[Amps] Plate choke resonanse and safe operation

[OZ1AXG Flam]

Hi

Just replaced the plate choke in my ameritron amplifier.

I checked the choke resonanse, with a dip meter, and found resonans at:
fo = 27.711 MHz
fo = 15.265 MHz
fo = 10.839 MHz

Qustion is: how close is it safe to operate the ampfiler to the above 
frequences ?

Plate Choke is RFC-3 from RFParts:
http://www.rfparts.com/choke.html

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vy 73 de OZ1AXG Flam