today12/2/16 An audiogon member sent this ebay auction, higher selling price and in fair condition. You should be able o copy and paste it to a new page and see the condition. Yes, we did the rebuild and calibration, so electrically, this offered 3444 is the same. http://www.ebay.com/itm/TRIPLETT-3444-VACUUM-TUBE-TESTER-REBUILT-CAL-C-G-INDUSTRIES-THE-BEST-/262538516489
One of the finest tube analyzers ever made. Measure transconductance/gm and match plate current with high
repeatable precision. An opportunity to verify what you buy or sell, or
keep tabs on your tube and amplifier investments with total confidence
and no guessing. This rebuild and calibration is good for a minimum
10,000 hours of actual in-service testing use before any 'check-up'
should even be considered, that is about 20 years for most users. Your
tubes are tested in class 1A conditions as per tube manufacturers data
plate curve references.
Installed parts and labor are guaranteed for
one year. Specifications are at the end of this listing.
Note that there are two different Triplett 3444 being offered, please see each one. This one has a slightly better deck with Roman numerals just under the meter which is covered by the calibration sticker before shipment.
This is a very easy to operate machine, you set the dials according to the
numbers on the roll chart, verify the meter setting and after the tube
warms, and read your gm and direct plate current readings at the same
time. This is true plate current measured as a triode. Dual element
tubes such as 12xxx can be tested without changing any knobs as you must
do on Hickok and others.
If testing is new to you or you have years of experience, we prefer on line or
telephone support to get you going and demonstrate subtle details the manual
does not cover. We also provide a primer, a Cliff's Notes, that is easy to
understand. After the fact help is always available. Have some rare tube
and there is no set up for it, we will help create the set up values
Keep in mind that the 3444 can not test high power transmitter
tubes such as the 845 or 211, but nearly all other tubes it can test including the new KT150.
This TRIPLETT MODEL 3444 LABORATORY TUBE ANALYZER has been
completely rebuilt and calibrated to the exact original 25 page factory standards
calibration document and assembly master model. To the best of our knowledge,
no other service has this document. ALL testers are burn-in for over 72
hours and retested to re-verify calibration to 1% or less (Triplett
allows 3%) and adjusted as needed. The actual meter is tested for full
scale deflection at the given spec. The 'line' test calibration alone
takes up to THREE DAYS to resolve. The highest and finest grade
components were used including low current leakage capacitors, Vishay
military grade resistors, and new old stock tubes. We measure ALL actual
component values before insertion and use. It has a Triple calibration
verification before it leaves here.
The Condition of this 50 year old machine is remarkable (dated August 1964) and
private not commercial owned in the past. We invite you to examine the photos.
The meter is perfect, and deck face is near perfect, a very few very minor
blemishes here and there. It has seen so little use that the thumb roller on the
data bar shows no particular wear (this area to the side is usually
polished to bright aluminum as the user's thumb polishes away the
factory finish). Overall, this tester is in exceptional museum condition
for the age.
We have been in business since 1973 as C.G. Industries of Florida(email@example.com). We refurbish and
restore vacuum tube testers, modern and vintage tube equipment and
amplifiers, hot-rod and custom reworks included. We don't mess around
and are very serious about our services. Please check our Audiogon
feedback for members who have bought a tester from us or had their
tester serviced. On Ebay we are known as budngreg with a 16 year
history of 100% five star service strong.
Paypal to confirmed address only.
We will also accept checks which need to clear.
PayPal or credit cards OK, must be verified delivery address.
Why is this ANALYZER considered better than the Hickok tester series
(or Western Electric)? Answer: All Hickok tester are based on an early
1940's design. All Hickok testers use two tube based rectifiers, and
unless the pulsed DC from each side of each tube is always equal (near
impossible unless balancing circuits are installed which we have created
for Hickok testers) the differences are shown on the gm meter as a plus
or minus of actual gm tube value and the higher the bias setting the
worse is the error. Only the Hickok 539C attempted to correct this
problem. The Triplett 3444 has no issues like this. Hickok also used a
60hz power-line signal, the Triplett uses a 5000 Hz internal generated
signal. Many low end Hickoks' can damage frame grid tubes, the 3444 can
not. Most Hickok testers do not detect 'short' or leakage above 300,000
ohms and most use a neon bulb not a meter, the Triplett 3444 detects
from a zero ohm short to 20 million ohms leakage on the meter (we would
never use a power tube showing less than 2 million ohm leakage and most
Hickok will miss that altogether). Hickok have only 150 unfiltered
D.C.volts or less on the B+ plate and on a power tube it can be down to
120vdc, Triplett used 250 fully filtered D.C. volts. There is good
reason why industry, the military (Navy and Air Force) and government
agencies such as the FAA turned to the Triplett 3444 in the 1960's and
thereafter.This 3444 is likely the finest vacuum tube tester ever made.
Technical specifications for the Triplett Model 3444:
Gm SIGNAL POTENTIALS AND RANGES Four direct reading Gm ranges 1,000 micromhos 3,000 micromhos 10,000 micromhos 30,000 micromhos
Four signal potentials 5000Hz 1000 millivolts 333 millivolts 100 millivolts 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 filtered DC plate potentials. 12 volts 30 volts 100 volts 250 volts
PLATE CURRENT fully independent automatic digital able to measure up to 199.9ma, with separate power supply.
BIAS Two filtered DC bias ranges (on 50 division dial so that actual bias voltages can be read directly). 0 to 5 volts 0 to 50 volts.
SCREEN POTENTIALS Five filtered DC screen potentials 12 volts 30 volts 45 volts 100 volts 250 volts.
FILAMENT VOLTAGES Twenty-three AC voltages closely regulated: .63 volts 1.25 volts 1.4 volts 2.0 volts 2.35 volts 2.8 volts 3.15 volts 4.2 volts 4.7 volts 5.0 volts 6.3 volts 7.5 volts 8.4 volts 9.5 volts 10.5 volts 12.6 volts 16.8 volts 18.9 volts 26.0 volts 35.0 volts 50.0 volts 70.0 volts 117.0 volts.
Gm CIRCUIT CHECK Self checking GM circuit with 5 kHz signal source and vacuum tube micrometer.
GRID CURRENT aka GAS test Grid current test under operating conditions.
PLATE CUT-OFF Cut-off measurement on voltage amplifiers.RECTIFIER TEST Test for rectifiers emission is made under load.
DUAL PURPOSE TUBES Single element switching set up for dual purpose tubes, such as 12ax7.
THYRATRON TEST Firing voltage grid current and cut-off measurements in a thyratron.
SIGNAL OSCILLATOR Output 1.5 volts, 5000Hz.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; nuvistor.
PIN STRAIGHTENER DIES 9 pin straightener die on panel. CASE Wood, leatherette covered OVERLOAD Red bulb lights with excessive overload. FUSE 3 amp, 250 volt, type 3AG in roll chart compartment. Power 120 to 124 vac.
NOTE: IF YOU KNOW YOUR WALL POWER IS HIGHER THAN 124.5 AC, PLEASE TELL US SO WE CAN MODIFY AS NEEDED.