[Amps] cathode return?

[Tom W8JI]

> I have seen designs for using such directly-heated cathode 
> tubes
> which simply attach the cathode common return to one of 
> the filament
> connections.  (The filament connections have multiple RF 
> bypass
> capacitors between them, and to ground.)
>
> What are the arguments for and against each of these 
> approaches to
> providing the "cathode return"?

There is no cookie-cutter answer.
Depending on filament voltage and other operating/bias 
voltages, you can get varying amounts of 60 cycle AC on the 
output.