[Amps] Input impedance question

[Dave M]

I am slowly putting together the parts for a 3 hole GI7BT amp ,GG and tuned pi network input , I have the PS and most of the RF deck parts acquired and am ready to design the tuned input , can anyone "ballpark" what I can expect to see at input? 

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And, like this insubstantial pageant faded, 
    Leave not a rack behind. We are such stuff 
    As dreams are made on, and our little life 
    Is rounded with a sleep.
 
 
Shakespeare : The Tempest
Prospero to Ferdinand Act IV scene 1