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"few hundreds of mA, max."

Or way less, the current requirements of a bias supply is basically nothing, it is just a voltage reference. Michael was thinking you were asking about the idle current of the output tubes.

More power to you trying a choke, however using a choke for a bias supply is not really needed. Most amps use a half wave rectification an are dead quiet as there is no current demand. If you want to play with one, you should try a 5 to 10 mA 50 Henry or higher. I would go CRCL with the choke at the end like a grid choke. You are going to want to make part of the R a variable resistor to set the right voltage. Be careful where you put the choke as it can pick up radiated noise. The "best" supply for a bias would be one using a full wave bridge, but that usually requires a separate power transformer for the 50 v secondary.

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