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Take a look at https://w140.com/tekwiki/wiki/File:7s12-s6-s52-7613.jpg: Connect the S-6 to the pulser. Set time/Div to 50ps, distance to zero, vertical to 100 mV, Scan to REP, locate off (button in),

"IDENRIFY" is a typical symptom of a mis-alignment in the readout system. I don't remember off the top of my head which of the trimpots you need to tweak, but the procedure is described in the manual.

Thank you Dave. Hopefully he’ll see the post… I’m about 12h away from the guy showing up with the scope.

The 7S12 with S-6 adn S-52, if working, are about worth that, so in my book, yes, seems a good deal. Others might feel differently. Richard Steedman is in your time zone, and got me started with the

Not that I need another scope, but I am offered what I believe to be a good deal, and an opportunity to buy this 7704A that comes with a 7A26, 7B70, and a 7S12 (S-6 & S-52). I’ve never ever used a

Searching on "paraphase amplifier" turns up lots of hits for me, including a dictionary definition (that sounds surprisingly technical), a definition on element14, a definition at Newark.com which

Seems to be a Tektronix term. Looking up the term "paraphase amplifier" doesn't yield much. I did find a wiki article that used the term "paraphrase". Maybe a typo? In any case, commonly used in 465,

Paraphase, eh?? That's a new one on me.? Thanks for the new word.? ? ? ? Jim Ford?Sent from my Verizon, Samsung Galaxy smartphone

Found it: https://www.youtube.com/watch?v=gpicqfd3hbA And it's a push-pull amplifier, not paraphase. Paraphase is single ended to differential. I knew that. Duh.

Very interesting Albert, I’ll check the voltages on the tube. Thank you.

Well, thus the mystery. How does an amp fail in this way? I'm at a loss. Along the same lines of thinking: if I'm seeing the roll off at the interface pins 7A/7B then it must be something between the

Dave, So, I'll ask again, what kind of failure in Q821/Q931 (or around them) would result in lower bandwidth observed at their bases? Pardon my ignorant floundering, but it seems like the obvious

Cleaned the Delay Time switch, not fun. Used paper and MG Alcohol. See what Strange behavior I’m getting now, still can’t move pointer to left with position control. https://youtu.be/rqCcwnlji3E

Dave, Now that I'm thinking about it, is it even sensible for me to ask if the rolloff happens on only one of the two differential signals to the amplifier? Is there an easy way to measure just half

Dave, I agree that the problem is likely to be in the horizontal amplifier, but, as I said, given that you are seeing the rolloff at the connector pins, it can't be after Q821/Q931. The only

Do you have a copy of the correct service manual? A&B Sweep Generators are suspect. Horizontal amp appears out of balance, since the spot will only move slightly left of center and off the screen in

I tend to ramble, so I might have been too brief in an effort to be concise. I have the 5111A in question and a 5110 (5103/D10), so 6 slots. I have one 5A18N that I feel pretty good about - I've run

Stefano, There is vertical deflection from the calibration signal, it's just that in the early part of the video the vertical scale is set too high to see the deflection. Later in the video, when he

Here is a list I made for someone that wanted to get his going with new parts: The parts I selected are the best in quality I could find. I want parts to be in a piece for a long time without

That is strange, you get a vertical movement with your finger, but nothing with the calibrator that a working instrument confirms there is a signal. The horizontal contro looks like isn't properly