MIL
AN/PRM-10
I personally removed from the
MIL wrapping from my
AN/PRM-10,
new; it is among
the best of GDOs (a title shared with the
Measurements 59
and Millen 90662 'Industrial'
model).
90652s
are both (an original
and
a Caywood-made unit)
Mint-NIB;
plus I have several of
the 'regular' tube-type
90651 Millens-including
one Mint-NIB
unit. And a separate set of the VLF-MF
coils, in excellent condition,
w/data conversion
sheet. A recent acquisition is the
Industrial
model, the 90662.
This GDO
comes in a
special metal case,
with the VLF-MF
coils,
and a built-in tone modulator.
Despite describing itself as potentially "battery operated" the
90662
still uses a
single 9002 tube as its
oscillator-but adds a 2N175
to the 2N406 for
the tone modulator
and DC meter amplifier,
respectively. Finally,
I just acquired its
predecessor
Industrial model: the
90661.
Essentially, it's a
90651 with a
metal case
and the different designation. It has the
individually calibrated
coils, but no tone
modulator or DC meter amp, and no VLF-MF coils..
I also have
3
90600
Wavemeter sets-including
one that is
near-mint,
and the
Millen 90672
Antenna Bridge
w/all 4 coils in excellent
condition. An excellent source of
Millen
information may be found at:
MILLEN
. 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.
The
GDM-1
is another version of the "Midland Tr". Both obviously made by the same
manufacturer.
New
London Instrument Company Model 200 UHF Grid Dip Oscillator.
This unit just showed up on ebay-I had never even heard of it until
then.
NOVEX Grid Dip Meter - Model
DM-4061
in MINT condition. Frequency
range: 1.5 through 250 MHz (Six plug-in coils). This is the
excellent GDO model currently sold by
ALFA Electronics
(at a VERY good price).
PACO
Model G-15;
PACO was an
EICO
competitor, and is similar to the
EICO 710.
Quemont
Electronics GDM-3 Transistorized
dip meter with a range of 0.5 to
150 MHz, using 6 plug-in coils.
Identical to the
Midland/Thoro-Test
Series.
Radiometer
Copenhagen Model
GDO.1b;
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.
Savant
GDO Model DM-250 Tttransistorized
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.
Tech
model TE-15 is a later model of the
Midland/THORO-TEST
series of GDOs.
It features a three transistor circuit over the
one transistor of the original series. Looks practically identical.
Click for large picture.
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