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Since I am an old fart and don't know anything
Posted: March 30th, 2020, 5:55 am
by Pelliott321
I found this YouTube very interesting
https://youtu.be/BnR_DLd1PDII hope I did not waste your time
Re: Since I am an old fart and don't know anything
Posted: March 30th, 2020, 8:43 am
by ratbagp
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
Re: Since I am an old fart and don't know anything
Posted: March 30th, 2020, 8:46 am
by brombo
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.
Re: Since I am an old fart and don't know anything
Posted: March 30th, 2020, 8:48 am
by Pelliott321
im thinking its not real, something virtual
anyway he is a interesting watch
Re: Since I am an old fart and don't know anything
Posted: March 30th, 2020, 8:49 am
by ratbagp
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
Re: Since I am an old fart and don't know anything
Posted: March 30th, 2020, 8:54 am
by brombo
Re: Since I am an old fart and don't know anything
Posted: March 30th, 2020, 11:34 am
by SoundMods
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.
Re: Since I am an old fart and don't know anything
Posted: March 30th, 2020, 12:17 pm
by Pelliott321
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
Re: Since I am an old fart and don't know anything
Posted: March 30th, 2020, 2:17 pm
by SoundMods
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.
Re: Since I am an old fart and don't know anything
Posted: March 30th, 2020, 3:27 pm
by Pelliott321
He said the plate side