DRAKE TR7 Service Manual download pdf (Page 5)

Figure 4: Escutcheon mounted to panel with copper encoder mounting sheet

sandwiched between escutcheon and panel.

LED Details

I chose to use all five supported LEDs and those are:

1. RIT active

2. Lock active

3. VFO-A active

4. VFO-B active

5. Split active

Since I used the FIXED switches, I decided the current FIXED lamp was no longer needed, so I used

that position for the LOCK LED. For RIT, I replaced the current RIT lamp with an LED. For those

two LEDs, I used an LED with a diameter of about xxx”, which was close to the diameter of the

original lamp. I wrapped a couple of turns of Magic Mending tape around the LED body and that made

for a press fit into the old lamp housing. Note that there's no switch for turning on the RIT in the new

VFO. When the RIT pot is centered, the RIT LED will be out, but turning the RIT pot either direction

will cause the RIT LED to light. For these two LEDs, I used very bright LEDs that duplicate the

brilliance of the original lamps.

I mounted the other three LEDs in the old analogue dial window in the escutcheon, above the tuning

knob. The original blue plastic filter was removed and replaced with a piece of blank circuit board that

was trimmed to fit. The piece was then painted a semi-flat black to make it blend with the escutcheon.

Here I used miniature LEDs, which I epoxied into 1/16 inch holes drilled through the circuit board

piece. That assembly was then epoxied to the escutcheon.

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DRAKE TR7 Service Manual Page 5