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In Reply to: RE: Question... posted by Jim McShane on February 17, 2017 at 08:00:30
For coupling capacitors, the outer foil should go to the grid. This way it is statically grounded through grid leak resistor, and provides electrostatic shield for the whole capacitor. On many old caps there is a marking indicating the outer foil, so that a cap could be connected the right way.
I tried connecting caps both ways, and there wasn't much difference.
Follow Ups:
Ummm, I don't agree...
The proper way to connect the outside foil is to the low impedance side of the circuit. That is (in the case of coupling caps) usually the plate of the prior stage. The grid is a high to very high impedance point in the circuit - which will cause a noise voltage to be generated.
In many circuits the orientation is a non-issue but if it is go to the lowest impedance.
If you'd like to hear from a real expert follow the link below to Randall Aiken's site page. He explains WHY this is the best choice. It's excellent reading and he knows his stuff BIG TIME!!
nt
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