spinning frames

Hello Chuck: I traced line trigger signal, fine on the main board power connector, and it DOES line trigger! As the same fault Test 05 fail 42 appears on all the A5 control boards I have checked,

Hi Snap, I don't know that it is a gloat thing. I have somewhere around a hundred of my transformers in the hands of members of this group. I have wound a whole lot more when you consider all of

Hi Jose, I just checked in mine: When turning the grid bias, the voltage at C1660 goes from +/- 80 to +/-120 VDC positive. It was set for 105V in mine. Btw, the layout of my board is different

Sine wave, polyphase motor systems are inherently damped because of the sine arithmetic. The problem with sine wave systems is it is hard to have them locked into known ratios with other sine wave

Hi Bert, I did my first automation project using stepper motors in 1984. This isn't my first rodeo, as they say.. The arduino MEGA 256 is running software called GBRL MEGA 5x, which is a 6 axis

Drift of these low-value resistors (R657, R659, R662, R663, R672) in the vertical amplifier destroys impedance matching and so completely destroys frequency behavior. By "drifted over 5 Ohms", do you

Leo, Good for you. I was not looking forward to taking mine out of the case to confirm that voltage. It will be interesting to learn what that voltage should look like. -- Michael