Yes but for an rf power amplifier an output voltage change in the class of milivolts, even 0.5v may not be a trouble.
Leaving alone the small ripple depended on temperature or load changes (in class-A amplifiers load is constant), do you think the simple zener-transistor psu above is clean in terms of noise or not?
Dr Om,
I think: yes, as wrote too, but Nois clening?
Surely not better as your AC-input, also I would see over all for apply good bypassings_ Elkos + parallel Ceramics...
Maybe Zener voltage need a ceramics too?
Good luck!
73 de Karesz