TECHNO-INFORMATION:


For the benefit of anyone not yet familiar with the fact that there are also the same quirks that one experiences with the
" K-tran " style of ¾ inch I.F. transformer, also being present in some of the older, larger sized Zenith units.

Photo Referencing:





A. . . The top of the transformer. . ., it’s revealing the top of the cardboard coil form being somewhat dependent upon the
metal fold over in the top access adjustment hole, for centering / support of that coil form.


B… Shows the bottom of the transformer, with some short wire sprig-lets left intact for I.D .of the terminals and
particularly, the BLUE-RED reference indexing between terminals 1 and 8, which was also carried forward on
all of the associated mechanics inside the transformer, with use of a Blue Micro Tip Sharpie .

The crimps on the four sides of the bottom of the transformer hold the bottom fiberboard plate in place. Clipping one side
as shown, will leave tabs that can be swung outwards as shown and later be swung back in place to re-lock the bottom
square fiberboard plate in position.

Seems like those tabs tend to have a metal fatigue lifespan of 2 ¾ re bends, just in case you are needing a later accessing .


C. . . The view of the transformer proper, this is just about the point to make a drawing of the start /finish of the two coils
windings and the connections to their terminals on the fiberboard term disc. Unconnect all 4 wire ends and the coil will
then just lift out of the round brass clamp. Set the coil form aside for safety.


D. . . This is showing the blow-up of the disassembly of the bottom wafer, its terminals, the internal mica dielectric disc,
and the bottom round fiberboard disc/ pressure plate, round brass coil clamp, keyed brass screw and the clamping nut.


E. . . Removing the mica disc, reveals the contacts associative with its interfacing. This is also about the point where you
can observe that the inner "petals" are somewhat responsible for the creating of a support of the terminals that are passing
thru slots in the fiber disk. On a K’tran conversion one could gut all of the micas and still leave the terminals being well
supported
by the surround plastic molding. However, in this transformers terminal mechanical support situation, one needs to:


1. . . Re utilize a cleaned , de oxidized, inspected mica dielectric disc, . . . or


2. . .Clip the petals and micro-epoxy the terminals for support of the wiring side and opposite coil wire connection side of the
coils terminals. . .or

3. . . Replace the mica disc with an insulator / dielectric /spacer disc, then reassemble and ascertain the value of externally
installed silver micas required to resonate the coils at 455, with the internal slugs being positioned ≈ ½ of a slugs width outwards,
from its being centered within its coil.

F. . . This is a view of the mica element and its silver deposition areas. Check the blue /red index bar and find the terminal just
to its left at the top left corner of the pic and it will be terminal #1 and connects to the "petal" that is obscured by the mica insulator
but its connective area is the silvered area that is on the bottom side of the disc and is outlined in BLUE.
Just above that area the companion terminal 8 is connected and you can see its "petal" that is pressing down to the RED outlined
mark up.

Now look over to the right half of the disc and notice that the bottom. . . .obscured. . ."petals" are connecting to that YELLOW outlined
silvering that encompasses ≈ three quarters of the area of the bottom side of the disc.

Now, in looking topside at the right top hand corners "petal", one can see the MAGENTA outlining of its silvered contact area.

The last silvering is located at the very bottom of the pic and is shown as the GREEN outlining and contacts to its "petal" contactor.

.


G. . . Depicts a one time use of an insulator of drafting film for the replacement of a mica insulator.


H . . A side view of a re-clamped unit, only needing the coil assembly and its soldering of coil wires to its terminals.


J. . .Top side and bottom sides of the mica disc:


A superimposed / combinational infrared /x-ray photomicrograph :

The x-ray aspect being relevant to the thickness of the materiel-- the infrared aspect being relevant to the emissivity
when being heat flooded. Both are then being displaying out as shades of grey. Take particular note of the minute silver
traces present around the extreme periphery of the disc.

Actually, there was a minimal surfactal contact area being present !. . . .instead of the "petals" making a broad surface
contact area.

Thassit. . . .


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