There are 2 typical ways to drive an 8877 tube along with bias. There is
the method where the bias is fed through an RF choke to the cathode and the
RF is fed though the block cap to the cathode. In this case some designers
do not use a filament choke. Sometimes some do however. Then there is
the other method of connecting the cathode to one side of the filament,
filament voltage then must be fed through a filament choke and the bias is
applied to one leg of the filament voltage before the filament choke. The RF
is then fed through the block cap to the cathode/filament junction. Some
designers seem to prefer one way over the other depending on who it might
be. Question is, does there seem to be any advantage one over the other?
Obviously both methods work but just wondering the thoughts on one way over the
other. Anybody have their preference? Thanks Lou
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