[Milsurplus] GRC-9 Transmitter

[Richard Brunner]

W2AGN said:

"> Anyone have a hint on getting at that doubler coil? "

To use the vernacular, "It ain't easy."  See my article, "GRC-9 Operating
Notes," in Electric Radio, Nr. 108, April 1998.  Briefly, to remove T104:
1.  Remove all tubes and put them in a safe place.
2.  Remove the VFO tuning knob and condenser.
3.  Unsolder the small RFC from the tank coil.
4.  Unscrew the standoff insulator from the corner of the T104 can.
5.  Unbolt the 2E22 shield.
6.  Push the above components aside to provide "Wiggle Space."
7.  Remove 4 nuts attaching T104 to the chassis.
8.  Remove screw on the side of can T104.
9.  Run the tuning slugs all the way down. This is necessary due to an
interference between the slugs and the top mounting    screws if the slugs
are up when you try to remove the coils in step 11.
10.  Pull the can up a bit to allow wiggle space, and remove (6) coil
mounting nuts
11.  Push the coil mounting screws inside the can, and gently wiggle it out
12.  Replace C114 while you're in there.
Reassembly:
13.  Make sure the coil mounting screws are tight and will not rotate.
14.  For re-assembly, make three thin 3/8" ID paper tubes to guide the slugs
back into the coils.  They may be removed later from the bottom, and if left
in place will do no harm.
15. Put the can onto the coils with the guidance tubes, wiggle into place on
the chassis and attach with (4) nuts.
16.  Wiggle the coils to get the mounting bolts through the mounting holes.
Put nuts on the top bolts only, as the bottom bolts are too inaccessible.
Scrunch a length of solder onto a nut to hold it, and thread onto the bolt
with a small screwdriver.  Tighten with a wrench.
17.  Line-up the bracket supporting C114 inside T104, and attach with a
screw in the side of the can.  A length of wire with a small hook on the
end, used to line it up and to prevent turning, is a big help.
18.  Retrace steps 1 through 5.
19.  Re-tune the transmitter driver stage.

Having done this once, it doesn't look so formidable now.

GL
Richard Brunner, AA1P