look at my
CORROSION TOPICS page. Lots
unfortunate mistakes and cures. Complete with closeups!!!
the Models GD-1,
Deserving special mention is the
Heath GD1-B (1955) Special LF Version
his very rare
is in absolutely MINT
original shipping box, instruction
sheet, conversion scale, and Auxiliary Coil
Set 341-A for ranges:
700kc-1.9Mc (it'd be a shame to use
here, wouldn't it!); The optional
LF coils and chart cost $3.00
in 1954!!. The associated
$19.50. I also have the
HM-10A Tunnel Dipper:
one of the few (if not the
commercial Amateur Radio applications of the
Also included in my collection
is an assembled (by me)
MOSFET GDO; and an
kit as well as a complete
GD1-B (tube-type) GDO kit.
I also have two models of
the European version of the Heath
One-as seen at left-that is a medium grey, with white letters. The other
is a lighter grey, with dark letters. I believe this is the older unit.
These are 220V European-only models I got from England. Very similar to
the U.S. GD-Series, but a nicer design. Notice the EURO 220 VAC plug.
Heathkit GD-1 Series GDOs
GDOs are AC line powered instruments with a range of 2 to 30 MHz using
five coils; and having an available auxiliary 2-coil set extending the
unit down to 350 kHz. The American series uses a single
6AF4A vacuum tube.
European version, the
GD-1U, uses an
EC-92 / 6AB4. There are two
color schemes associated with the latter unit, and I have both. The
meter movement is 500 uA movement. The net weight of a GD-1B is 2 lbs or