[RadioSvit]

Michael, I think that the choke L11 is used to increase the reactive resistance of the anode load for the lamp of the input stage due to its high internal resistance, because as you know, the inter-stage transformer needs a more powerful driver tube than the one used in this radio. In my opinion, the frequency response correction function is secondary here.
PS... I hope that Google will translate it correctly and you will understand what I want to say