I found two of these nippers between my stuff today while cleaning out drawers. They are Siemens styroflex caps, 200000 pF, 500V. Two caps in parallel with a small bypass cap in the center. I see some guy's like to install monstrous caps on the input of an amp, maybe I should try it sometime !😀
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Nothing to do with "monstrous " but everything to do with Polystyrene which they are made out of .
I like polystyrene but the big drawback is the size of even small values like = 0.2uF they would not be cheap as the price nowadays has shot through the roof .
I used to buy 100pf for 5p now you are talking a £1 and as you can see the high voltage versions are large.
They look like they are for use in a commercial power circuit as Siemens
supplies electricity utility companies as well as the public .
I like polystyrene but the big drawback is the size of even small values like = 0.2uF they would not be cheap as the price nowadays has shot through the roof .
I used to buy 100pf for 5p now you are talking a £1 and as you can see the high voltage versions are large.
They look like they are for use in a commercial power circuit as Siemens
supplies electricity utility companies as well as the public .
Large input capacitor increases the risk of hum pick up from the surroundings, standard polypropylene would be superior in every important respect in that position.
PS are great performers, but PP are better for most things. If you have a high Q resonant analog filter to build, these PS caps might be just the thing (in lower voltage and smaller size!).