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Original Message
I prefer a coupling cap to a cathode bypass cap
Posted by andy evans on February 27, 2017 at 07:53:29:
The problem with direct coupling is that you commonly end up using a cathode bypass cap on the second stage because of the larger cathode resistor.
Because I use DHTs like 26, 01A and 4P1L which can all be used in filament bias with no cathode bypass cap, I prefer using a small teflon coupling cap (or an interstage) to a large cathode bypass cap - however fancy it is.
As said, there's no free lunch. A cathode bypass capacitor is a capacitor, period.