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In Reply to: RE: Why aren't you using your scope for problems like this? (nt) posted by Triode_Kingdom on October 21, 2016 at 09:27:44
I think you probably are TK. The one electronics course I took in college (I was a CE major so that is all that was required) never even had a lab, just basic equations and such. Since you have been working with them a long time you have come to think there's nothing to it, but that's not the case for someone who is just starting to learn how to use one. Lots of knobs and dials there Pardner!
Edits: 10/21/16 10/21/16Follow Ups:
there are many parts to it so look at each one and have fun learning! :)
It is really the pits to have crappy internet service. I started looking at the first video and at 10 minutes in it crashed. Rebooted it and it did the same thing again. I will try later today but I may have a problem watching these. I hope not because what I have seen so far looks good.
Just had a quick look and book marked 3 episodes. Looks like it has promise. Thanks!
TK gave you a hint how to use a scope. Simply touch the scope probe to the circuit and adjust the dials until you see a signal. Use a 100x probe when working with HV. You really cant screw up using this method.
Do you realize how many combinations there are doing that that will give you nothing? All it takes is one setting wrong. I have been going through the manuals for the scope and my signal generator and have gotten a trace of a sine wave that way, so that is progress. However, it seems to me that a slap happy run through the unit probing here and there is a waste of time. Surely someone has written trouble shooting procedures for tube amps that would use a logical sequence for determining what the problem is. THAT'S what I want to find.
you pretty much know the voltage your testing so that setting is easy.
The other setting you need to adjust is time (frequency)
Other than that, use internal trigger and center the beam. You really don't need to use any advance features for what your doing. Also, get yourself a large 8 ohm resistor for a load.
Once you get the settings in the right place you won't have to change them other than the voltage scale. Start by using you preamp output with a 1khz sine wave, once you get that dialed in, use the voltage setting from then on for other measurements. You cant blow up your scope by being on the wrong setting, it will just be out of range of the screen.
I've read my share of books which never helped me much. Keep building and troubleshooting as there's no better substitute for experience. If you have any experienced friends nearby, have them show you some of the tricks of the trade.
You can then start measuring output, clipping, etc...
Edits: 10/23/16
That's the kind of info I am looking for. Just to check though, I think (hope) you meant you can't blow up your scope instead of can. : )
Don't have anyone to show me this stuff which makes it a bit tougher too, but I got one through one of Cougar's tutorials a little while ago and I think they will help too. I will keep plugging away at it until I at least get the basics down. I know it can be a big help just from learning how to use it to trace a signal when trouble shooting. That was a real yahoo! moment for me. Thanks for the explanation!
I meant can't, not can. My eyes struggle with the IPad sometimes.
https://www.parts-express.com/8-ohm-100w-non-inductive-dummy-load-resistor--019-020You'll get the hang of the Oscope just as quickly as you have learned tube amp building.
Just keep at it and don't be afraid to experiment.
Grab one of those 100:1 (1000v) scope probes on EBay for testing HIgh voltage DCYour scope setting will now show 100X the setting and you'll be able to see ripple, not just measure. Most probes are 10:1 so you are somewhat limited.
Edits: 10/23/16 10/23/16 10/23/16
ok. thanks.
Loading the amp if that's what the output transformers are set up for. Also it should be higher in wattage rating than the output of the amp. Parts Express sells them.
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