are both (an original
a Caywood-made unit)
plus I have several of
the 'regular' tube-type
unit. And a separate set of the VLF-MF
coils, in excellent condition,
sheet. A recent acquisition is the
model, the 90662.
comes in a
special metal case,
with the VLF-MF
and a built-in tone modulator.
Despite describing itself as potentially "battery operated" the
still uses a
single 9002 tube as its
oscillator-but adds a 2N175
to the 2N406 for
the tone modulator
and DC meter amplifier,
I just acquired its
Industrial model: the
Essentially, it's a
90651 with a
and the different designation. It has the
coils, but no tone
modulator or DC meter amp, and no VLF-MF coils. Also part of my
collection is Millen
and Millen 90662-A
With the latter
90662-A GDO, I now have
every GDO model Millen ever made.
I also have
one that is
w/all 4 coils in excellent
condition. An excellent source of
information may be found at:
. Click on the
James Millen MFG
banner above, to get to my very incomplete Millen
GDOs page-it DOES have both JPG and PDF versions of the
LF Coils Frequency Conversion Chart.
is another version of the "Midland Tr". Both obviously made by the same
London Instrument Company Model 200 UHF Grid Dip Oscillator.
This unit just showed up on ebay-I had never even heard of it until
NOVEX Grid Dip Meter - Model
in MINT condition. Frequency
range: 1.5 through 250 MHz (Six plug-in coils). This is the
excellent GDO model currently sold by
(at a VERY good price).
PACO was an
competitor, and is similar to the
Electronics Model DM-201; PEL was
small electronics manufacturer that I
believe existed in the early 1960s. This unit has 2 socketed Germanium
transistors, and I have all the coils. A very rare unit.
Electronics GDM-3 Transistorized
dip meter with a range of 0.5 to
150 MHz, using 6 plug-in coils.
Identical to the
European made, distributed in
Canada, this is a
very well made, AC-powered
GDO, covering 2 - 220 MHz.
Condition of mine is very good-to-excellent.
GDO Model DM-250 is a transistorized
dip meter with a 1.5 to 250 MHz
range, using 6 plug-in coils.
The unit strongly resembles the Lowe FX-1, and-like most solid state
GDOs-uses one 9 VDC battery.
model TE-15 is a later model of the
series of GDOs.
It features a three transistor circuit over the
one transistor of the original series. Looks practically identical.
Click for larger picture.
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