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| Since I am an old fart and don't know anything http://www.dcaudiodiy.com/phpBB3/viewtopic.php?f=5&t=1598 |
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| Author: | Pelliott321 [ March 30th, 2020, 5:55 am ] |
| Post subject: | Since I am an old fart and don't know anything |
I found this YouTube very interesting https://youtu.be/BnR_DLd1PDI I hope I did not waste your time |
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| Author: | ratbagp [ March 30th, 2020, 8:43 am ] |
| Post subject: | Re: Since I am an old fart and don't know anything |
I did not waste my time. I will have to try this sometime. His collection of test equipment was astonishing. Why would he need all that stuff? ray |
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| Author: | brombo [ March 30th, 2020, 8:46 am ] |
| Post subject: | Re: Since I am an old fart and don't know anything |
I think he collects old test equipment. I saw a Tektronix 555 scope which goes back to the 1960's. Nowadays a scope, spectrum analyzer, etc. is something you plug into the usb port on your laptop. |
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| Author: | Pelliott321 [ March 30th, 2020, 8:48 am ] |
| Post subject: | Re: Since I am an old fart and don't know anything |
im thinking its not real, something virtual anyway he is a interesting watch |
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| Author: | ratbagp [ March 30th, 2020, 8:49 am ] |
| Post subject: | Re: Since I am an old fart and don't know anything |
Are there any recommendations for such a usb device? Just sufficient for basic tube stuff and to do a similar test on a capacitor? ray |
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| Author: | brombo [ March 30th, 2020, 8:54 am ] |
| Post subject: | Re: Since I am an old fart and don't know anything |
Here are a bunch of them - https://www.amazon.com/usb-oscilloscope/s?k=usb+oscilloscope&page=3 |
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| Author: | SoundMods [ March 30th, 2020, 11:34 am ] |
| Post subject: | Re: Since I am an old fart and don't know anything |
This is what pisses me off about internet information. Film capacitors are inherently non-polar as they are NOT electrolytics in that they do not have a formed dielectric. They are essentially a classic (legacy if you will) capacitor dating from the first experimental Leyden jars -- having a dielectric such as paper or plastic creating a "sandwich" between metal plates. Metalized film have the "plates" coated on the dielectric material that is wrapped. That striped-mark on many film capacitors simply indicates the outer-most wrap. Some will say that capacitor orientation in a signal path can make a difference. Maybe if the cap is a shunt to ground -- the cap then has a built-in shield. |
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| Author: | Pelliott321 [ March 30th, 2020, 12:17 pm ] |
| Post subject: | Re: Since I am an old fart and don't know anything |
that is exactly what the guy said and he demoed that with an oscope I it might make a difference to have the outer wrap on the low impedance side for noise reduction |
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| Author: | SoundMods [ March 30th, 2020, 2:17 pm ] |
| Post subject: | Re: Since I am an old fart and don't know anything |
Pelliott321 wrote: that is exactly what the guy said and he demoed that with an oscope I it might make a difference to have the outer wrap on the low impedance side for noise reduction The point I was making is that film caps are not polarized and that making that comment is very misleading. And what would be the low impedance side? Plate or grid? Hmmm. |
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| Author: | Pelliott321 [ March 30th, 2020, 3:27 pm ] |
| Post subject: | Re: Since I am an old fart and don't know anything |
He said the plate side |
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