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Old 19th Oct 2017, 9:31 pm   #1
NickG0HIK
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Join Date: Jul 2010
Location: Ireleth-in-Furness, Cumbria, UK.
Posts: 144
Default What type of capacitor for R.F. decoupling ?

Hi,

I'm trying to rebuild an oldish receiver (1950's), all I have is a more or less bare chassis and the circuit diagram.
There are quite a lot of 1000pf decouplers, Cathode, Screen and heaters. Even though only the screen components will need to be H.V. I presume that they could well have used the same component throughout.

In my stock I have Mustard Polyesters (400v) and polystyrene's (not sure of their voltage rating), which or neither should I choose for use from 20 to 40 MHz ?
I see you can get R.F. ceramics, I presume that they have improved dielectric for lower loss. But they really don't look the part for the vintage of the kit.

Any recommendations and info would be great.

Thanks

Nick
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