I am designing a tube based microphone pre-amplifier. At present I am
trying to sort out the HT supply topology. I would prefer a simple RC
network but this reduces the anode volts available to the first stage. I
want to avoid 'anode starvation' and it attendant colouration so my
question is below what voltage would the anode be considered to be
'starved'? The preamp uses 6AU6 tubes.

Cheers

ian