Elecraft KX1 Manual - Manual (Page 54)

E
LECRAFT 53
Check your kit to determine whether a 2SC2166 (metal tab) or a
2SC5739 (black plastic tab) transistor was supplied. Both transistors
provide equal performance, but their installation is different because
the metal tab on the 2SC2166 must be insulated from the mounting
hardware. Install the transistor exactly as described in the following
steps.
Bend Q6’s leads into a gentle 90-degree curve (see Figure 24).
Note that the flat side of the transistor faces away from the circuit
board. Wrapping the leads around a round screwdriver shaft or drill
bit helps avoid sharp kinks in the bend.
Locate the silk-screened outline for Q6 at the top edge of the
circuit board. Install the 3/16” (4.76 mm) standoff on the circuit board
using a 3/16” pan head screw and two split washers as shown in the
figure. The split washer under the standoff is important to reach
the proper height so Q6 will come in contact with the cover. Be
sure the screw head or washer is not touching the windings on L3 on
the bottom of the board. They may touch the toroid core in the space
between the windings.
Place Q6’s leads in the holes in the circuit board. Do not solder
them until instructed to do so.
Figure 24. Installing Power Amplifier Q6.