[Boatanchors] Question about swinging link output circuit

[Chris Howard]

I'm working on this old homebrew transmitter (been at it off and on for
a year!)

The PA has two 250TH tubes in push-pull.  The output circuit is a 
swinging link arrangement using a B&W HDVL plugin coil set.

Hanging under the B&W coil socket is a fitting.  The only things
I have that fit there are three rf-choke like coils, about 6 inches
long.  The three are different only in the number of turns.  Wire
size and coil size looks the same on all three.

According to my grid-dipper, having the choke there does not change the
resonance of the output circuit that I can tell.

I'm not 100% sure that those choke-like coils even fit in this
place.  Why would someone put such a thing in parallel to the
output plugin coil?  Does it make sense? 

You can see schematics here  (but I left out the choke in question
from the PA schematic)

https://users.frii.com/yipyap/twiki/bin/view/Main/TransmitterProject

Chris
w0ep
chris at yipyap.com