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What a great link, Wayne! For me, it's a refresher course as well as a lot of "....hmmm learned something new today"
Interesting coincidence, but in the past week or so I discovered a new line of TDK branded MLCC C0G/NPO caps in axial/thru-hole packages at Mouser. I just messed with the Mouser filters, and they stock up to 0.22 uF ($1.32 in singles, 5 mm lead spacing, which is kinda small for that amount of uF).
Reading about C0G caps in audio applications ( see John Hardy's website and elsewhere) I tend to no longer hate ceramics...LOL.
Bri
Professional audio and video systems design/installation/maintenance. www.BrianRoth.com
I love polystyrene and used piles of them in my kit company back in the 70's -80's, but they were not robust enough for large scale manufacturing processes.
NPO/COG ceramic will be suitably neutral (linear) and more robust.
JR
Cancel the "cancel culture", do not support mob hatred.
The polystyrene sound good. The low band needs a 4.7uf and a 3.3 nf All Electronics has some large values for cheap. I got 100pcs of 5000pf for $7.50. Two in parallel and one in series gets me to 3.333nf. I actually got 200 pcs and hand selected to nail the absolute value. I never would have figured that out without the handy Electronic Toolbox Pro.