11
Cut two 14" (36 cm) lengths of
red
enamel-coated wire.
Cut two 4" (10 cm) lengths of
green
enamel-coated wire.
The first of T3's windings requires 21 turns of red enamel wire (see Figure 5a). Wind the turns as close
together as possible to leave room for the smaller winding.
Re-check the number of turns on T3's first winding.
Note:
when counting closely-spaced turns, it may
be helpful to use a pointer to keep track of where you are in the winding. A small flat-blade screwdriver or
tuning tool can be used for this purpose.
Re-check the winding sense (direction): lead 3 must terminate on the top side of the core, and lead 4
on the bottom.
Prepare the leads of the first winding as you did with the leads of L1-L6.
The second of T3's windings requires 3 turns of green enamel wire. Add this winding to T3, arranging
the turns exactly as shown in Figure 5a.
Re-check the turns count and sense of the second winding.
i
When you prepare the leads of the second winding, be careful not to damage or apply heat
to the first winding. This could result in a short between turns, altering the inductance.
Prepare the leads of the second winding.
Examine all four leads and nearby turns with the magnifying glass. Make sure that no adjacent turns or
leads are shorted or melted together.
Install T3 vertically as indicated by its component outline, near trimmer capacitor CE. Four numbered
pads are provided for T3 that correspond to the numbering shown in Figure 5a. Insert the leads into their
holes, then pull them taut on the bottom to hold the transformer in place. Solder and trim the leads.
Complete both of transformer T4's windings as indicated in Figure 5b. Note that T4 uses different
windings from T3: the larger (red) winding uses 22 turns, and the smaller (green) uses 2 turns.
Heat-strip and tin the leads of T4's two windings.
Re-check the number of turns and winding sense of both of T4's windings using Figure 5b
.
Install T4 vertically as indicated by its component outline, near trimmer capacitor CF. Make sure the
numbered leads are inserted into the correct pads. Solder and trim the leads.
