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Triplett 3444
1959
Triplett Electrical Instrument
Company
Bluffton, Ohio USA
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The 3444
was one of the best midpriced tubetesters made in the USA.
Introduced in 1959, it competed directly with the Hickok 539 series
of tubetesters. The main attribute of the 3444 is the fact
that it has a maximum plate voltage of +250 volts while most other
tube testers, including the Hickoks, only have a maximum plate
voltage of around +125 volts. This higher voltage gives a more
accurate measurement for tubes being tested because the tester's
electrical conditions closely simulates a true working environment
for the tube to be tested in. Also this higher plate voltage
is more reliable in identifying faulty gaseous tubes. Another
great feature is the 5 kHz internal oscillator which is used to
inject a signal to the grid of a tube being tested. This
features offers a more realistic input signal condition then that of
the Hickok 539 series which only offer a 60 Hz input signal.
One other notable feature is the ability to test dual sectioned
tubes under one setup instead of two setups. Below are the
specks which are found in the Triplett 3444 owners manual. I
purchased this tube tester from the James McDonald auction which was
held at the 2004 IHRS/AWA 33rd Annual Regional Spring Meet,
Johanning Civic Center, Kokomo, Indiana. |
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Tube and
Rectifier Line Up:
6C4.....Oscillator
12AU7.....Meter
Amplifier
2 half wave rectifiers
2 full wave
rectifiers |
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Power
Source:
AC...117 Volts |
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Dimensions:
Height...7-3/4 inches
Width...18-3/16
inches
Depth...7-3/4 inches |
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Click here to
see Hickok's current homesite. |
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Triplett Instruction
Manual
Model 3444 Tube Analyzer
This owners manual covers the technical
data, theory of operation, installation and initial adjustments, the
controls, step by step operation instructions, precautions,
maintenance, cross reference to tube types, replaceable parts,
schematic diagram, and warranty. It measures 11 inches x 8 1/2
inches and containes 16 pages, excluding front and back
covers. Copyright 1959. Part No.
84-96-072861-4. |
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3444 Triplett
Roll
Chart Supplement
This tube supplement chart covers all
tubes that the roll chart doesn't cover, espicially older tubes such
as the 00A, 01A, 99, Western Electric tubes such as the 300B and
310A, and forign tubes such as the Rogers (Canada) 88M. It
measures 9 inches x 6 inches and containes 16 pages. Part No.
84-130-110167-12. |
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Technical
Data
Triplett Model 3444
Gm
SIGNAL POTENTIALS AND RANGES
Four direct reading Gm ranges
1.00001,000 micromhos
2.00003,000 micromhos
3.00010,000 micromhos
4.00030,000 micromhos
Four signal
potentials @ 5 kHz
1.0001,000
millivolts
2.0000,333
millivolts
3.0000,100
millivolts
4.00000,33
millivolts
SHORT
TEST
Filtered
DC, 85 volts. In accordance with EIA G-8 Committee
recommendations.
LEAKAGE
0 to 10 megaohms at 85 volts (measurements made
directly on the meter).
PLATE POTENTIALS AND CURRENT RANGES
Four DC plate
potentials.
1.000012
volts
2.000030
volts
3.000100
volts
4.000250
volts
Two DC
plate current ranges (can be used for plate current cut-off
measurements and grid current readings to determine cutt-off
point of tube).
1.00005 ma full scale
2.00050 ma full scale
BIAS
Two DC bias ranges (on 50 division dial
so that actual bias voltages can be read
directly).
1.00000 to
5 volts
2.0000 to
50 volts
SCREEN
POTENTIALS
Five DC screen potentials
1.000012 volts
2.000030 volts
3.000045 volts
4.000100 volts
5.000250 volts
FILAMENT VOLTAGES
Twenty-three AC voltages closely
regulated:
1.00000.63
volts
2.00001.25
volts
3.000001.4
volts
4.000002.0
volts
5.00002.35
volts
6.000002.8
volts
7.00003.15
volts
8.000004.2
volts
9.000004.7
volts
10.00005.0
volts
11.00006.3
volts
12.00007.5
volts
13.00008.4
volts
14.00009.5
volts
15.00010.5
volts
16.00012.6
volts
17.00016.8
volts
18.00018.9
volts
19.00026.0
volts
20.00035.0
volts
21.00050.0
volts
22.00070.0
volts
23.00117.0
volts
Gm
CIRCUIT CHECK
Self
checking GM circuit with 5 kHz signal source and vacuum tube
micrometer.
GRID
CURRENT
Grid
current test under operating conditions.
PLATE CUT-OFF
Cut-off measurement on voltage
amplifiers.
RECTIFIER TEST
Test
for rectifiers is made under load.
DUAL PURPOSE TUBES
Single element switching set up for dual
purpose tubes.
THYRATRON TEST
Firing
voltage grid current and cut-off measurements in
thyratrons.
SIGNAL
OSCILLATOR
Output
1.5 volts, 5000 cps.
METER
Rugged
200 micrometer, illuminated, with 4" scale length and knife
edge pointer.
NOISE
TEST
Noise
test jacks for checking noisy or intermittent
tubes.
TUBE
CHART
Roll
chart illuminated and removable.
SOCKETS
Combination 4-5-6 prong; combination 7 prong; octal;
loctal; 7 pin subminiature; 8 pin subminiature (round); 7 pin
miniature; 9 pin miniature; nuvister on serial number above
3,000; acorn adapter (supplied with analyzer - stored in roll
chart compartment). Octal, 7 pin miniature, 9 pin miniature
are socket-savers for easy replacement from the panel.
NOTE--The red dot on the panel next to the 7 pin subminiature
socket indicates pin No. 1. This usually is indicated on the
subminiature tube with a red dot.
PIN STRAIGHTENER DIES
7 pin and 9 pin straightener dies on
panel.
CASE
Wood,
gray leatherette covered, 15-3/16" x 18-13/16" x
7-3/4".
OVERLOAD
Red
bulb lights with excessive overload.
FUSE
3 amp,
250 volt, type 3AG in roll chart compartment.
Weight
24 pounds.
POWER
117 AC
volts, 50-60 cps.
ACCESSORIES
One
black grid cap or cathode cap lead, one red plate cap lead.
One acorn adapter. |
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This web page was last
updated: May 31, 2004
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