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Please call me Tom! :) --Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA 94305-4070 http://www-smirc.stanford.edu

As I said to Prof. Lee, D'oh! Now,I know better, at least, I think I do. Thanks Mike, klc

D'oh! Yes. The probe has the little pin sticking on the connector. Ya need the correct probe ! Thank you, klc

Stefano, Another way you can replace the low voltage electrolytic is to use #10 screws, star washers and nuts to secure them where the screw mounts are. The leads of the capacitor can be bent around

Hello Mark, thank you for the advise for the 741 on the horizontal amplifier, I'll check that one too. Actually I still have to do a few hours burn in test (hoping nothing will burn!) of the 7104, so

Yes, mains voltage primary types are widely available. But if anyone knows where to look for a lower voltage ratio, e.g. 3:1, 2:1, 1:1, with filament voltage secondary and very high isolation voltages

Hi Torch , I think I have found a solution -- an Ebay seller had a Stancor transformer 6.3v @ 1.2A rated for 5kV at a reasonable price , so I am now just waiting for the post . Brian (UK)

Hammond Manufacturing still makes some "classic" filament transformers and I think a few are hipot tested to 4kv. EG: 185E12. Primary 115/230. Secondary 6.3vac, 4A (in parallel -- 12.6vac 2A center

Interleaved responses. OK, then we have the right supply voltage. A lower voltage relay would, of course, draw more power. Since it's the coil doing all the heating, I'd do the following, a lot "just

Hi Tom, I disagree. There are those here to learn, those here to expound, those here for clarification, Those here... So long as any debate is civil, I for one am all for a clear hearing. larry

Harvey, et al, To directly answer Harvey's immediate questions: (1) Yes, +15 VDC. (2) Yes, per the manual. (3) How would one determine the current being drawn by the relay? I again refer you to the

You have a Guernsey (Channel Islands) produced 465. I would fix that DC Ripple first of all if I was working on it, but that is just how I roll.. You can also see if have a sawtooth waveform at

Rehorn's article gets around (I wouldn't really call it a 'paper')... it's okay... but, it's really directed towards engineers (not academia)... and engineers that did a sig&sys (versus

Hi Dave and Thanks for reply. Look here https://mobile.sites.google.com/site/linuxdigitallab/home/tektronix-4xx-power-supply In the square red box he shows the jumper I lifted. Found the

I'll ask the question I'm not sure has been answered. 1) is the relay driving voltage correct? 2) are those the right relays? (part #), voltage? 3) the nominal current for such a relay is between 15

Looking at the schematic the relays would all appear to be type #1 and would be activated continuously, controlled my manual switches directly or via some simple diode gating logic. It might be that

Hi Bill, If you have a 15V DC power supply, you might try removing one of those hot relays and powering it independently of the plugin to see whether it runs hot that way. It might be interesting to

Thanks!? Even better was the short bit on the "524AD Mystery Solved". -Dave

Hugo, Do you mean the "A7 Timing board" with the A/B sweep cam switch on it, or the "A8 Trigger Generator & Sweep Logic Board"? The A8 board has a 15uF, 20v electrolytic cap, C897 which could be a

The usual trick is to start unplugging board (PS wise) , measuring the errant supply each time.? Unless there's ECL logic on the scope (don't think so), the -8 volts likely feeds just analog