BQ041-22803 FUSE LAMP
8V 100 ma lamp fuse
The Yaesu FT-747 and FT-757
Ft-757GX FT-757GXII radios employ a protection lamp on the input of the
receiver section. This fuse is easily accessible by simply removing the
bottom cover. It can be soldered to the existing leads without removing
the RF board.
If any damaging voltage finds its way into the radio, the little grain
of wheat bulb will open and save the front end of the receiver.
Sometimes these bulbs open during electrical storms, even when the radio is
Static charges can build
up on a wire antenna and that can open this fuse. I have found
that its a good idea to disconnect the antenna from the radio when its
not in use.
The Yaesu part
number BQ041-22803 for these lamps, was discontinued long ago. The 757GXII owners
manual specifies the part as an 8V 100 ma lamp fuse. I found some 8V 100 ma axial lamps
that meet the specification, but the axial form factor is
not ideal in this application.
As noted on several websites,
any low current, grain of wheat type lamp, from 6 to 8
volts, is a suitable replacement, so long as it is not rated
at more than 100 ma. These are not easy to find. If you do
find one you end up paying a lot more for shipping than the bulbs are
I found some grain of wheat
6.5V / 68mA bulbs
that fit the bill for use as fuses and are just the right size.
I have extras
If you need a replacement fuse bulb, contact me
I'll send you (2) for $8.25 postpaid while my supply lasts.
bulbs I have work well as fuses
but they are under-rated for use in illuminating the S-meter, etc.
Bill Patton, WY3AWest Chester, PA