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It's painful but you can rebuild the Siemens motors. You have to unwind them to get at the bearings which is a massive pain and when reassembling take great care of the fragile hall effect sensors.

Just bought the Kitsune-Denshi Battery Kit anyway. It's a good investment. I really like the portability of the Oscilloscope and it works well for that. Ross

You make mention that the Tek 222 Digital Oscilloscope is isolated. That is correct and the AC-to DC Adapter provides pretty good Isolation as well. I have used the 222 Oscilloscope many times in high

Finally got around to working on this some more after a very busy work week. Yes, the noise was there full time, you could kinda see it on the waveforms a little bit when not in x10 mode, was most

Sorry should have said UK. That's a good point! I still like the old phosphor scopes. I used a 465 for a long time and them moved to the more versatile 2465 after a try with HP scopes which I didn't

Where are you located as shipping a CRT is a major cost factor. Regards

A topic from long time ago; just thinking of some old puzzles. I have a 2465 (not A or B) which works except for a focus problem. Focus amp seems to work fine (voltages match my calculations / values

I’ve come quite a long way into repairing this early 547. All the TD’s are replaced and working properly, all the electrolytics have been replaced, a few out-of-spec resistors have been replaced

Roman, I was successful fixing leakage induced offsets in some DM50x modules by identifying input circuit board traces which were adjacent to power supply traces, cutting them at both ends, and

IIUC, the Bodnar pulser does not output a flat waveform – all design effort went into getting the fastest possible rise. 067-0521 and 106 put out a flat waveform. Dave Wise Sent: Thursday, April 28,

Greg, Tom, Ed Thanks for your inputs, guys. Tom, I tried your antenna thing but it made no visible difference, Ed, I worked on your idea of inter-switch leakage. You are right, there is a lot of +5V

In looking at the type 107 it looks like there is not much that will fail in it other than the normal power supply caps. The 106 has a lot more going on in it. If I can capture some waveforms from a

A cheap Dremel collet could probably be adapted for this - it looks quite doable https://www.amazon.com/dp/B094QV4HTQ

Zen, In that case, I might return to the 067-0521-00 to see what the waveform looks like after I blundered into adjusting the whole system with the Bodner. You make a very good point anent

PMF, Please disregard the second message as I missed the part about the 50 Ohm terminator. What I get for typing out emails and getting interrupted. I will base what I am about to say out of the 7K

PMF one other thing to note after looking up the 1a1 you will need a 50 Ohm terminator to get the rise time out of the Leo pulser. These can be had for $20.00 an example is here

PMF I have a bunch of calibration videos out on you tube about doing these adjustments. Not on a 547 but 465's and 485's I have also been told that 475's are on the way. The adjustment display is the

I bought one last week to play with. I also bought one of the eBay versions too. I want characterize the difference between my two R7103/7A29/7A29/7B10, 7854/7A19/7A19/7B87/7B80, 5104 Digital,

Thanks H?kan, that's quite enlightening. Even having read the warning in the manual, it's surprising how much the measured value changes at higher frequencies. -- Jeff Dutky

I started to use my recently received Leo Bodner Fast Rise Pulse Generator (BNC) on my Tek 547/1A1 before wondering if I should seek advice here. I will stipulate that I had looked through the archive